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https://www.readbyqxmd.com/read/27795446/transcriptional-silencing-of-moloney-murine-leukemia-virus-in-human-embryonic-carcinoma-cells
#1
Gary Z Wang, Stephen P Goff
: Embryonic carcinoma (EC) cells are malignant counterparts of embryonic stem (ES) cells and serve as useful models for investigating cellular differentiation and human embryogenesis. Though the susceptibility of murine EC cells to retroviral infection has been extensively analyzed, few studies of retrovirus infection of human EC cells have been performed. We tested the susceptibility of human EC cells to transduction by retroviral vectors derived from three different retroviral genera...
October 26, 2016: Journal of Virology
https://www.readbyqxmd.com/read/27588518/atm-function-and-its-relationship-with-atm-gene-mutations-in-chronic-lymphocytic-leukemia-with-the-recurrent-deletion-11q22-3-23-2
#2
Y Jiang, H-C Chen, X Su, P A Thompson, X Liu, K-A Do, W Wierda, M J Keating, W Plunkett
Approximately 10-20% of chronic lymphocytic leukemia (CLL) patients exhibit del(11q22-23) before treatment, this cohort increases to over 40% upon progression following chemoimmunotherapy. The coding sequence of the DNA damage response gene, ataxia-telangiectasia-mutated (ATM), is contained in this deletion. The residual ATM allele is frequently mutated, suggesting a relationship between gene function and clinical response. To investigate this possibility, we sought to develop and validate an assay for the function of ATM protein in these patients...
September 2, 2016: Blood Cancer Journal
https://www.readbyqxmd.com/read/26417948/functional-domains-of-zfp809-essential-for-nuclear-localization-and-gene-silencing
#3
Yu Ichida, Yuko Utsunomiya, Toru Yasuda, Kazuhiko Nakabayashi, Toshinori Sato, Masafumi Onodera
Zinc finger protein 809 (ZFP809) is a member of the Kruppel-associated box-containing zinc finger protein (KRAB-ZFP) family, and is highly expressed in mouse immature cells. ZFP809 is known to inhibit the expression of transduced genes driven by Moloney murine leukemia virus (MoMLV)-typed retroviral vectors by binding to the primer binding site (PBS) located downstream of the MLV-long terminal repeat (LTR) of the vectors and recruiting protein complexes that introduce epigenetic silencing marks such as histone modifications and DNA methylation at the MLV-LTR...
2015: PloS One
https://www.readbyqxmd.com/read/24991018/ectopic-dnmt3l-triggers-assembly-of-a-repressive-complex-for-retroviral-silencing-in-somatic-cells
#4
Tzu-Hao Kao, Hung-Fu Liao, Daniel Wolf, Kang-Yu Tai, Ching-Yu Chuang, Hsuan-Shu Lee, Hung-Chih Kuo, Kenichiro Hata, Xing Zhang, Xiaodong Cheng, Stephen P Goff, Steen K T Ooi, Timothy H Bestor, Shau-Ping Lin
UNLABELLED: Mammalian genomes are replete with retrotransposable elements, including endogenous retroviruses. DNA methyltransferase 3-like (DNMT3L) is an epigenetic regulator expressed in prospermatogonia, growing oocytes, and embryonic stem (ES) cells. Here, we demonstrate that DNMT3L enhances the interaction of repressive epigenetic modifiers, including histone deacetylase 1 (HDAC1), SET domain, bifurcated 1 (SETDB1), DNA methyltransferase 3A (DNMT3A), and tripartite motif-containing protein 28 (TRIM28; also known as TIF1β and KAP1) in ES cells and orchestrates retroviral silencing activity with TRIM28 through mechanisms including, but not limited to, de novo DNA methylation...
September 2014: Journal of Virology
https://www.readbyqxmd.com/read/24907272/an-arginine-rich-motif-of-ring-finger-protein-4-rnf4-oversees-the-recruitment-and-degradation-of-the-phosphorylated-and-sumoylated-kr%C3%A3-ppel-associated-box-domain-associated-protein-1-kap1-trim28-protein-during-genotoxic-stress
#5
Ching-Ying Kuo, Xu Li, Xiang-Qian Kong, Cheng Luo, Che-Chang Chang, Yiyin Chung, Hsiu-Ming Shih, Keqin Kathy Li, David K Ann
Krüppel-associated box domain-associated protein 1 (KAP1) is a universal transcriptional corepressor that undergoes multiple posttranslational modifications (PTMs), including SUMOylation and Ser-824 phosphorylation. However, the functional interplay of KAP1 PTMs in regulating KAP1 turnover during DNA damage response remains unclear. To decipher the role and cross-talk of multiple KAP1 PTMs, we show here that DNA double strand break-induced KAP1 Ser-824 phosphorylation promoted the recruitment of small ubiquitin-like modifier (SUMO)-targeted ubiquitin E3 ligase, ring finger protein 4 (RNF4), and subsequent RNF4-mediated, SUMO-dependent degradation...
July 25, 2014: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/24836891/stat3-activated-gm-csfr%C3%AE-translocates-to-the-nucleus-and-protects-cll-cells-from-apoptosis
#6
Ping Li, David Harris, Zhiming Liu, Uri Rozovski, Alessandra Ferrajoli, Yongtao Wang, Carlos Bueso-Ramos, Inbal Hazan-Halevy, Srdana Grgurevic, William Wierda, Jan Burger, Susan O'Brien, Stefan Faderl, Michael Keating, Zeev Estrov
UNLABELLED: Here, it was determined that chronic lymphocytic leukemia (CLL) cells express the α subunit, but not the β subunit, of the granulocyte-macrophage colony-stimulating factor receptor (GM-CSFR/CSF2R). GM-CSFRα was detected on the surface, in the cytosol, and in the nucleus of CLL cells via confocal microscopy, cell fractionation, and GM-CSFRα antibody epitope mapping. Because STAT3 is frequently activated in CLL and the GM-CSFRα promoter harbors putative STAT3 consensus binding sites, MM1 cells were transfected with truncated forms of the GM-CSFRα promoter, then stimulated with IL6 to activate STAT3 and to identify STAT3-binding sites...
September 2014: Molecular Cancer Research: MCR
https://www.readbyqxmd.com/read/22023523/synergistic-cytotoxicity-of-the-dna-alkylating-agent-busulfan-nucleoside-analogs-and-suberoylanilide-hydroxamic-acid-in-lymphoma-cell-lines
#7
Benigno C Valdez, David Murray, Yago Nieto, Yang Li, Guiyun Wang, Richard E Champlin, Borje S Andersson
Hematopoietic stem cell transplant (HSCT) is a promising treatment for lymphomas. Its success depends on effective pre-transplant conditioning regimens. We previously reported on the efficacy of DNA alkylating agent-nucleoside analog (NA) combinations for conditioning in acute myeloid leukemia (AML). We hypothesized that a similar combinatory approach can be used for lymphomas. A combination of busulfan (Bu) with two NAs - clofarabine (Clo), fludarabine (Flu) or gemcitabine (Gem) - resulted in synergistic cytotoxicity in lymphoma cell lines...
May 2012: Leukemia & Lymphoma
https://www.readbyqxmd.com/read/21228624/kap1-depletion-increases-pml-nuclear-body-number-in-concert-with-ultrastructural-changes-in-chromatin
#8
Rosemarie Kepkay, Kathleen M Attwood, Yael Ziv, Yosef Shiloh, Graham Dellaire
The promyelocytic leukemia (PML) protein is the main structural component of subnuclear domains termed PML nuclear bodies (PML NBs), which are implicated in tumor suppression by regulating apoptosis, cell senescence, and DNA repair. Previously, we demonstrated that ATM kinase can regulate changes in PML NB number in response to DNA double-strand breaks (DSBs). PML NBs make extensive contacts with chromatin and ATM mediates DNA damage-dependent changes in chromatin structure in part by the phosphorylation of the KRAB-associated protein 1 (KAP1) at S824...
January 15, 2011: Cell Cycle
https://www.readbyqxmd.com/read/20075919/kap1-controls-endogenous-retroviruses-in-embryonic-stem-cells
#9
Helen M Rowe, Johan Jakobsson, Daniel Mesnard, Jacques Rougemont, Séverine Reynard, Tugce Aktas, Pierre V Maillard, Hillary Layard-Liesching, Sonia Verp, Julien Marquis, François Spitz, Daniel B Constam, Didier Trono
More than forty per cent of the mammalian genome is derived from retroelements, of which about one-quarter are endogenous retroviruses (ERVs). Some are still active, notably in mice the highly polymorphic early transposon (ETn)/MusD and intracisternal A-type particles (IAP). ERVs are transcriptionally silenced during early embryogenesis by histone and DNA methylation (and reviewed in ref. 7), although the initiators of this process, which is essential to protect genome integrity, remain largely unknown. KAP1 (KRAB-associated protein 1, also known as tripartite motif-containing protein 28, TRIM28) represses genes by recruiting the histone methyltransferase SETDB1, heterochromatin protein 1 (HP1) and the NuRD histone deacetylase complex, but few of its physiological targets are known...
January 14, 2010: Nature
https://www.readbyqxmd.com/read/18281035/negative-regulation-of-the-wnt-signal-by-mm-1-through-inhibiting-expression-of-the-wnt4-gene
#10
Tatsuya Yoshida, Hirotake Kitaura, Yuko Hagio, Toshiya Sato, Sanae M M Iguchi-Ariga, Hiroyoshi Ariga
We have reported that a novel c-Myc-binding protein, MM-1, repressed the E-box-dependent transcription activity of c-Myc through TIF1beta/KAP1, a transcriptional corepressor, and that the c-fms gene was a target gene involved in this pathway. We have also reported that a mutation of A157R in MM-1, which is often observed in patients with leukemia or lymphoma, abrogated all of the repressive activities of MM-1 toward c-Myc, indicating that MM-1 is a novel tumor suppressor. In this study, to further identify target genes of MM-1, DNA microarray analysis was carried out by comparing expression levels of genes in MM-1 knockdown and parental cells, and the wnt4 gene, a member of the Wnt-beta-catenin pathway, was identified as a target gene of MM-1...
April 1, 2008: Experimental Cell Research
https://www.readbyqxmd.com/read/17786314/mm-1-facilitates-degradation-of-c-myc-by-recruiting-proteasome-and-a-novel-ubiquitin-e3-ligase
#11
Yumiko Kimura, Arisa Nagao, Yuko Fujioka, Akiko Satou, Takahiro Taira, Sanae M M Iguchi-Ariga, Hiroyoshi Ariga
We have reported that a novel c-Myc-binding protein, MM-1, repressed the E-box-dependent transcription activity of c-Myc by recruiting the HDAC1 complex via TIF1beta/KAP1, a transcriptional corepressor. We have also reported that a mutation of A157R in MM-1, which is often observed in patients with leukemia or lymphoma, abrogated all of the repressive activities of MM-1 toward c-Myc, indicating that MM-1 is a novel tumor suppressor. In this study, we found that MM-1 was bound to a component of proteasome and stimulated degradation of c-Myc in human cells...
October 2007: International Journal of Oncology
https://www.readbyqxmd.com/read/16412420/pml-associated-repressor-of-transcription-parot-a-novel-krab-zinc-finger-repressor-is-regulated-through-association-with-pml-nuclear-bodies
#12
Sandra Fleischer, Stefan Wiemann, Hans Will, Thomas G Hofmann
Promyelocytic leukemia nuclear bodies (PML-NBs) are implicated in transcriptional regulation. Here we identify a novel transcriptional repressor, PML-associated repressor of transcription (PAROT), which is regulated in its repressor activity through recruitment to PML-NBs. PAROT is a Krüppel-associated box ( KRAB) zinc-finger (ZNF) protein, which comprises an amino terminal KRAB-A and KRAB-B box, a linker domain and 8 tandemly repeated C(2)H(2)-ZNF motifs at its carboxy terminus. Consistent with its domain structure, when tethered to DNA, PAROT represses transcription, and this is partially released by the HDAC inhibitor trichostatin A...
April 1, 2006: Experimental Cell Research
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