Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • DKFZ Publication Database  (5,582)
  • Journal article published  (5,582)
  • Germany  (4,152)
  • CELL  (2,035)
  • PROTEIN  (1,920)
  • GENES  (1,077)
Collection
  • DKFZ Publication Database  (5,582)
Keywords
  • 1
    Keywords: PROTEIN ; MICE ; ACTIVATION ; PROGRESSION ; inactivation ; NEPHROPATHY ; 2 PARTS ; MANNOSE-BINDING LECTIN ; VASCULAR COMPLICATIONS ; CD59
    Abstract: Coagulation and complement regulators belong to two interactive systems constituting emerging mechanisms of diabetic nephropathy. Thrombomodulin (TM) regulates both coagulation and complement activation, in part through discrete domains. TM's lectin like domain dampens complement activation, while its EGF-like domains independently enhance activation of the anti-coagulant and cytoprotective serine protease protein C (PC). A protective effect of activated PC in diabetic nephropathy is established. We hypothesised that TM controls diabetic nephropathy independent of PC through its lectin-like domain by regulating complement. Diabetic nephropathy was analysed in mice lacking TM's lectin-like domain (TMLeD/LeD) and controls (TMwt/wt). Albuminuria (290 mug/mg vs. 166 mug/mg, p=0.03) and other indices of experimental diabetic nephropathy were aggravated in diabetic TMLeD/LeD mice. Complement deposition (C3 and C5b-9) was markedly increased in glomeruli of diabetic TMLeD/LeD mice. Complement inhibition with enoxaparin ameliorated diabetic nephropathy in TMLeD/LeD mice (e.g. albuminuria 85 mug/mg vs. 290 mug/mg, p〈0.001). In vitro TM's lectin-like domain cell-autonomously prevented glucose-induced complement activation on endothelial cells and - notably - on podocytes. Podocyte injury, which was enhanced in diabetic TMLeD/LeD mice, was reduced following complement inhibition with enoxaparin. The current study identifies a novel mechanism regulating complement activation in diabetic nephropathy. TM's lectin-like domain constrains glucose-induced complement activation on endothelial cells and podocytes and ameliorates albuminuria and glomerular damage in mice.
    Type of Publication: Journal article published
    PubMed ID: 23014597
    Signatur Availability
    BibTip Others were also interested in ...
  • 2
    Keywords: RECEPTOR ; SPECTRA ; ANGIOGENESIS ; CANCER ; GROWTH ; GROWTH-FACTOR ; IN-VITRO ; INHIBITOR ; proliferation ; SURVIVAL ; tumor ; ADVANCED SOLID TUMORS ; AGENTS ; ANGIOSTATIN ; BLOOD ; carcinoma ; CELL ; CELL LUNG-CANCER ; CELL-PROLIFERATION ; CLINICAL-TRIAL ; COMBINATION ; DOPPLER ; ENDOTHELIAL GROWTH-FACTOR ; evaluation ; FACTOR RECEPTOR ; Germany ; human ; IN-VIVO ; INHIBITION ; KINASE ; LUNG ; MICROSCOPY ; MICROVESSEL DENSITY ; MODEL ; MODELS ; neoplasms ; PATHWAY ; PATHWAYS ; PERFUSION ; PHASE-I ; PROSTATE ; RECOMBINANT HUMAN ENDOSTATIN ; THERAPY ; TOXICITY ; tumor growth ; TYROSINE KINASE ; VITRO ; VIVO
    Abstract: The multifaceted nature of the angiogenic process in malignant neoplasms suggests that protocols that combine antiangiogenic agents may be more effective than single-agent therapies. However it is unclear which combination of agents would be most efficacious and will have the highest degree of synergistic activity while maintaining low overall toxicity. Here we investigate the concept of combining a "direct" angiogenesis inhibitor (endostatin) with an "indirect" antiangiogenic compound [SU5416, a vascular endothelial growth factor receptor 2 (VEGFR2) receptor tyrosine kinase (RTK) inhibitor]. These angiogenic agents were more effective in combination than when used alone in vitro (endothelial cell proliferation, survival, migration/invasion, and tube formation tests) and in vivo. The combination of SU5416 and low-dose endostatin further reduced tumor growth versus monotherapy in human prostate (M), lung (A459), and glioma (U87) xenograft models, and reduced functional microvessel density, tumor microcirculation, and blood perfusion as detected by intravital microscopy and contrast-enhanced Doppler ultrasound. One plausible explanation for the efficacious combination could be that, whereas SU5416 specifically inhibits vascular endothelial growth factor signaling, low-dose endostatin is able to inhibit a broader spectrum of diverse angiogenic pathways directly in the endothelium. The direct antiangiogenic agent might be able to suppress alternative angiogenic pathways up-regulated by the tumor in response to the indirect, specific pathway inhibition. For future clinical evaluation of the concept, a variety of agents with similar mechanistic properties could be tested
    Type of Publication: Journal article published
    PubMed ID: 14695206
    Signatur Availability
    BibTip Others were also interested in ...
  • 3
    Keywords: measurement ; CANCER ; proliferation ; Germany ; LUNG ; THERAPY ; ALGORITHM ; ALGORITHMS ; ANATOMICAL MODEL ; AUTOMATIC DETECTION ; BAYESIAN-ANALYSIS ; cancer screening ; chest ; CLASSIFICATION ; COMMON ; computed tomography (CT),image processing ; computers,diagnostic aid ; computers,neural networks ; CT ; DENSITY ; DIAGNOSIS ; EMPHYSEMA ; FOLLOW-UP ; follow-up studies ; GENERATION ; GROUND-GLASS OPACITIES ; HIGH-RESOLUTION CT ; IMAGES ; imaging ; INFORMATION ; lung cancer ; LUNG-CANCER ; MASK ; MULTIPLE NEURAL-NETWORKS ; NETWORK ; NETWORKS ; neural networks ; QUANTIFICATION ; screening ; segmentation ; SOLITARY PULMONARY NODULES ; SPIRAL CT ; SUPPORT ; SYSTEM ; SYSTEMS ; thorax ; TOMOGRAPHY IMAGES ; TOOL ; TOTAL LUNG CAPACITY ; VENTILATION ; VISUALIZATION ; VOLUME
    Abstract: The proliferation of digital data sets and the increasing amount of images, e.g. through the use of multislice spiral CT or multiple follow-up examinations in the context of new therapies, are ideal prerequisites for computer-aided diagnosis (CAD) in chest radiology. Multiple studies have described the applications and advantages of computer assistance in performing different diagnostic tasks. More powerful computers will enable the introduction of these systems into the clinical routine and could provide an enormous increase in morphological and functional information. The commercial introduction of tools for detection and visualization of pulmonary nodules has already begun. This is one of the most widely-reported applications in view of the ongoing studies on lung cancer screening. The next generation of tools will improve the diagnosis of emphysema through detection, quantification and classification. Many more uses are being developed, for instance the detection and classification of infiltrates, volume measurements or functional pulmonary imaging (e.g. dynamic ventilation CT or (3)Helium-MRI). Grossly simplified, most systems use a three level structure consisting of segmentation/feature extraction, classification of extracted features and an output unit. The output can be mere visualization through color-coding, volume measurements or calculated probabilities. The output supports the radiologist in establishing his findings and preparing differential and final diagnoses as well as providing quantitative data for follow-up studies. Different techniques are used for segmentation of lung areas as the basis for a variety of applications. Some commonly-used techniques for this and other tasks are density masks and threshold-based algorithms. Data processing is predominantly carried out with Bayesian classifiers or neural networks. This article describes the current status of research and provides insight into the common schemes and capabilities of the systems. It focuses particularly on common topics such as segmentation, volume measurement, detection of pulmonary nodules, quantification of emphysema and analysis of ground glass opacities
    Type of Publication: Journal article published
    PubMed ID: 14610697
    Signatur Availability
    BibTip Others were also interested in ...
  • 4
    Keywords: CANCER ; Germany ; LUNG ; lung cancer ; LUNG-CANCER ; SYSTEM ; CANCER MORTALITY ; COHORT ; cohort studies ; cohort study ; cohort-studies ; DEATH ; DISEASE ; DISEASES ; DNA adducts ; EPIDEMIOLOGY ; EXPOSURE ; HEPATOCELLULAR-CARCINOMA ; HISTORY ; incidence ; iron foundry ; larynx ; liver ; LONG-TERM ; missing death certificates ; MORTALITY ; mouth ; NEW-YORK ; occupation ; PHARYNX ; POPULATION ; PRIMARY LIVER-CANCER ; RISK ; RISKS ; SITE ; SITES ; WORKERS
    Abstract: Background Observations of an increased incidence of cancers of the upper aero-digestive tract (pharynx, esophagus, larynx, lung) among workers of local German foundries gave rise to concern about a potentially elevated occupational risk of those cancer sites. The purpose of the study was to examine whether occupational exposure in iron foundries increases the risk of cancer. Methods A historical cohort study of 17,708 male German production workers in 37 iron foundries who were first employed in 1950-1985 with a minimum employment period of 1 year was initiated. Employment and occupational histories were collected. Mortality was compared with that of the German general population during 1950-1993 using a new method for computing the SMR when not all causes of death are available (called SMR*). Results Mortality from all causes was elevated to SMR = 115.4 (95% confidence interval (CI) = 111.9-119.1), as was for total cancer (SMR* = 123.8, CI = 102.1-152.6), especially cancers of the lung (SMR* = 163.9, CI = 123.9-223.0) and liver (SMR* = 322.5, CI = 149.5-844.8), and diseases of the respiratory system (SMR* = 147.6, CI = 100.4-221.5). Non- significant elevations of mortality were also found for cancers of the mouth and pharynx (SMR* = 153.5, CI = 82.3-359.8) and larynx (SMR* = 173.1, CI = 85.5-550.5). Mortality from various causes of death was higher among workers with shorter exposure periods than among long-term employees. The elevated mortality persisted for years and decades after termination of employment. Conclusions The results provide further evidence for an increased risk of lung cancer and possibly other cancers of the upper aero-digestive tract among foundry workers. Special attention should be paid to the strongly increased mortality from liver cancer and the mortality pattern among employees having terminated work. (C) 2003 Wiley-Liss, Inc
    Type of Publication: Journal article published
    PubMed ID: 12594777
    Signatur Availability
    BibTip Others were also interested in ...
  • 5
    Keywords: DOPPLER ; Germany ; IN-VIVO ; MODEL ; MODELS ; CT ; VOLUME ; NEW-YORK ; ACCURACY ; computed tomography ; HEART ; INTEROBSERVER VARIABILITY ; PIGS ; RESOLUTION ; SURGERY ; validation
    Abstract: Background. Cardiac functional assessment represents the basis for diagnostics and cardiac operation planning. Spiral computed tomography (CT) combines the advantages of three-dimensional imaging and high temporal resolution when using gating techniques. However, in vivo validation data of this novel imaging technology are lacking. The purpose of this study was to validate in vivo the new imaging method using retrospective gating and to evaluate the clinical usefulness of the achieved temporal resolution. Methods. In domestic pigs (n = 10, weight 35 to 40 kg) a flowmeter was placed surgically on the ascending aorta. Flow velocity integrated over systole served as the gold standard for left ventricular (LV) stroke volume (LVSV-FM). CT signal, projection data, pacemaker signal, and flow velocity were recorded simultaneously at constant heart rate (pacemaker, 90 beats per minute). End-systolic and end-diastolic frames were calculated by retrospective gating. LV volumes were traced, the difference representing CT stroke volume (LVSV-CT). Image data were three-dimensionally reconstructed using ray- tracing. Results. Temporal resolution was 170 ms. Correlation of stroke volumes was high (r = 0.94, mean difference 1.75 mL). Intraobserver (0.49 mL, for LVEDV, 0.31 for LVESV) and interobserver variability (p = 0.21 and p = 0.06, respectively) were low. Postprocessing resulted in four-dimensional beating- heart models useful for operation planning. Conclusions. Spiral CT using retrospective gating was validated in vivo. Clinically acceptable temporal resolution and accuracy in determining cardiac stroke volumes were found. As a true volumetric imaging modality the method may now play an important role in computer- assisted diagnostics and surgery. (C) 2003 by The Society of Thoracic Surgeons
    Type of Publication: Journal article published
    PubMed ID: 12645712
    Signatur Availability
    BibTip Others were also interested in ...
  • 6
    Keywords: CELLS ; EXPRESSION ; CELL ; Germany ; PATHWAY ; PATHWAYS ; ACETATE-NONUTILIZING MUTANTS ; CDNA ; CDNA CLONES ; CLONES ; CLONING ; CRASSA ; DISTINCT ; DNA-microarray analysis,transcriptional profiling,correspondence analysis,acetate metabolism,Neurosp ; ENZYMES ; FILAMENTOUS FUNGUS ; GENE ; GENE-EXPRESSION ; GENES ; GENOME ; GENOME SEQUENCE ; HYBRIDIZATION ; microarray ; NMT1 ; PROTEIN ; PROTEINS ; RNA ; SACCHAROMYCES-CEREVISIAE ; SAMPLE ; SAMPLES ; transcription
    Abstract: Nutrient-dependent variations in transcript levels of the filamentous fungus Neurospora crassa were studied on a microarray containing some 4700 cDNAs. Cells were grown in minimal and acetate medium. The isolated RNA was analyzed in comparison to the results obtained upon the hybridization of samples prepared from the RNA of cells grown in full medium. Altogether, 160 cDNA clones exhibited significant variations, falling into five distinct subgroups of very similar transcription profiles. This is indicative of the occurrence of a high degree of co-regulation of genes in N. crassa. Especially the regulation of the expression of proteins involved in metabolic pathways was found to be strongly regulated at the RNA level. (C) 2003 Elsevier Inc. All rights reserved
    Type of Publication: Journal article published
    PubMed ID: 14599890
    Signatur Availability
    BibTip Others were also interested in ...
  • 7
    Keywords: CELLS ; tumor ; CELL ; Germany ; MICROSCOPY ; DIAGNOSIS ; NEW-YORK ; PROTEIN ; PROTEINS ; ADHESION MOLECULES ; cell line ; COMPONENTS ; CONSTITUTIVE TRANSMEMBRANE GLYCOPROTEIN ; CULTURED-CELLS ; DESMOCOLLIN ; desmoplakin ; desmosome ; DIFFERENTIATION ; EPITHELIA ; HUMAN PLAKOGLOBIN ; INTERMEDIATE-SIZED FILAMENTS ; meninges,meningioma,desmosome,desmocollin 3 ; meningioma ; MOLECULAR CHARACTERIZATION ; MOLECULES ; MONOCLONAL-ANTIBODY ; MR-165000 DESMOGLEIN ; NON-EPIDERMAL DESMOSOMES ; PLAQUE PROTEIN ; SUBDURAL SPACE ; TISSUE ; TUMORS
    Abstract: Intercellular junctions morphologically identical to epithelial desmosomes are known structures in meningiomas and arachnoidal tissue. Desmoplakin as one of the desmosomal plaque components has proven to be a reliable marker for diagnosis of meningeal tumors. Here we demonstrate by immunofluorescence microscopy, immunoblot and reverse transcription-PCR reactions that cells of arachnoidal tissue, of diverse meningioma subtypes and of a meningioma-derived cell line contain the full complement of the typical desmosomal proteins desmoplakin (DP), plakophilin 2 (PP2), desmocollin 2 (Dsc2) and desmoglein 2 (Dsg2). Consequently, all these molecules are suitable for diagnostic applications of meningioma tumors. In addition to these constitutive desmosomal components, representative for single-layered (simple) epithelia, the dural border cells of the arachnoid and about 60% of the meningiomas tested were positive for desmocollin 3 (Dsc3), a protein in epithelia taken as an indicator for differentiation
    Type of Publication: Journal article published
    PubMed ID: 12845453
    Signatur Availability
    BibTip Others were also interested in ...
  • 8
    Keywords: RECEPTOR ; CELLS ; EXPRESSION ; IN-VITRO ; Germany ; human ; DISEASE ; DISEASES ; MICE ; ACTIVATION ; COMPLEX ; MESANGIAL CELLS ; ARTHRITIS ; CELL ACTIVATION ; COMPLEXES ; CUTTING EDGE ; DNA ; IFN-GAMMA ; INFECTION ; kidney ; MACROPHAGES ; MECHANISM ; MESSENGER-RNA ; MESSENGER-RNA EXPRESSION ; MOTIFS ; murine ; OLIGODEOXYNUCLEOTIDES ; RECEPTOR EXPRESSION ; SERA ; TH1 RESPONSES ; TRIGGER
    Abstract: Immune complex glomerulonephritis (GN) often deteriorates during infection with viruses and bacteria that, in contrast to mammals, have DNA that contains many unmethylated CpG motifs. Balb/c mice with horse apoferritin-induced GN (HAF-GN) were treated with either saline, CpG-oligodeoxynucleotides (ODN), or control GpC-ODN. Only CpG-ODN exacerbated HAF-GN with an increase of glomerular macrophages, which was associated with massive albuminuria and increased renal MCP-1/CCL2, RANTES/CCL5, CCR1, CCR2, and CCR5 mRNA expression. CpG-ODN induced a Th1 response as indicated by serum anti-HAF IgG(2a) titers, mesangial IgG(2a) deposits, and splenocyte IFN-gamma secretion. Messenger RNA for the CpG-DNA receptor Toll-like reeptor 9 (TLR9) was present in kidneys with HAF-GN but not in normal kidneys. The source of TLR9 mRNA in HAF-GN could. be infiltrating macrophages or intrinsic renal cells, e.g., mesangial cells; but, in vitro, only murine J774 macrophages expressed TLR9. In J774 cells, CpG-ODN induced the chemokines MCP-1/CCL2 and RANTES/CCL5 and the chemokine receptors CCR1 and CCR5. It is concluded that CpG-DNA can aggravate preexisting GN via a shift toward a Th1 response but also by a novel pathway involving TLR9-mediated chemokine and chemokine receptor expression by macrophages, which may contribute to the enhanced glomerular macrophage recruitment and activation. This mechanism may be relevant during infection-triggered exacerbation of human immune-complex GN and other immune- mediated diseases in general
    Type of Publication: Journal article published
    PubMed ID: 12538732
    Signatur Availability
    BibTip Others were also interested in ...
  • 9
    Keywords: MODEL ; PROTEIN ; FAMILY ; PROTEIN FAMILIES ; PROTEIN FAMILY ; DOMAIN ; PAIRS ; recombination
    Abstract: There is a limited repertoire of domain families in nature that are duplicated and combined in different ways to form the set of proteins in a genome. Most proteins in both prokaryote and eukaryote genomes consist of two or more domains, and we show that the family size distribution of multi-domain protein families follows a power law like that of individual families. Most domain pairs occur in four to six different domain architectures: in isolation and in combinations with different partners. We showed previously that within the set of all pairwise domain combinations, most small and medium-sized families are observed in combination with one or two other families, while a few large families are very versatile and combine with many different partners. Though this may appear to be a stochastic pattern, in which large families have more combination partners by virtue of their size, we establish here that all the domain families with more than three members in genomes are duplicated more frequently than would be expected by chance considering their number of neighbouring domains. This duplication of domain pairs is statistically significant for between one and three quarters of all families with seven or more members. For the majority of pairwise domain combinations, there is no known three-dimensional structure of the two domains together, and we term these novel combinations. Novel domain combinations are interesting and important targets for structural elucidation, as the geometry and interaction between the domains will help understand the function and evolution of multi-domain proteins. Of particular interest are those combinations that occur in the largest number of multi-domain proteins, and several of these frequent novel combinations contain DNA-binding domains.
    Type of Publication: Journal article published
    PubMed ID: 14649290
    Signatur Availability
    BibTip Others were also interested in ...
  • 10
    Keywords: measurement ; Germany ; PERFUSION ; QUANTIFICATION ; LONG-TERM ; PIGS ; validation ; TIME ; PATIENT ; kidney ; SERA ; ACUTE REJECTION ; ALLOGRAFT SURVIVAL ; BLOOD-FLOW ; DONOR ; GRAFT ; HEPATIC MICROCIRCULATION ; IMPACT ; INDEX ; intraoperative ; LIVER-TRANSPLANTATION ; MICROCIRCULATION ; pig ; primary ; prognosis ; QUALITY ; REDUCTION ; renal ; renal function ; RENAL-FUNCTION ; REPERFUSION ; RISK-FACTORS ; TRANSPLANTATION
    Abstract: Background. We evaluated the significance of perioperative cortical microperfusion for graft function and long-term prognosis after renal allotransplantation. Thermodiffusion technology was clinically applied for the first time, after previous validation for perfusion monitoring of the renal cortex in pigs. Methods. A thermodiffusion probe was inserted into the renal cortex in 30 transplant recipients after graft reperfusion. Real-time measurements were recorded until the end of the operation. In 14 patients perfusion was measured daily until postoperative day 7. Microcirculation was correlated to serum creatinine level, scintigraphic findings, and long-term outcome. Results. In primary graft function, intraoperative perfusion was 85 7 mL/100 g per min compared with significantly lower values in cases with subsequent graft dysfunction. The best discrimination was defined for a level of 70 mL/100 g per min with a positive predictive value of 88% for detection of good graft function and 86% for nonfunction. Intraoperative perfusion was significantly different in patients with normal grafts, delayed function, and graft loss. Postoperatively, lower perfusion was found in acute tubular necrosis; a significant correlation could be noted between microcirculation and perfusion index measured by nuclear scanning (r=0.78, P〈0.01). Living-related grafts were characterized by higher intraoperative perfusion and superior graft quality. Conclusion. Thermodiffusion could be clinically applicable for the perioperative monitoring of renal graft perfusion. Intraoperative reduction of cortical microcirculation has a high predictive value with respect to detection of delayed renal function. Postoperatively, impaired renal microperfusion is associated with acute tubular necrosis. Living-related donor grafts show less microcirculatory alteration than cadaveric kidneys
    Type of Publication: Journal article published
    PubMed ID: 12717202
    Signatur Availability
    BibTip Others were also interested in ...
  • 11
    Keywords: EXPRESSION ; INHIBITOR ; Germany ; KINASE ; GENE ; GENES ; PROTEIN ; SACCHAROMYCES-CEREVISIAE ; transcription ; COMPONENTS ; COMPLEX ; COMPLEXES ; cell cycle ; CELL-CYCLE ; CYCLE ; protein kinase ; PROTEIN-KINASE ; IDENTIFICATION ; gene expression ; protein kinase CK2 ; Saccharomyces cerevisiae ; SUBUNIT ; YEAST ; BUDDING YEAST ; DISRUPTION ; EXPRESSION ANALYSIS ; HOLOENZYME ; PHO pathway
    Abstract: The budding yeast Saccharomyces cerevisiae encounters phosphate starvation by the transcription-regulated PHO pathway. We find that genetic perturbation of protein kinase CK2, a conserved tetrameric Ser/Thr phosphotransferase with links to cell cycle and transcription, affects expression of PHO pathway genes in a subunit- and isoform-specific manner. Remarkably, the genes encoding phosphate supplying phosphatases and transporters are significantly repressed, while the genes encoding components of the central pathway regulator complex, a cyclin-dependent kinase (CDK), a cyclin, and a CDK inhibitor, remain unaltered. Thus, perturbation of CK2 uncouples the executive part of the PHO pathway from its cyclin-CDK control complex. (C) 2003 Published by Elsevier Science B.V. on behalf of the Federation of European Biochemical Societies
    Type of Publication: Journal article published
    PubMed ID: 12606059
    Signatur Availability
    BibTip Others were also interested in ...
  • 12
    Keywords: COMBINATION ; Germany ; GENOME ; microarray ; COMPLEX ; COMPLEXES ; DNA ; SEQUENCE ; SEQUENCES ; antibodies ; antibody ; ARRANGEMENT ; ASSAY ; DNA microarray ; DNA microarray technology ; microarrays
    Abstract: While the deciphering of basic sequence information on a genomic scale is yielding complete genomic sequences in ever-shorter intervals, experimental procedures for elucidating the cellular effects and consequences of the DNA-encoded information become critical for further analyses. In recent years, DNA microarray technology has emerged as a prime candidate for the performance of many such functional assays. Technically, array technology has come a long way since its conception some 15 years ago, initially designed as a means for large-scale mapping and sequencing. The basic arrangement, however, could be adapted readily to serve eventually as an analytical tool in a large variety of applications. On their own or in combination with other methods, microarrays open up many new avenues of functional analysis. Copyright (C) 2003 John Wiley Sons, Ltd
    Type of Publication: Journal article published
    PubMed ID: 18629015
    Signatur Availability
    BibTip Others were also interested in ...
  • 13
    Keywords: EXPRESSION ; screening ; DISTINCT ; GENE ; GENES ; GENOME ; DNA ; FAMILY ; ASSOCIATION ; autistic disorder,susceptibility gene,chromosome 2,mutation screening,association ; CANDIDATE GENE ; chromosome ; DISORDER ; DLX GENES ; FREQUENCY ; GENOMEWIDE SCREEN ; GENOMIC SCREEN ; GLUTAMIC-ACID DECARBOXYLASE ; LINKAGE ; polymorphism ; POLYMORPHISMS ; SIGNAL ; single nucleotide polymorphism ; SUSCEPTIBILITY ; SUSCEPTIBILITY GENES ; SUSCEPTIBILITY LOCUS ; VARIANTS
    Abstract: The results from several genome scans indicate that chromosome 2q21-q33 is likely to contain an autism susceptibility locus. We studied the potential contribution of nine positional and functional candidate genes: TBR-1; GAD1; DLX1; DLX2; cAMP-GEFII; CHN1; ATF2; HOXD1 and NEUROD1. Screening these genes for DNA variants and association analysis using intragenic single nucleotide polymorphisms did not provide evidence for a major role in the aetiology of autism. Four rare nonsynonymous variants were identified, however, in the cAMP-GEFII gene. These variants were present in five families, where they segregate with the autistic phenotype, and were not observed in control individuals. The significance of these variants is unclear, as their low frequency in IMGSAC families does not account for the relatively strong linkage signal at the 2q locus. Further studies are needed to clarify the contribution of cAMP-GEFII gene variants to autism susceptibility
    Type of Publication: Journal article published
    PubMed ID: 14593429
    Signatur Availability
    BibTip Others were also interested in ...
  • 14
    Keywords: Germany ; human ; GENE-EXPRESSION ; RNA ; papillomavirus ; IMMUNE-RESPONSES ; PARTICLES ; transgenic ; CERVICAL-CANCER ; CAPSID PROTEIN ; CODON USAGE ; FUSION PROTEIN PROTECTS ; human papillomavirus ; L1 PROTEIN ; ORAL IMMUNIZATION ; TYPE-16 ; VACCINES ; VIRUS-LIKE PARTICLES
    Type of Publication: Journal article published
    PubMed ID: 12915537
    Signatur Availability
    BibTip Others were also interested in ...
  • 15
    Keywords: CANCER ; PROTECTION ; MODEL ; DISEASE ; EPIDEMIOLOGY ; HISTORY ; RISK ; GENE ; GENES ; SAMPLE ; FAMILY ; RISK-FACTORS ; SUSCEPTIBILITY ; BREAST ; breast cancer ; BREAST-CANCER ; AGE ; BRCA1 ; case-only design ; family history ; gene carrier probability ; LINKAGE ANALYSIS ; mixture logistic model ; ovarian cancer ; OVARIAN-CANCER ; population and sibling controls ; WOMEN
    Abstract: Background The effect of environmental/lifestyle factors on breast cancer risk may be modified by genetic predisposition. Methods In a population-based case-control-family study performed in Germany including 706 cases by age 50 years, 1381 population, and 252 sister controls, we investigated main effects for environmental/lifestyle factors and genetic susceptibility and gene-environment interaction (G x E). Different surrogate measures for genetic predisposition using pedigree information were used: first-degree family history of breast or ovarian cancer; and gene carrier probability using a genetic model based on rare dominant genes. Possible G x E interaction was studied by (1) logistic regression using cases and population controls including an interaction term; (2) comparing results using sister controls and population controls; (3) case-only analysis with logistic regression and (4) a mixture logistic model. Results Familial predisposition showed the strongest main effect and the estimated gene carrier probability gave the best fit. High parity and longer duration of breastfeeding reduced breast cancer risk significantly, a history of abortions increased risk and age at menarche showed no significant effect. We found significant G x E interaction between parity and genetic susceptibility using different surrogate measures. In women most likely to have a high genetic susceptibility, high parity was less protective. Later age at menarche was protective in women with a positive family history. No evidence for G x E interaction was found for breastfeeding and abortion. Conclusions These findings corroborate results from other studies and provide further evidence that the magnitude of protection from parity is reduced in women most likely to have a genetic risk in spite of the limitations of using surrogate genetic measures
    Type of Publication: Journal article published
    PubMed ID: 12690006
    Signatur Availability
    BibTip Others were also interested in ...
  • 16
    Keywords: RECEPTOR ; EXPRESSION ; GROWTH ; IN-VIVO ; PATHWAYS ; PROTEIN ; SACCHAROMYCES-CEREVISIAE ; COMPLEX ; COMPLEXES ; BINDING ; IDENTIFICATION ; Saccharomyces cerevisiae ; YEAST ; lifestyle ; BETA ; CONSERVATION ; EGG EXTRACTS ; GTPASE RAN ; IMPORTIN-ALPHA ; LOCALIZATION ; MESSENGER-RNA EXPORT ; NUCLEAR EXPORT RECEPTOR ; NUCLEUS ; TRANSPORT FACTOR ; XENOPUS
    Abstract: The small Ras-like GTPase Ran plays an essential role in the transport of macromolecules in and out of the nucleus and has been implicated in spindle (1, 2) and nuclear envelope formation (3, 4) during mitosis in higher eukaryotes. We identified Saccharomyces cerevisiae open reading frame YGL164c encoding a novel RanGTP-binding protein, termed Yrb30p. The protein competes with yeast RanBP1 (Yrb1p) for binding to the GTP-bound form of yeast Ran (Gsp1p) and is, like Yrb1p, able to form trimeric complexes with RanGTP and some of the karyopherins. In contrast to Yrb1p, Yrb30p does not coactivate but inhibits RanGAP1(Rna1p)-mediated GTP hydrolysis on Ran, like the karyopherins. At steady state, Yrb30p localizes exclusively to the cytoplasm, but the presence of a functional nuclear export signal and the localization of truncated forms of Yrb30p suggest that the protein shuttles between nucleus and cytoplasm and is exported via two alternative pathways, dependent on the nuclear export receptor Xpo1p/Crm1p and on RanGTP binding. Whereas overproduction of the full-length protein and complete deletion of the open reading frame reveal no obvious phenotype, overproduction of C-terminally truncated forms of the protein inhibits yeast vegetative growth. Based on these results and the exclusive conservation of the protein in the fungal kingdom, we hypothesize that Yrb30p represents a novel modulator of the Ran GTPase switch related to fungal lifestyle
    Type of Publication: Journal article published
    PubMed ID: 12578832
    Signatur Availability
    BibTip Others were also interested in ...
  • 17
    Keywords: CANCER ; CELLS ; IRRADIATION ; carcinoma ; CELL ; Germany ; THERAPY ; DEATH ; EXPOSURE ; radiation ; DNA ; REDUCTION ; SUFFICIENT ; FLOW ; treatment ; PARTICLES ; CARCINOMA CELLS ; CELL-DEATH ; CERVIX ; DAMAGE ; FRANCE ; BEAM ; bioshuttle ; BORON ; boron neutron capture therapy (BNCT) ; boronophenylalanine (BPA) ; CAPTURE THERAPY ; CARCINOMA-CELLS ; CELLULAR UPTAKE ; DELIVERY ; DNA-DAMAGE ; drug delivery ; LET-effects ; nuclear transport
    Abstract: Boron neutron capture therapy (BNCT) is an experimental treatment modality which depends on a sufficient cellular uptake of Boron (B-10) followed by an exposure to a thermal neutron beam from a. nuclear reactor. High energetic particles (He-4 and Li-7) are. created during the neutron capture reaction and produce DNA damages, which lead to cell killing. Regarding BNCT, the short radiation range of He- and Li-particles is decisive for the distribution of B-10. Until now, BNCT has been lacking for therapeutically effective concentrations of B-10. Twenty-four hours after the combined use of our 'Bioshuttle'-p-borono-phenylalanine(10)-constructs ('Bioshuttle'-p-BPA(10)) and neutron-irradiation, an obvious reduction of the radiation-resistant HeLa-S cells could be observed. No cells were alive 72 h after the incubation with 'Bioshuttle'-p-BPA(10) followed by neutron irradiation. A post-mitotic cell death could be assumed based on flow cytometrical data. (C) 2003 Editions scientifiques et medicales Elsevier SAS. All rights reserved
    Type of Publication: Journal article published
    PubMed ID: 12832130
    Signatur Availability
    BibTip Others were also interested in ...
  • 18
    Keywords: CANCER ; CELLS ; INHIBITOR ; INVASION ; tumor ; CELL ; COMBINATION ; Germany ; INHIBITION ; KINASE ; PATHWAY ; THERAPY ; DISEASE ; DISEASES ; SITE ; PROTEIN ; COMPLEX ; COMPLEXES ; MECHANISM ; DOMAIN ; BINDING ; PHOSPHORYLATION ; protein kinase ; PROTEIN-KINASE ; treatment ; CATALYTIC SUBUNIT ; inactivation ; FIBER ; ADHESION ; ATP ; CELL-ADHESION ; crystal structure ; CRYSTAL-STRUCTURE ; MUSCLE ; PKA ; PROTEIN-KINASES
    Abstract: Protein kinases require strict inactivation to prevent spurious cellular signaling; overactivity can cause cancer or other diseases and necessitates selective inhibition for therapy. Rho-kinase is involved in such processes as tumor invasion, cell adhesion, smooth muscle contraction, and formation of focal adhesion fibers, as revealed using inhibitor Y-27632. Another Rho-kinase inhibitor, HA-1077 or Fasudil, is currently used in the treatment of cerebral vasospasm; the related nanomolar inhibitor H-1152P improves on its selectivity and potency. We have determined the crystal structures of HA-1077, H-1152P, and Y-27632 in complexes with protein kinase A (PKA) as a surrogate kinase to analyze Rho-kinase inhibitor binding properties. Features conserved between PKA and Rho-kinase are involved in the key binding interactions, while a combination of residues at the ATP binding pocket that are unique to Rho-kinase may explain the inhibitors' Rho-kinase selectivity. Further, a second H-1152P binding site potentially points toward PKA regulatory domain interaction modulators
    Type of Publication: Journal article published
    PubMed ID: 14656443
    Signatur Availability
    BibTip Others were also interested in ...
  • 19
    Keywords: Germany ; MICROSCOPY ; IMAGES ; VISUALIZATION ; RNA ; transcription ; MOLECULES ; TIME ; DNA ; BINDING ; polymer ; NUMBER ; ELECTRON ; SURFACE ; LENGTH ; MICA ; MONTE-CARLO SIMULATIONS ; PARAMETERS ; SCATTERING ; STATISTICAL-ANALYSIS ; SUPERHELIX
    Abstract: The conformations of supercoiled (sc) DNA and linear DNA bound to polylysine (PL)-coated mica were investigated by scanning force microscopy (SFM) in solution. From the polymer statistical analysis of linear DNA, we could distinguish between re-arrangements or trapping of the DNA on the surface. Conditions of re-arrangements to an almost equilibrated state can be achieved at appropriate PL surface concentrations. We could show that the ability of re-arrangements depends on the salt concentration of the adsorption/imaging buffer. Comparing the statistical analysis of the linear DNA with SFM images of scDNA suggested that irregular scDNA conformations are formed under conditions of trapping, whereas plectonemic structures are favoured under conditions of surface re-arrangements. Salt-dependent changes in the scDNA conformation over the range of 10-100 mM NaCl, as characterised by the parameters writhe and the superhelix radius r, are observable only under conditions that enable surface re-arrangements. The measured values of writhe suggest that the scDNA loses approximately one-half of the supercoils during the binding to the surface. At the same time r increases systematically with decreasing writhe, thus the scDNA topology remains determined by the constraints on supercoiling during the binding to PL-coated mica
    Type of Publication: Journal article published
    PubMed ID: 14602930
    Signatur Availability
    BibTip Others were also interested in ...
  • 20
    Keywords: PEPTIDE ; RECEPTOR ; CELLS ; EXPRESSION ; Germany ; PROTEIN ; DRUG ; MOLECULES ; LINES ; MICE ; COMPLEX ; murine ; primary ; ANTIGEN ; ANTIGENS ; BIOSYNTHESIS ; LYMPHOCYTES ; antigen presentation ; B-CELLS ; CLASS-II MOLECULES ; EXCHANGE ; H2-O ; HLA-DM ; HLA-DO ; IA MOLECULES ; INVARIANT CHAIN ; MHC MOLECULES ; MONOCLONAL- ANTIBODY ; PEPTIDE REPERTOIRE ; PEPTIDES ; T- CELLS
    Abstract: Peptide loading onto MHC class II molecules takes place in endosomal compartments along the endocytic pathway. There, loading is facilitated by the catalytic function of the accessory molecule H2-M, which helps to exchange the invariant chain-derived CLIP peptide in the groove of class II molecules for antigenic peptide. H2-O is another accessory molecule specific to the class II pathway, which is found tightly associated with H2-M and selectively expressed in B cells. Using stable H2-O ribozyme-antisense transfectants, H2-O overexpressing murine B cell lines, and H2-O-transgenic mice, we investigated the effects of H2-O on antigen presentation. The results show that presentation of a variety of exogenous protein antigens to a panel of T cell hybridomas depended on the levels of H2-O in the antigenpresenting B cells. Thus, increased H2-O expression downmodulated, whereas reduced H2-O levels, enhanced presentation. Presentation of endogenous antigen was also diminished by H2-O. Despite the pronounced effects on antigen presentation, the mass spectrometric profiles of peptides eluted from A(b) molecules were very similar in cells expressing different H2-O levels. The intracellular location of H2-O inhibitory activity was investigated with the drug chloroquine, which prevents acidification of the endocytic pathway. The observations indicate that H2-O predominantly inhibits antigen presentation in early endosomal compartments. Thus, H2-O appears to skew peptide loading to late endosomal/lysosomal compartments. This may favor presentation of antigens taken up by the B cell receptor
    Type of Publication: Journal article published
    PubMed ID: 12645938
    Signatur Availability
    BibTip Others were also interested in ...
  • 21
    Keywords: CLINICAL-TRIAL ; Germany ; SAMPLE ; PATIENT ; DESIGN ; CLINICAL-TRIALS ; chemotherapy ; RECRUITMENT ; CENTERS ; clinical trial : randomized,multi-center,design,hypotheses,significance,sample size ; III COLON-CANCER ; study design
    Abstract: In discussing design and results of randomized clinical trials, in particular with clinical oncologists, one often encounters the opinion that a phase III trial is a complicated, highly costly, and difficult task. Part of this opinion seems to originate in myths around underlying biostatistical principles such as randomization, sampling and sample size, statistical hypotheses, statistical error probabilities, and statistical power. This work clarifies basic statistical issues of randomized clinical trials and the interpretation of their results. Six issues ('myths') relevant for the design of clinical trials and the interpretation of their results are addressed. They concern choice of study design, choice of participating centers, and recruitment of patients as well as statistical questions of establishing study hypotheses and interpreting p values. These myths are shown to be caused primarily through a misunderstanding of statistical inference and statistical thinking that can be avoided when a rational understanding of statistical principles is translated into a clinical research approach. We also conclude that before clinical evidence is summarized from different studies each study should be examined thoroughly
    Type of Publication: Journal article published
    PubMed ID: 14709929
    Signatur Availability
    BibTip Others were also interested in ...
  • 22
    Keywords: Germany ; LUNG ; PERFUSION ; imaging ; VENTILATION ; DIFFERENTIATION ; RESOLUTION ; PATIENT ; IMPACT ; image analysis ; MR ; MRI ; SEQUENCE ; SIGNAL ; MAGNETIC-RESONANCE ; magnetic resonance imaging ; ACQUISITION ; REQUIRES ; SCINTIGRAPHY ; ABNORMALITIES ; acquisitions (GRAPPA) ; ANGIOGRAPHY ; CONTRAST-ENHANCED MRI ; generalized autocalibrating partially parallel ; magnetic resonance imaging (MRI) ; parallel imaging techniques ; PULMONARY PERFUSION
    Abstract: Rationale: Contrast-enhanced magnetic resonance imaging (MRI) of lung perfusion requires a high spatial and temporal resolution. Partially parallel MRI offers an improved spatial and temporal resolution. Objective: To assess the feasibility of partially parallel MRI for the assessment of lung perfusion. Methods: Two healthy volunteers and 14 patients were examined with a contrast-enhanced 3D gradient-echo pulse sequence with partially parallel image acquisitions (TE/TR/alpha: 0.8/1.9 milliseconds/40degrees; voxel size 3.6 X 2.0 X 5.0 mm(3), TA: 1.5 seconds). The image analysis included an analysis of the signal-to-noise ratio in the lungs in areas with normal and impaired perfusion. 3D MR perfusion image data were analyzed for perfusion defects and compared with radionuclide perfusion scans, which were available for 10 of 14 patients. Results: The analysis of the 3D perfusion-weighted data allowed a clear differentiation of perfusion abnormalities: MRI showed normal lung perfusion in 9 of 16 cases, whereas perfusion abnormalities were observed in 7 cases. When compared with the radionuclide perfusion scans, a good intermodality agreement was shown (kappa = 0.74). When compared with normally perfused lung a significantly lower signal to noise ratio was observed in hypoperfused lung (7 versus 17; P = 0.02). Conclusion: Partially parallel MRI might be used for the assessment of lung perfusion. Future studies are required to further evaluate the diagnostic impact of this technique
    Type of Publication: Journal article published
    PubMed ID: 12874514
    Signatur Availability
    BibTip Others were also interested in ...
  • 23
    facet.materialart.
    facet.materialart.
    Internist 44 (9), 1131-1139 
    Keywords: Germany ; THERAPY ; COMMON ; DIAGNOSIS ; DISEASE ; NEW-YORK ; POPULATION ; RISK ; TIME ; PATIENT ; NEPHRITIS ; INFECTION ; GRAFT ; renal ; STAGE ; IDENTIFICATION ; PROGRESSION ; EXPERIENCE ; RISK FACTOR ; RECURRENCE ; FREQUENT ; CLINICAL-FEATURES ; CLINICALLY-RELEVANT ; CYCLOPHOSPHAMIDE ; FAILURE ; glomerulonephritis ; HYPERTENSION ; INFECTIONS ; NATURAL-HISTORY ; NEPHROPATHY ; PREDICTORS ; PREVALENCE ; proteinuria ; RECURRENT ; renal insufficiency ; renoparenchymal hypertension ; RISK GROUP ; STAGE RENAL-FAILURE
    Abstract: IgA nephropathy (IgAN) is the most common type of glomerulonephritis in the western world. In the majority of cases, it manifests in adolescence or early adulthood as recurrent macrohematuria, frequently triggered by infections, or persistent microhematuria as well as mild proteinuria, hypertension and/or renal insufficiency. In view of the later, it is not surprising that IgAN is often a chance finding. The majority of affected persons probably never come to medical attention, since in autopsies a prevalence of up to 1% of the population has been reported. About 20-30% of patients with a diagnosis of IgAN suffer from chronic, slowly progressive renal failure. Predictors include the degree of proteinuria and arterial hypertension as well as the established renal impairment at the time of diagnosis. Early identification of this risk group is of particular importance, since adequate therapy can stop or at least retard the progression of renal failure. When end stage renal failure has developed and a renal transplant is performed, about 25% of the patients will experience a clinically relevant recurrence of IgAN with progressive graft dysfunction
    Type of Publication: Journal article published
    Signatur Availability
    BibTip Others were also interested in ...
  • 24
    Keywords: SURVIVAL ; tumor ; Germany ; INHIBITION ; MODEL ; MODELS ; DISEASE ; DISEASES ; incidence ; liver ; RISK ; SITE ; SITES ; GENE ; TUMORS ; STORAGE ; TIME ; PATIENT ; NITRIC-OXIDE SYNTHASE ; INJURIES ; DNA ; INFECTION ; RISK-FACTORS ; CARCINOGENESIS ; RAT ; RATS ; PROTEIN-KINASE ; treatment ; virus ; prevention ; STRESS ; risk factors ; metastases ; DAMAGE ; chemoprevention ; COLON CARCINOGENESIS ; copper toxicity ; curcumin ; ETHENO-DNA ADDUCTS ; HEREDITARY HEPATITIS ; LEC rats ; LIPID-PEROXIDATION ; MOUSE FIBROBLAST CELLS ; NIH 3T3 ; ORNITHINE DECARBOXYLASE ; OXIDATIVE STRESS
    Abstract: Long-Evans Cinnamon (LEC) rats, an inbred mutant strain which accumulates copper due to an aberrant copper-transporting ATPase gene, develop acute hepatitis, chronic liver injury and liver tumors as a result of copper-induced oxidative stress, lipid peroxidation and DNA damage. Curcumin, an antioxidant and anti-inflammatory agent, has shown anticancer properties in many rodent models. We investigated the modulating role of curcumin in liver and kidney carcinogenesis in LEC rats. Two groups of 4-week-old LEC rats (n = 60 each) were fed either a standard diet (control) or received 0.5% curcumin in the diet for life. In untreated LEC rats, the rate of acute liver failure, the incidence of liver tumors and of kidney tumors were 32, 100 and 10% respectively, which was not altered by curcumin treatment. However, curcumin reduced tumor incidence at other organ sites (15% versus 0%; P = 0.025) and suppressed formation of metastases (18% versus 0%; P = 0.01). Median survival time was decreased from 88.7 to 78.1 weeks in curcumin-treated rats (P = 0.002). The lack of chemoprevention of liver and kidney tumors in LEC rats by curcumin may be caused by enhanced toxicity and oxidative stress due to excess copper. We conclude that curcumin should be contra-indicated for patients suffering from inherited and acquired metal storage diseases that include patients with hepatitis C virus infection. (C) 2002 Elsevier Science B.V. All rights reserved
    Type of Publication: Journal article published
    PubMed ID: 12628510
    Signatur Availability
    BibTip Others were also interested in ...
  • 25
    Keywords: EXPRESSION ; tumor ; carcinoma ; CELL ; Germany ; TYROSINE KINASE ; screening ; SITE ; SITES ; DISTINCT ; microarray ; PROTEIN ; TISSUE ; TUMORS ; primary ; GROWTH-FACTOR RECEPTOR ; FREQUENCY ; FREQUENCIES ; STAGE ; PROGRESSION ; immunohistochemistry ; ABERRATIONS ; HEAD ; ONCOPROTEIN ; CARCINOMAS ; NECK ; squamous cell carcinoma ; GREECE ; gene amplification ; head and neck ; laryngeal carcinoma ; OROPHARYNGEAL ; C-MYC ; CANCER PATIENTS ; CYCLIN D1 OVEREXPRESSION ; cytogenetic aberration ; head and neck squamous cell carcinoma (HNSCC) ; immunohistochemistry (IHC) ; MICROARRAY ANALYSIS ; oncoprotein overexpression ; OVEREXPRESSION ; POOR-PROGNOSIS ; tissue microarray (TMA) ; tumor classification
    Abstract: Background: Tissue microarray (TMA) analysis is a high-throughput approach that allows the screening of large tumor collectives for cytogenetic aberrations. In this study, a TMA of a large collection of clinically well-defined primary squamous cell carcinomas of the head and neck (HNSCC) was used to determine the expression of several oncoproteins. Materials and Methods: A TMA containing 547 primary HNSCC was used for the analysis of cyclinD1, c-myc, erbb1 and erbb2 expression by immunohistochemistry (IHC). Results: CyclinD1 and c-myc were overexpressed at higher frequencies in primary pharyngeal and laryngeal carcinomas compared with primary oral carcinomas (p 〈 0.001 and p 〈 0.001), while erbb1 and erbb2 overexpression was associated with oral site (p 〈 0.001 and p = 0.04, respectively). Furthermore, cyclinD1 overexpression correlated with stage IV primary carcinomas (p = 0.04). Conclusion: HNSCC is a heterogenous group of tumors, which, depending on anatomic sites and clinical stage, shows variable expressions of the oncoproteins described. This indicates a specific pathogenic role of these oncoproteins in different subtypes of HNSCC and may have therapeutic implications
    Type of Publication: Journal article published
    PubMed ID: 14666705
    Signatur Availability
    BibTip Others were also interested in ...
  • 26
    Keywords: EXPRESSION ; Germany ; QUANTIFICATION ; TIME ; PATIENT ; treatment ; ALPHA ; ASSAY ; DECREASE ; POLYMERASE-CHAIN-REACTION ; INTERFERON
    Abstract: We developed a real-time quantitative polymerase chain reaction-based assay for quantification of PRV-1 mRNA. We found that the expression of PRV-1 in granulocytes of patients with polycythemia vera (PV) who were pretreated with phlebotomy or hydroxyurea was significantly higher than that in normal controls. Surprisingly, in PV patients who had received interferon-alpha (IFN) for five or more months no significant PRV-1 upregulation was found. Observation of four PV patients treated with IFN over six months revealed a uniform time- dependent decrease of initially upregulated PRV-1
    Type of Publication: Journal article published
    PubMed ID: 12651277
    Signatur Availability
    BibTip Others were also interested in ...
  • 27
    Keywords: OPTIMIZATION ; PEPTIDE ; SPECTRA ; CELLS ; EXPRESSION ; INHIBITOR ; Germany ; PROTEIN ; PROTEINS ; MOLECULES ; MICE ; ACTIVATION ; COMPLEX ; COMPLEXES ; murine ; MEMBER ; MHC ; LYMPHOCYTES ; antigen presentation ; PEPTIDES ; STABILITY ; MHC class I ; DEGRADATION ; SUBUNITS ; TRANSLOCATION ; antigen processing ; CELL-LINE .220 ; HISTOCOMPATIBILITY COMPLEX ; LOADING COMPLEX ; MUTANT MICE ; NEWLY SYNTHESIZED PROTEINS
    Abstract: Tapasin is a member of the MHC class I loading complex where it bridges the TAP peptide transporter to class I molecules. The main role of tapasin is assumed to be the facilitation of peptide loading and optimization of the peptide cargo. Here, we describe another important function for tapasin. In tapasin- deficient (Tpn(-/-)) mice the absence of tapasin was found to have a dramatic effect on the stability of the TAP1/TAP2 heterodimeric peptide transporter. Steady-state expression of TAP protein was reduced more than 100-fold from about 3 x 10(4) TAP molecules per wild-type splenocyte to about 1 x 10(2) TAP per Tpn(-/-) splenocyte. Thus, a major function of murine tapasin appears to be the stabilization of TAR The low amount of TAP molecules in Tpn(-/-) lymphocytes is likely to contribute to the severe impairment of MHC class I expression. Surprisingly, activation of Tpn(-/-) lymphocytes yielded strongly enhanced class I expression comparable to wild-type levels, although TAP expression remained low and in the magnitude of several hundred molecules per cell. The high level of class I on activated Tpn(-/-) cells depended on peptides generated by the proteasome as indicated by blockade with the proteasome-specific inhibitor lactacystin. Lymphocyte activation induced an increase in ubiquitinated proteins that are cleaved into peptides by the proteasome. These findings suggest that in the presence of a large peptide pool in the cytosol, a small number of TAP transporters is sufficient to translocate enough peptides for high class I expression. However, these class I molecules were less stable than those of wild-type cells, indicating that tapasin is not only required for stabilization of TAP but also for optimization of the spectrum of bound peptides
    Type of Publication: Journal article published
    PubMed ID: 12594855
    Signatur Availability
    BibTip Others were also interested in ...
  • 28
    Keywords: CELLS ; EXPRESSION ; CELL ; Germany ; human ; SYSTEM ; DISTINCT ; PROTEIN ; EPITHELIA ; MOLECULES ; TISSUE ; TISSUES ; SKIN ; GLYCOPROTEIN ; ELEMENTS ; SURFACE ; LOCALIZATION ; GLANDS ; SEGMENTS ; calnexin ; ESTABLISHMENT ; MUCINS ; salivary gland ; sebaceous gland ; SEBACEOUS GLANDS
    Abstract: Calnexin (Cnx) has been characterized as a membrane-bound protein that transiently interacts in a unique chaperone system with newly synthesized glycoproteins in order to allow the establishment of their proper tertiary and, in most cases, quarternary structures. The aim of the study was to identify and to locate the expression of Cnx in the three major salivary glands of humans by different methods. Strong expression of Cnx protein and mRNA were generally found in serous salivary secretory units. With regard to mucous secretory units, expression of Cnx was only detectable at a low level in mucous acinar cells of sublingual glands, but not of submandibular glands. Expression of Cnx was always preserved in the surface epithelium of intralobar and interlobular duct segments. In addition, expression of Cnx was detected in sebaceous glands of parotid tissues, with a distribution pattern resembling that seen in sebaceous glands of the normal skin. In conclusion, production of saliva is associated with the expression of Cnx. Synthesis of molecules in mucous secretory units is not necessarily associated with a strong Cnx expression, whereas synthesis in serous secretory units apparently is. The tissue- specific Cnx expression is also paralleled by the observation that the secretions produced by the major salivary glands differ in their composition and amount
    Type of Publication: Journal article published
    PubMed ID: 12507291
    Signatur Availability
    BibTip Others were also interested in ...
  • 29
    Keywords: APOPTOSIS ; CANCER ; CANCER CELLS ; CELLS ; EXPRESSION ; INHIBITOR ; tumor ; TUMOR-CELLS ; CELL ; Germany ; human ; IN-VIVO ; INHIBITION ; DEATH ; GENE ; GENE-EXPRESSION ; RNA ; TUMORS ; ACTIVATION ; PROTEIN FAMILY ; INDUCTION ; SUSCEPTIBILITY ; TARGET ; gene expression ; resistance ; HUMAN-TUMORS ; STIMULI ; CANCER-CELLS ; DELIVERY ; MAMMALIAN-CELLS ; SMALL INTERFERING RNAS ; doxorubicin ; HUMAN-TUMOR-CELLS ; IAP PROTEINS ; POSITIVE CANCER-CELLS ; RNA interference,inhibitors of apoptosis,chemotherapy,HeLa,melanoma ; STRATEGIES
    Abstract: Increased resistance to apoptosis is a hallmark of many tumor cells. The functional inhibition of specific antiapoptotic factors may provide a rational basis for the development of novel therapeutic strategies. We investigated here whether the RNA interference (RNAi) technology could be used to increase the apoptotic susceptibility of cancer cells. As a molecular target, we chose the antiapoptotic livin (ML-IAP, KIAP) gene, which is expressed in a subset of human tumors. We identified vector-borne small interfering (si)RNAs, which could efficiently block endogenous livin gene expression. Silencing of livin was associated with caspase-3 activation and a strongly increased apoptotic rate in response to different proapoptotic stimuli, such as doxorubicin, UV-irradiation, or TNFalpha. The effects were specific for Livin-expressing tumor cells. Our results (i) provide direct evidence that the intracellular interference with livin gene expression resensitizes human tumor cells to apoptosis, (ii) define the livin gene as a promising molecular target for therapeutic inhibition, and (iii) show that the livin gene is susceptible to efficient and specific silencing by the siRNA technology
    Type of Publication: Journal article published
    PubMed ID: 14614456
    Signatur Availability
    BibTip Others were also interested in ...
  • 30
    Keywords: CELLS ; INHIBITOR ; tumor ; BLOOD ; Germany ; human ; liver ; DRUG ; LIGAND ; SERA ; RAT ; hepatocytes ; BINDING ; ACIDS ; TRANSPORT ; IDENTIFICATION ; PLASMA ; POLYPEPTIDE ; albumin receptor ; bilirubin ; BOVINE SERUM-ALBUMIN ; BSP ; fatty acids ; FATTY-ACIDS ; FREE FATTY-ACIDS ; hepatic uptake ; HEPATIC-UPTAKE ; HSA ; HUMAN LIVER ; organic anion transporters ; ORGANIC-ANIONS
    Abstract: Background. Despite their strong binding to albumin while circulating in blood, many organic anions, such as bilirubin and fatty acids, are removed efficiently by the liver. The uptake transporters of human hepatocytes, OATP2 (symbol, SLC21A6) and OATP8 (SLC21A8), play important roles in the hepatic uptake of endogenous substances and drugs. The two transporters show different affinities for the organic anion sulfobromophthalein (BSP), which binds with high affinity to albumin in blood. Methods. In this study, we investigated whether a direct interaction of albumin with OATP2 or OATP8 occurs during the uptake of BSP. The uptake of BSP, at varying concentrations of human serum albumin (HSA), into transfected HEK293 cells expressing recombinant human OATP2 or OATP8 was measured. The influence of other organic anions on the uptake of albumin-bound BSP by OATP2 or OATP8 was also studied. Results. OATP8-mediated transport was affected more strongly by HSA than OATP2-mediated transport. Albumin affected both transporters in the manner of a noncompetitive inhibitor. Uptake studies using OATP2-transfected MDCKII cells indicated that a direct interaction between albumin and OATP2 is not necessary for uptake, a finding that was further confirmed by the effects of bilirubin and palmitate on the binding of BSP to albumin and on the uptake of BSP by OATP2 or OATP8. Conclusions. Our results indicated that uptake of albumin-bound BSP occurs only from the pool of unbound ligand
    Type of Publication: Journal article published
    PubMed ID: 12560923
    Signatur Availability
    BibTip Others were also interested in ...
  • 31
    Keywords: CELLS ; EXPRESSION ; tumor ; BLOOD ; carcinoma ; human ; MICROSCOPY ; liver ; PROTEIN ; PROTEINS ; TUMORS ; FAMILY ; RAT ; hepatocytes ; MEMBER ; MEMBERS ; antibodies ; MOUSE ; IDENTIFICATION ; RAT-LIVER ; MEMBRANE ; metastases ; CONJUGATE ; LOCALIZATION ; EPITHELIAL-CELLS ; HEPATOCYTE CANALICULAR ISOFORM ; METASTATIC CARCINOMAS ; MULTIDRUG-RESISTANCE PROTEIN ; POLYPEPTIDE OATP2
    Abstract: Transport proteins mediating the selective uptake of organic anions into human hepatocytes include the organic anion transporters SLC21A6 (also termed OATP2, OATP-C, or LST-1) and SLC21A8 (OATP8). Both transporters are localized to the basolateral membrane of human hepatocytes. Because of the importance of these transporters for hepatobiliary elimination, including the removal of bilirubin and its conjugates from the blood circulation, we have generated monoclonal antibodies for studies on the expression and localization of these transport proteins. We describe two antibodies, designated monoclonal antibody MDQ (mMDQ) and monoclonal antibody ESL (mESL), directed against the amino terminus and the carboxyl terminus of human SLC21A6, respectively. Both antibodies have been characterized by immunoblot analysis, immunoprecipitation, and immunofluorescence microscopy. While mESL reacted specifically with SLC21A6, mMDQ detects both SLC21A6 and SLC21A8. Neither of the two antibodies reacted with other human, or with dog, rat, or mouse liver SLC21A family members. Antibody mMDQ may be used for the simultaneous detection of SLC21A6 and SLC21A8 in immunoblotting because of its immunoreactivity with both molecules and because of the different molecular masses of both glycosylated proteins in human hepatocytes. This is exemplified in hepatocellular carcinomas where SLC21A6 and SLC21A8 were differentially synthesized and showed an irregular staining pattern. Both transport proteins have not been detected in human hepatoma HepG2 cells. In routine paraffin sections, 10 of 12 hepatocellular carcinomas were focally positive with antibody mMDQ. In contrast, cholangiocarcinomas and liver metastases of colorectal and pancreatic adenocarcinoma were negative without exception. This suggests the usefulness of SLC21A6/SLC21A8 within a panel of tumor markers for hepatocellular carcinomas. Moreover, both antibodies should be useful in studies on the expression and localization of two important uptake transporters of human hepatocytes under physiologic and pathophysiologic conditions
    Type of Publication: Journal article published
    Signatur Availability
    BibTip Others were also interested in ...
  • 32
    Keywords: CANCER ; IN-VITRO ; tumor ; AGENTS ; Germany ; IN-VIVO ; INHIBITION ; screening ; SYSTEM ; SYSTEMS ; RISK ; ENZYMES ; DRUG ; NITRIC-OXIDE ; murine ; RISK-FACTORS ; CARCINOGENESIS ; INDUCTION ; KERATINOCYTES ; mechanisms ; culture ; IDENTIFICATION ; prevention ; risk factors ; MODULATION ; RISK FACTOR ; butyrate ; HEPATOMA ; fatty acids ; FATTY-ACIDS ; NF-kappa B ; ALCOHOL ; SODIUM-BUTYRATE ; curcumin ; ORNITHINE DECARBOXYLASE ; ANTIOXIDANT ; bioassay systems ; cancer chernoprevention ; CONSTITUENTS ; iNOS ; PEITC ; SULFORAPHANE ; SUPEROXIDE
    Abstract: Identification and use of effective cancer chemopreventive agents have become an important issue in public health-related research. For identification of potential cancer chemopreventive constituents we have set up a battery of cell- and enzyme-based in vitro marker systems relevant for prevention of carcinogenesis in vivo. These systems include modulation of drug metabolism (inhibition of Cyp1A activity, induction of NAD(P)H:quinone reductase (QR) activity in Hepalclc7 murine hepatoma cell culture), determination of radical scavenging (DPPH scavenging) and antioxidant effects (scavenging of superoxide anion-, hydroxyl- and peroxyl- radicals), anti-inflammatory mechanisms (inhibition of lipopolysaccharide (LPS)-mediated nitric oxide (NO) generation by inducible NO synthase (iNOS) in Raw 264.7 murine macrophages, cyclooxygenase-1 (Cox-1) inhibition), and anti- tumor promoting activities (inhibition of phorbol ester-induced ornithine decarboxylase (ODC) activity in 308 murine keratinocytes). We have tested a series of known chemopreventive substances belonging to several structural classes as reference compounds for the identification of novel chemopreventive agents or mechanisms. These include organosulfur compounds (phenethylisothiocyanate (PEITC), diallylsulfide, diallyldisulfide), terpenes (limonene, perillyl alcohol, oleanolic acid, 18-beta-glycyrrhetinic acid), short- chain fatty acids (sodium butyrate), indoles (indole-3- carbinol), isoflavonoids (quercetin, silymarin, genistein), catechins ((-)-epigallocatechin gallate (EGCG)), simple phenols (ellagic acid, resveratrol, piceatannol, curcumin), pharmaceutical agents (piroxicam, acetylsalicylic acid, tamoxifen), and vitamins/derivatives (ascorbic acid, Trolox). We confirmed known chemopreventive mechanisms of these compounds. Additionally, we could demonstrate the usefulness of our approach by identification of hitherto unknown mechanisms of selected agents. As an example, we detected anti- inflammatory properties of PEITC, based on NF-kappaB-mediated inhibition of NO production. Further, PEITC inhibited phorbol ester-induced superoxide anion radical production in granulocytes, and ODC induction in the 308 cell line. These mechanisms might contribute to the chemopreventive potential of PEITC. (C) 2002 Elsevier Science B.V. All rights reserved
    Type of Publication: Journal article published
    PubMed ID: 12628514
    Signatur Availability
    BibTip Others were also interested in ...
  • 33
    Keywords: CANCER ; EXPRESSION ; carcinoma ; CELL ; Germany ; human ; LUNG ; lung cancer ; LUNG-CANCER ; EXPOSURE ; RISK ; GENE ; PROTEIN ; METABOLISM ; TISSUE ; PATIENT ; RISK-FACTORS ; FREQUENCY ; polymorphism ; SUSCEPTIBILITY ; PROMOTER ; OVARIAN-CANCER ; WOMEN ; MEN ; risk factors ; smoking ; PROSTATE-CANCER ; cancer risk ; RISK FACTOR ; CYP3A4 ; LINKAGE DISEQUILIBRIUM ; CANCER-PATIENTS ; CARCINOMAS ; POLYMERASE-CHAIN-REACTION ; adenocarcinoma ; ADENOCARCINOMAS ; CARRIERS ; case-control studies ; CLINICAL PRESENTATION ; CYP3A,genetic polymorphism,lung cancer susceptibility,small cell lung cancer,LightCycler ; EXPRESSED HUMAN CYTOCHROME-P450S ; GENETIC VARIANT ; HUMAN LIVER-MICROSOMES ; PROSTATE TUMORS ; PROTEIN LEVELS ; squamous cell carcinoma ; TOBACCO
    Abstract: CYP3A isozymes are involved in tobacco carcinogen- and steroid-metabolism, and are expressed in human lung tissue showing interindividual variation in expression and activity. The CYP3A4* 1 B allele has been associated with a two-fold higher promoter activity and with high-grade prostate cancers. The very frequent intron 3 polymorphism in the CYP3A5 gene (CYP3A5*3) results in decreased CYP3A5 protein levels. A case-control study was conducted in 801 Caucasian lung cancer patients that included 330 adenocarcinomas, 260 squamous cell carcinomas, 171 small cell lung cancers (SCLC) and 432 Caucasian hospital-based controls. CYP3A-genotyping was performed by capillary polymerase chain reaction followed by fluorescence-based melting curve analysis. A significantly increased SCLC risk for CYP3A4* 1B allele carriers [odds ratio (OR) 2.25, 95% confidence interval (CI) 1.11-4.55, P = 0.02] was found. After dividing cases and controls by gender, an increased lung cancer risk for CYP3A4* 1B carriers (OR 3.04, 95% CI 0.94-9.90, P= 0.06) for women but not for men (OR 1.00, 95% CI 0.56-1.81) was revealed. Heavier smoking men (greater than or equal to 20 pack-years) with the CYP3A4* 1 B allele had a significant OR for lung cancer of 3.42 (95% CI 1.65-7.14, P= 0.001) compared to * 1A/1* 1A carriers with lower tobacco exposure (〈 20 pack-years). For women, the respective OR was 8.00 (95% CI 2.12-30.30, P = 0.005). Genotype frequencies were generally in Hardy-Weinberg equilibrium, except for CYP3A5 where a greater than expected number of CYP3A5* 1 homozygotes was observed among cases (P = 0.006). In addition, we observed linkage disequilibrium of CYP3A4 and CYP3A5 (P 〈 0.00001), but a nonsignificantly increased lung cancer risk was only found for homozygous CYP3A5* 1 allele carriers (OR 5.24,95% CI 0.85-102.28, P = 0.14) but not for heterozygotes. To confirm our observation that the CYP3A4* 1B allele increases SCLC risk and modifies the smoking-related lung cancer risk in a gender-specific manner, further studies, including CYP3A haplotype analysis, will be necessary. Pharmacogenetics 13:607-618 (C) 2003 Lippincott Williams Wilkins
    Type of Publication: Journal article published
    PubMed ID: 14515059
    Signatur Availability
    BibTip Others were also interested in ...
  • 34
    Keywords: PEPTIDE ; human ; DISEASE ; SITE ; SITES ; PROTEIN ; SAMPLE ; SAMPLES ; SERA ; INDUCTION ; BINDING ; treatment ; ACID ; IDENTIFICATION