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  • 1
    Publication Date: 2016-03-17
    Description: Mutations disabling the TP53 tumour suppressor gene represent the most frequent events in human cancer and typically occur through a two-hit mechanism involving a missense mutation in one allele and a 'loss of heterozygosity' deletion encompassing the other. While TP53 missense mutations can also contribute gain-of-function activities that impact tumour progression, it remains unclear whether the deletion event, which frequently includes many genes, impacts tumorigenesis beyond TP53 loss alone. Here we show that somatic heterozygous deletion of mouse chromosome 11B3, a 4-megabase region syntenic to human 17p13.1, produces a greater effect on lymphoma and leukaemia development than Trp53 deletion. Mechanistically, the effect of 11B3 loss on tumorigenesis involves co-deleted genes such as Eif5a and Alox15b (also known as Alox8), the suppression of which cooperates with Trp53 loss to produce more aggressive disease. Our results imply that the selective advantage produced by human chromosome 17p deletion reflects the combined impact of TP53 loss and the reduced dosage of linked tumour suppressor genes.〈br /〉〈br /〉〈a href="" target="_blank"〉〈img src="" border="0"〉〈/a〉   〈a href="" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Liu, Yu -- Chen, Chong -- Xu, Zhengmin -- Scuoppo, Claudio -- Rillahan, Cory D -- Gao, Jianjiong -- Spitzer, Barbara -- Bosbach, Benedikt -- Kastenhuber, Edward R -- Baslan, Timour -- Ackermann, Sarah -- Cheng, Lihua -- Wang, Qingguo -- Niu, Ting -- Schultz, Nikolaus -- Levine, Ross L -- Mills, Alea A -- Lowe, Scott W -- P30 CA008748/CA/NCI NIH HHS/ -- P30 CA016042/CA/NCI NIH HHS/ -- R01 CA190261/CA/NCI NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2016 Mar 24;531(7595):471-5. doi: 10.1038/nature17157. Epub 2016 Mar 16.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Hematology and Department of Liver Surgery, State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University and National Collaborative Innovation Center, Chengdu 610041, China. ; Department of Cancer Biology and Genetics, Memorial Sloan Kettering Cancer Center, New York, New York 10065, USA. ; Institute for Cancer Genetics, Columbia University Medical Center, New York, New York 10032, USA. ; Kravis Center for Molecular Oncology, Memorial Sloan Kettering Cancer Center, New York, New York 10065, USA. ; Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, New York 10065, USA. ; Human Oncology &Pathogenesis Program and Leukemia Service, Memorial Sloan Kettering Cancer Center, New York, New York 10065, USA. ; Department of Hematology &Research Laboratory of Hematology, West China Hospital, Sichuan University, Chengdu 610041, China. ; Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724, USA. ; Howard Hughes Medical Institute, New York, New York 10065, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Animals ; Cell Transformation, Neoplastic/genetics ; Chromosomes, Human, Pair 17/genetics ; Chromosomes, Mammalian/genetics ; Disease Models, Animal ; Disease Progression ; Female ; Genes, p53/*genetics ; Heterozygote ; Humans ; Leukemia, Myeloid, Acute/genetics/pathology ; Lymphoma/genetics/pathology ; Male ; Mice ; Neoplasms/*genetics/*pathology ; Peptide Initiation Factors/genetics/metabolism ; RNA-Binding Proteins/genetics/metabolism ; Sequence Deletion/*genetics ; Synteny/genetics ; Tumor Suppressor Protein p53/*deficiency
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2018-09-04
    Description: Allergic asthma is a chronic inflammatory disease primarily mediated by Th2 immune mechanisms. Numerous studies have suggested that early life exposure to lipopolysaccharide (LPS) is negatively associated with allergic asthma. One proposed mechanism invokes desensitization of lung epithelial cells by LPS. We report here that acyloxyacyl hydrolase (AOAH), a host lipase that degrades and inactivates LPS, renders mice more susceptible to house dust mite (HDM)–induced allergic asthma. Lung epithelial cells from Aoah –/– mice are refractory to HDM stimulation, decreasing dendritic cell activation and Th2 responses. Antibiotic treatment that diminished commensal LPS-producing bacteria normalized Aoah –/– responses to HDM, while giving LPS intrarectally ameliorated asthma. Aoah –/– mouse feces, plasma, and lungs contained more bioactive LPS than did those of Aoah +/+ mice. By inactivating commensal LPS, AOAH thus prevents desensitization of lung epithelial cells. An enzyme that prevents severe lung inflammation/injury in Gram-negative bacterial pneumonia has the seemingly paradoxical effect of predisposing to a Th2-mediated airway disease.
    Keywords: Mucosal Immunology
    Print ISSN: 0022-1007
    Electronic ISSN: 1540-9538
    Topics: Medicine
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  • 3
    Publication Date: 2012-08-28
    Description: Polycomb repressive complex 2 (PRC2)-mediated histone H3 lysine 27 (H3K27) methylation is vital for Polycomb gene silencing, a classic epigenetic phenomenon that maintains transcriptional silencing throughout cell divisions. We report that PRC2 activity is regulated by the density of its substrate nucleosome arrays. Neighboring nucleosomes activate the PRC2 complex with a fragment of their H3 histones (Ala(31) to Arg(42)). We also identified mutations on PRC2 subunit Su(z)12, which impair its binding and response to the activating peptide and its ability in establishing H3K27 trimethylation levels in vivo. In mouse embryonic stem cells, local chromatin compaction occurs before the formation of trimethylated H3K27 upon transcription cessation of the retinoic acid-regulated gene CYP26a1. We propose that PRC2 can sense the chromatin environment to exert its role in the maintenance of transcriptional states.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yuan, Wen -- Wu, Tong -- Fu, Hang -- Dai, Chao -- Wu, Hui -- Liu, Nan -- Li, Xiang -- Xu, Mo -- Zhang, Zhuqiang -- Niu, Tianhui -- Han, Zhifu -- Chai, Jijie -- Zhou, Xianghong Jasmine -- Gao, Shaorong -- Zhu, Bing -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2012 Aug 24;337(6097):971-5. doi: 10.1126/science.1225237.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉College of Biological Sciences, China Agricultural University, Beijing 100094, China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; CD4-Positive T-Lymphocytes ; Chromatin Immunoprecipitation ; Cytochrome P-450 Enzyme System/genetics ; Drosophila Proteins/chemistry/genetics/*metabolism ; Drosophila melanogaster ; Embryonic Stem Cells ; Gene Silencing ; Histone-Lysine N-Methyltransferase/chemistry/genetics/*metabolism ; Histones/chemistry/genetics/*metabolism ; Humans ; Lysine/metabolism ; Methylation ; Mice ; Molecular Sequence Data ; Mutagenesis ; Nucleosomes/*metabolism/ultrastructure ; Peptide Fragments/metabolism ; Polycomb Repressive Complex 2 ; Polycomb-Group Proteins ; Repressor Proteins/chemistry/genetics/*metabolism ; *Transcription, Genetic
    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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  • 4
    Electronic Resource
    Electronic Resource
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 54 (1998), S. 565-567 
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 5
    Publication Date: 2018-04-03
    Description: Our previous study reported that SKLB-23bb, an orally bioavailable HDAC6-selective inhibitor, exhibited superior antitumor efficiency both in vitro and in vivo in comparison with ACY1215, a HDAC6-selective inhibitor recently in phase II clinical trial. This study focused on the mechanism related to the activity of SKLB-23bb. We discovered that despite having HDAC6-selective inhibition equal to ACY1215, SKLB-23bb showed cytotoxic effects against a panel of solid and hematologic tumor cell lines at the low submicromolar level. Interestingly, in contrast to the reported HDAC6-selective inhibitors, SKLB-23bb was more efficient against solid tumor cells. Utilizing HDAC6 stably knockout cell lines constructed by CRISPR–Cas9 gene editing, we illustrated that SKLB-23bb could remain cytotoxic independent of HDAC6 status. Investigation of the mechanism confirmed that SKLB-23bb exerted its cytotoxic activity by additionally targeting microtubules. SKLB-23bb could bind to the colchicine site in β-tubulin and act as a microtubule polymerization inhibitor. Consistent with its microtubule-disrupting ability, SKLB-23bb also blocked tumor cell cycle at G 2 –M phase and triggered cellular apoptosis. In solid tumor xenografts, oral administration of SKLB-23bb efficiently inhibited tumor growth. These results suggested that SKLB-23bb was an orally bioavailable HDAC6 and microtubule dual targeting agent. The microtubule targeting profile enhanced the antitumor activity and expanded the antitumor spectrum of SKLB-23bb, thus breaking through the limitation of HDAC6 inhibitors. Mol Cancer Ther; 17(4); 763–75. ©2018 AACR .
    Print ISSN: 1535-7163
    Electronic ISSN: 1538-8514
    Topics: Medicine
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