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  • 1
    Publication Date: 2018-12-15
    Description: Purpose: Poor prognosis in triple-negative breast cancer (TNBC) is due to an aggressive phenotype and lack of biomarker-driven targeted therapies. Overexpression of cyclin E and phosphorylated-CDK2 are correlated with poor survival in patients with TNBC, and the absence of CDK2 desensitizes cells to inhibition of Wee1 kinase, a key cell-cycle regulator. We hypothesize that cyclin E expression can predict response to therapies, which include the Wee1 kinase inhibitor, AZD1775. Experimental Design: Mono- and combination therapies with AZD1775 were evaluated in TNBC cell lines and multiple patient-derived xenograft (PDX) models with different cyclin E expression profiles. The mechanism(s) of cyclin E–mediated replicative stress were investigated following cyclin E induction or CRISPR/Cas9 knockout by a number of assays in multiple cell lines. Results: Cyclin E overexpression (i) is enriched in TNBCs with high recurrence rates, (ii) sensitizes TNBC cell lines and PDX models to AZD1775, (iii) leads to CDK2-dependent activation of DNA replication stress pathways, and (iv) increases Wee1 kinase activity. Moreover, treatment of cells with either CDK2 inhibitors or carboplatin leads to transient transcriptional induction of cyclin E (in cyclin E–low tumors) and result in DNA replicative stress. Such drug-mediated cyclin E induction in TNBC cells and PDX models sensitizes them to AZD1775 in a sequential treatment combination strategy. Conclusions: Cyclin E is a potential biomarker of response (i) for AZD1775 as monotherapy in cyclin E–high TNBC tumors and (ii) for sequential combination therapy with CDK2 inhibitor or carboplatin followed by AZD1775 in cyclin E–low TNBC tumors.
    Print ISSN: 1078-0432
    Electronic ISSN: 1557-3265
    Topics: Medicine
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  • 2
    Publication Date: 2013-07-16
    Description: Folate receptors (FRalpha, FRbeta and FRgamma) are cysteine-rich cell-surface glycoproteins that bind folate with high affinity to mediate cellular uptake of folate. Although expressed at very low levels in most tissues, folate receptors, especially FRalpha, are expressed at high levels in numerous cancers to meet the folate demand of rapidly dividing cells under low folate conditions. The folate dependency of many tumours has been therapeutically and diagnostically exploited by administration of anti-FRalpha antibodies, high-affinity antifolates, folate-based imaging agents and folate-conjugated drugs and toxins. To understand how folate binds its receptors, we determined the crystal structure of human FRalpha in complex with folic acid at 2.8 A resolution. FRalpha has a globular structure stabilized by eight disulphide bonds and contains a deep open folate-binding pocket comprised of residues that are conserved in all receptor subtypes. The folate pteroate moiety is buried inside the receptor, whereas its glutamate moiety is solvent-exposed and sticks out of the pocket entrance, allowing it to be conjugated to drugs without adversely affecting FRalpha binding. The extensive interactions between the receptor and ligand readily explain the high folate-binding affinity of folate receptors and provide a template for designing more specific drugs targeting the folate receptor system.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chen, Chen -- Ke, Jiyuan -- Zhou, X Edward -- Yi, Wei -- Brunzelle, Joseph S -- Li, Jun -- Yong, Eu-Leong -- Xu, H Eric -- Melcher, Karsten -- R01 DK071662/DK/NIDDK NIH HHS/ -- R01 GM102545/GM/NIGMS NIH HHS/ -- England -- Nature. 2013 Aug 22;500(7463):486-9. doi: 10.1038/nature12327. Epub 2013 Jul 14.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Program for Structural Biology and Drug Discovery, Van Andel Research Institute, 333 Bostwick Avenue North East, Grand Rapids, Michigan 49503, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23851396" target="_blank"〉PubMed〈/a〉
    Keywords: Binding Sites/genetics ; Crystallography, X-Ray ; Folate Receptor 1/*chemistry/genetics/*metabolism ; Folic Acid/chemistry/*metabolism ; Humans ; Ligands ; Models, Molecular ; Mutation ; Protein Binding ; Structure-Activity Relationship
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 3
    Publication Date: 2013-12-18
    Description: Strigolactones (SLs) are a group of newly identified plant hormones that control plant shoot branching. SL signalling requires the hormone-dependent interaction of DWARF 14 (D14), a probable candidate SL receptor, with DWARF 3 (D3), an F-box component of the Skp-Cullin-F-box (SCF) E3 ubiquitin ligase complex. Here we report the characterization of a dominant SL-insensitive rice (Oryza sativa) mutant dwarf 53 (d53) and the cloning of D53, which encodes a substrate of the SCF(D3) ubiquitination complex and functions as a repressor of SL signalling. Treatments with GR24, a synthetic SL analogue, cause D53 degradation via the proteasome in a manner that requires D14 and the SCF(D3) ubiquitin ligase, whereas the dominant form of D53 is resistant to SL-mediated degradation. Moreover, D53 can interact with transcriptional co-repressors known as TOPLESS-RELATED PROTEINS. Our results suggest a model of SL signalling that involves SL-dependent degradation of the D53 repressor mediated by the D14-D3 complex.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jiang, Liang -- Liu, Xue -- Xiong, Guosheng -- Liu, Huihui -- Chen, Fulu -- Wang, Lei -- Meng, Xiangbing -- Liu, Guifu -- Yu, Hong -- Yuan, Yundong -- Yi, Wei -- Zhao, Lihua -- Ma, Honglei -- He, Yuanzheng -- Wu, Zhongshan -- Melcher, Karsten -- Qian, Qian -- Xu, H Eric -- Wang, Yonghong -- Li, Jiayang -- England -- Nature. 2013 Dec 19;504(7480):401-5. doi: 10.1038/nature12870. Epub 2013 Dec 11.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] State Key Laboratory of Plant Genomics and National Center for Plant Gene Research (Beijing), Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China [2]. ; State Key Laboratory of Plant Genomics and National Center for Plant Gene Research (Beijing), Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China. ; VARI-SIMM Center, Center for Structure and Function of Drug Targets, CAS-Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China. ; Laboratory of Structural Sciences, Van Andel Research Institute, 333 Bostwick Avenue Northeast, Grand Rapids, Michigan 49503, USA. ; State Key Laboratory of Rice Biology, China National Rice Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou 310006, China. ; 1] VARI-SIMM Center, Center for Structure and Function of Drug Targets, CAS-Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China [2] Laboratory of Structural Sciences, Van Andel Research Institute, 333 Bostwick Avenue Northeast, Grand Rapids, Michigan 49503, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24336200" target="_blank"〉PubMed〈/a〉
    Keywords: Cloning, Molecular ; Gene Expression Regulation, Plant ; Lactones/*antagonists & inhibitors/*metabolism ; Models, Biological ; Multiprotein Complexes/chemistry/metabolism ; Mutation/genetics ; Oryza/genetics/*metabolism ; Plant Growth Regulators/antagonists & inhibitors/*metabolism ; Plant Proteins/chemistry/genetics/*metabolism ; Proteasome Endopeptidase Complex/metabolism ; Protein Binding ; Proteolysis ; *Signal Transduction ; Ubiquitin/metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 4
    Publication Date: 2012-08-28
    Description: Cancer cells must satisfy the metabolic demands of rapid cell growth within a continually changing microenvironment. We demonstrated that the dynamic posttranslational modification of proteins by O-linked beta-N-acetylglucosamine (O-GlcNAcylation) is a key metabolic regulator of glucose metabolism. O-GlcNAcylation was induced at serine 529 of phosphofructokinase 1 (PFK1) in response to hypoxia. Glycosylation inhibited PFK1 activity and redirected glucose flux through the pentose phosphate pathway, thereby conferring a selective growth advantage on cancer cells. Blocking glycosylation of PFK1 at serine 529 reduced cancer cell proliferation in vitro and impaired tumor formation in vivo. These studies reveal a previously uncharacterized mechanism for the regulation of metabolic pathways in cancer and a possible target for therapeutic intervention.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3534962/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3534962/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yi, Wen -- Clark, Peter M -- Mason, Daniel E -- Keenan, Marie C -- Hill, Collin -- Goddard, William A 3rd -- Peters, Eric C -- Driggers, Edward M -- Hsieh-Wilson, Linda C -- R01 GM084724/GM/NIGMS NIH HHS/ -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2012 Aug 24;337(6097):975-80. doi: 10.1126/science.1222278.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22923583" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylglucosamine/metabolism ; Acylation ; Adenosine Triphosphate/metabolism ; Animals ; Cell Hypoxia ; Cell Line ; Cell Line, Tumor ; *Cell Proliferation ; Glucose/*metabolism ; Glycolysis ; Glycosylation ; Humans ; Lactic Acid/metabolism ; Mice ; Mice, Nude ; N-Acetylglucosaminyltransferases/genetics/metabolism ; NADP/metabolism ; Neoplasms/*metabolism/*pathology ; Pentose Phosphate Pathway ; Phosphofructokinase-1, Liver Type/antagonists & inhibitors/chemistry/*metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
    Publication Date: 2015-02-27
    Description: So far, roughly 40 quasars with redshifts greater than z = 6 have been discovered. Each quasar contains a black hole with a mass of about one billion solar masses (10(9) M Sun symbol). The existence of such black holes when the Universe was less than one billion years old presents substantial challenges to theories of the formation and growth of black holes and the coevolution of black holes and galaxies. Here we report the discovery of an ultraluminous quasar, SDSS J010013.02+280225.8, at redshift z = 6.30. It has an optical and near-infrared luminosity a few times greater than those of previously known z 〉 6 quasars. On the basis of the deep absorption trough on the blue side of the Lyman-alpha emission line in the spectrum, we estimate the proper size of the ionized proximity zone associated with the quasar to be about 26 million light years, larger than found with other z 〉 6.1 quasars with lower luminosities. We estimate (on the basis of a near-infrared spectrum) that the black hole has a mass of approximately 1.2 x 10(10) M Sun symbol, which is consistent with the 1.3 x 10(10) M Sun symbol derived by assuming an Eddington-limited accretion rate.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wu, Xue-Bing -- Wang, Feige -- Fan, Xiaohui -- Yi, Weimin -- Zuo, Wenwen -- Bian, Fuyan -- Jiang, Linhua -- McGreer, Ian D -- Wang, Ran -- Yang, Jinyi -- Yang, Qian -- Thompson, David -- Beletsky, Yuri -- England -- Nature. 2015 Feb 26;518(7540):512-5. doi: 10.1038/nature14241.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] Department of Astronomy, School of Physics, Peking University, Beijing 100871, China [2] Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China. ; 1] Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China [2] Steward Observatory, University of Arizona, Tucson, Arizona 85721-0065, USA. ; 1] Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China [2] University of Chinese Academy of Sciences, Beijing 100049, China [3] Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China. ; Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China. ; Mount Stromlo Observatory, Research School of Astronomy and Astrophysics, Australian National University, Weston Creek, Australian Capital Territory 2611, Australia. ; Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China. ; Steward Observatory, University of Arizona, Tucson, Arizona 85721-0065, USA. ; Large Binocular Telescope Observatory, University of Arizona, Tucson, Arizona 85721, USA. ; Las Campanas Observatory, Carnegie Institution of Washington, Colina el Pino, Casilla 601, La Serena, Chile.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25719667" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 6
    ISSN: 0168-583X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 0168-9002
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Surface & Coatings Technology 46 (1991), S. 255-263 
    ISSN: 0257-8972
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 0305-0491
    Keywords: Chymotrypsin-like ; Coelomic fluid ; Coelomocytes ; Latency ; Lumbricus rubellus ; Poly-l-lysine ; Proteolysis ; Serine protease
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0012-821X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
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