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The Pdx1-Bound Swi/Snf Chromatin Remodeling Complex Regulates Pancreatic Progenitor Cell Proliferation and Mature Islet β-Cell Function.
Spaeth JM, Liu JH, Peters D, Guo M, Osipovich AB, Mohammadi F, Roy N, Bhushan A, Magnuson MA, Hebrok M, Wright CVE, Stein R
(2019) Diabetes 68: 1806-1818
MeSH Terms: Animals, Cell Proliferation, Chromatin Assembly and Disassembly, DNA Helicases, Gene Expression Regulation, Glucose Intolerance, Homeodomain Proteins, Insulin, Insulin-Secreting Cells, Mice, Mice, Transgenic, Nuclear Proteins, Pancreas, Trans-Activators, Transcription Factors
Show Abstract · Added June 28, 2019
Transcription factors positively and/or negatively impact gene expression by recruiting coregulatory factors, which interact through protein-protein binding. Here we demonstrate that mouse pancreas size and islet β-cell function are controlled by the ATP-dependent Swi/Snf chromatin remodeling coregulatory complex that physically associates with Pdx1, a diabetes-linked transcription factor essential to pancreatic morphogenesis and adult islet cell function and maintenance. Early embryonic deletion of just the Swi/Snf Brg1 ATPase subunit reduced multipotent pancreatic progenitor cell proliferation and resulted in pancreas hypoplasia. In contrast, removal of both Swi/Snf ATPase subunits, Brg1 and Brm, was necessary to compromise adult islet β-cell activity, which included whole-animal glucose intolerance, hyperglycemia, and impaired insulin secretion. Notably, lineage-tracing analysis revealed Swi/Snf-deficient β-cells lost the ability to produce the mRNAs for and other key metabolic genes without effecting the expression of many essential islet-enriched transcription factors. Swi/Snf was necessary for Pdx1 to bind to the gene enhancer, demonstrating the importance of this association in mediating chromatin accessibility. These results illustrate how fundamental the Pdx1:Swi/Snf coregulator complex is in the pancreas, and we discuss how disrupting their association could influence type 1 and type 2 diabetes susceptibility.
© 2019 by the American Diabetes Association.
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15 MeSH Terms
Direct reprogramming to human nephron progenitor-like cells using inducible piggyBac transposon expression of SNAI2-EYA1-SIX1.
Vanslambrouck JM, Woodard LE, Suhaimi N, Williams FM, Howden SE, Wilson SB, Lonsdale A, Er PX, Li J, Maksimovic J, Oshlack A, Wilson MH, Little MH
(2019) Kidney Int 95: 1153-1166
MeSH Terms: Cells, Cultured, Cellular Reprogramming, DNA Transposable Elements, Gene Transfer Techniques, Genetic Engineering, Homeodomain Proteins, Humans, Intracellular Signaling Peptides and Proteins, Nephrons, Nuclear Proteins, Primary Cell Culture, Protein Tyrosine Phosphatases, Regeneration, Snail Family Transcription Factors
Show Abstract · Added March 28, 2019
All nephrons in the mammalian kidney arise from a transient nephron progenitor population that is lost close to the time of birth. The generation of new nephron progenitors and their maintenance in culture are central to the success of kidney regenerative strategies. Using a lentiviral screening approach, we previously generated a human induced nephron progenitor-like state in vitro using a pool of six transcription factors. Here, we sought to develop a more efficient approach for direct reprogramming of human cells that could be applied in vivo. PiggyBac transposons are a non-viral integrating gene delivery system that is suitable for in vivo use and allows for simultaneous delivery of multiple genes. Using an inducible piggyBac transposon system, we optimized a protocol for the direct reprogramming of HK2 cells to induced nephron progenitor-like cells with expression of only 3 transcription factors (SNAI2, EYA1, and SIX1). Culture in conditions supportive of the nephron progenitor state further increased the expression of nephron progenitor genes. The refined protocol was then applied to primary human renal epithelial cells, which integrated into developing nephron structures in vitro and in vivo. Such inducible reprogramming to nephron progenitor-like cells could facilitate direct cellular reprogramming for kidney regeneration.
Copyright © 2019 International Society of Nephrology. All rights reserved.
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14 MeSH Terms
Dual inhibition of endothelial miR-92a-3p and miR-489-3p reduces renal injury-associated atherosclerosis.
Wiese CB, Zhong J, Xu ZQ, Zhang Y, Ramirez Solano MA, Zhu W, Linton MF, Sheng Q, Kon V, Vickers KC
(2019) Atherosclerosis 282: 121-131
MeSH Terms: Adaptor Proteins, Signal Transducing, Animals, Aorta, Atherosclerosis, Cell Line, Disease Models, Animal, Endothelium, Vascular, Female, Gene Expression Regulation, HEK293 Cells, Humans, Kidney Diseases, Mice, Mice, Knockout, ApoE, MicroRNAs, Nephrectomy, Nuclear Proteins, Phenotype, Phosphorylation, RNA, Small Interfering, STAT3 Transcription Factor, Signal Transduction, Transcriptome, Transforming Growth Factor beta
Show Abstract · Added April 10, 2019
BACKGROUND AND AIMS - Cardiovascular disease (CVD) is the leading cause of death in chronic kidney disease (CKD) patients, however, the underlying mechanisms that link CKD and CVD are not fully understood and limited treatment options exist in this high-risk population. microRNAs (miRNA) are critical regulators of gene expression for many biological processes in atherosclerosis, including endothelial dysfunction and inflammation. We hypothesized that renal injury-induced endothelial miRNAs promote atherosclerosis. Here, we demonstrate that dual inhibition of endothelial miRNAs inhibits atherosclerosis in the setting of renal injury.
METHODS - Aortic endothelial miRNAs were analyzed in apolipoprotein E-deficient (Apoe) mice with renal damage (5/6 nephrectomy, 5/6Nx) by real-time PCR. Endothelial miR-92a-3p and miR-489-3p were inhibited by locked-nucleic acid (LNA) miRNA inhibitors complexed to HDL.
RESULTS - Renal injury significantly increased endothelial miR-92a-3p levels in Apoe;5/6Nx mice. Dual inhibition of miR-92a-3p and miR-489-3p in Apoe;5/6Nx with a single injection of HDL + LNA inhibitors significantly reduced atherosclerotic lesion area by 28.6% compared to HDL + LNA scramble (LNA-Scr) controls. To examine the impact of dual LNA treatment on aortic endothelial gene expression, total RNA sequencing was completed, and multiple putative target genes and pathways were identified to be significantly altered, including the STAT3 immune response pathway. Among the differentially expressed genes, Tgfb2 and Fam220a were identified as putative targets of miR-489-3p and miR-92a-3p, respectively. Both Tgfb2 and Fam220a were significantly increased in aortic endothelium after miRNA inhibition in vivo compared to HDL + LNA-Scr controls. Furthermore, Tgfb2 and Fam220a were validated with gene reporter assays as direct targets of miR-489-3p and miR-92a-3p, respectively. In human coronary artery endothelial cells, over-expression and inhibition of miR-92a-3p decreased and increased FAM220A expression, respectively. Moreover, miR-92a-3p overexpression increased STAT3 phosphorylation, likely through direct regulation of FAM220A, a negative regulator of STAT3 phosphorylation.
CONCLUSIONS - These results support endothelial miRNAs as therapeutic targets and dual miRNA inhibition as viable strategy to reduce CKD-associated atherosclerosis.
Copyright © 2019. Published by Elsevier B.V.
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24 MeSH Terms
Molecular and epidemiologic characterization of Wilms tumor from Baghdad, Iraq.
Phelps HM, Al-Jadiry MF, Corbitt NM, Pierce JM, Li B, Wei Q, Flores RR, Correa H, Uccini S, Frangoul H, Alsaadawi AR, Al-Badri SAF, Al-Darraji AF, Al-Saeed RM, Al-Hadad SA, Lovvorn Iii HN
(2018) World J Pediatr 14: 585-593
MeSH Terms: Adaptor Proteins, Signal Transducing, Child, Preschool, DNA Topoisomerases, Type II, Female, Homeodomain Proteins, Humans, Immunohistochemistry, Infant, Insulin-Like Growth Factor II, Iraq, Kidney Neoplasms, Male, Multiplex Polymerase Chain Reaction, Mutation, N-Myc Proto-Oncogene Protein, Nerve Tissue Proteins, Neural Cell Adhesion Molecules, Nuclear Proteins, Poly-ADP-Ribose Binding Proteins, Receptors, Retinoic Acid, Sequence Analysis, DNA, Transcription Factors, Tumor Suppressor Protein p53, Tumor Suppressor Proteins, WT1 Proteins, Wilms Tumor, beta Catenin
Show Abstract · Added January 28, 2019
BACKGROUND - Wilms tumor (WT) is the most common childhood kidney cancer worldwide, yet its incidence and clinical behavior vary according to race and access to adequate healthcare resources. To guide and streamline therapy in the war-torn and resource-constrained city of Baghdad, Iraq, we conducted a first-ever molecular analysis of 20 WT specimens to characterize the biological features of this lethal disease within this challenged population.
METHODS - Next-generation sequencing of ten target genes associated with WT development and treatment resistance (WT1, CTNNB1, WTX, IGF2, CITED1, SIX2, p53, N-MYC, CRABP2, and TOP2A) was completed. Immunohistochemistry was performed for 6 marker proteins of WT (WT1, CTNNB1, NCAM, CITED1, SIX2, and p53). Patient outcomes were compiled.
RESULTS - Mutations were detected in previously described WT "hot spots" (e.g., WT1 and CTNNB1) as well as novel loci that may be unique to the Iraqi population. Immunohistochemistry showed expression domains most typical of blastemal-predominant WT. Remarkably, despite the challenges facing families and care providers, only one child, with combined WT1 and CTNNB1 mutations, was confirmed dead from disease. Median clinical follow-up was 40.5 months (range 6-78 months).
CONCLUSIONS - These data suggest that WT biology within a population of Iraqi children manifests features both similar to and unique from disease variants in other regions of the world. These observations will help to risk stratify WT patients living in this difficult environment to more or less intensive therapies and to focus treatment on cell-specific targets.
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27 MeSH Terms
Emerin Deregulation Links Nuclear Shape Instability to Metastatic Potential.
Reis-Sobreiro M, Chen JF, Novitskaya T, You S, Morley S, Steadman K, Gill NK, Eskaros A, Rotinen M, Chu CY, Chung LWK, Tanaka H, Yang W, Knudsen BS, Tseng HR, Rowat AC, Posadas EM, Zijlstra A, Di Vizio D, Freeman MR
(2018) Cancer Res 78: 6086-6097
MeSH Terms: Animals, Apoptosis, Biomarkers, Tumor, Cell Line, Tumor, Cell Movement, Cell Nucleus, Disease Progression, Gene Expression Regulation, Neoplastic, Humans, Male, Membrane Proteins, Mice, Mice, SCID, Neoplasm Invasiveness, Neoplasm Metastasis, Neoplastic Cells, Circulating, Nuclear Envelope, Nuclear Proteins, Prostatic Neoplasms
Show Abstract · Added April 10, 2019
Abnormalities in nuclear shape are a well-known feature of cancer, but their contribution to malignant progression remains poorly understood. Here, we show that depletion of the cytoskeletal regulator, Diaphanous-related formin 3 (DIAPH3), or the nuclear membrane-associated proteins, lamin A/C, in prostate and breast cancer cells, induces nuclear shape instability, with a corresponding gain in malignant properties, including secretion of extracellular vesicles that contain genomic material. This transformation is characterized by a reduction and/or mislocalization of the inner nuclear membrane protein, emerin. Consistent with this, depletion of emerin evokes nuclear shape instability and promotes metastasis. By visualizing emerin localization, evidence for nuclear shape instability was observed in cultured tumor cells, in experimental models of prostate cancer, in human prostate cancer tissues, and in circulating tumor cells from patients with metastatic disease. Quantitation of emerin mislocalization discriminated cancer from benign tissue and correlated with disease progression in a prostate cancer cohort. Taken together, these results identify emerin as a mediator of nuclear shape stability in cancer and show that destabilization of emerin can promote metastasis. This study identifies a novel mechanism integrating the control of nuclear structure with the metastatic phenotype, and our inclusion of two types of human specimens (cancer tissues and circulating tumor cells) demonstrates direct relevance to human cancer. http://cancerres.aacrjournals.org/content/canres/78/21/6086/F1.large.jpg .
©2018 American Association for Cancer Research.
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19 MeSH Terms
Nuclear-Mitochondrial interactions influence susceptibility to HIV-associated neurocognitive impairment.
Smieszek S, Jia P, Samuels DC, Zhao Z, Barnholtz-Sloan J, Kaur H, Letendre S, Ellis R, Franklin DR, Hulgan T, Kallianpur A, Bush WS, CHARTER Study Group
(2019) Mitochondrion 46: 247-255
MeSH Terms: AIDS Dementia Complex, Cell Nucleus, Continental Population Groups, Genetic Association Studies, HIV Infections, Haplotypes, Humans, Mitochondria, Mitochondrial Proteins, Nuclear Proteins, Polymorphism, Single Nucleotide, Prospective Studies
Show Abstract · Added December 11, 2019
HIV-associated neurocognitive impairment (NCI) is a term established to capture a wide spectrum of HIV related neurocognitive deficits ranging in severity from asymptomatic to dementia. The genetic underpinnings of this complex phenotype are incompletely understood. Mitochondrial function has long been thought to play a role in neurodegeneration, along with iron metabolism and transport. In this work, we aimed to characterize the interplay of mitochondrial DNA (mtDNA) haplogroup and nuclear genetic associations to NCI phenotypes in the CHARTER cohort, encompassing 1025 individuals of European-descent, African-descent, or admixed Hispanic. We first employed a polygenic modeling approach to investigate the global effect of previous marginally associated nuclear SNPs, and to examine how the polygenic effect of these SNPs is influenced by mtDNA haplogroups. We see evidence of a significant interaction between nuclear SNPs en masse and mtDNA haplogroups within European-descent and African-descent individuals. Subsequently, we performed an analysis of each SNP by mtDNA haplogroup, and detected significant interactions between two nuclear SNPs (rs17160128 and rs12460243) and European haplogroups. These findings, which require validation in larger cohorts, indicate a potential new role for nuclear-mitochondrial DNA interactions in susceptibility to NCI and shed light onto the pathophysiology of this neurocognitive phenotype.
Copyright © 2018 The Authors. Published by Elsevier B.V. All rights reserved.
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The BRG1/SOX9 axis is critical for acinar cell-derived pancreatic tumorigenesis.
Tsuda M, Fukuda A, Roy N, Hiramatsu Y, Leonhardt L, Kakiuchi N, Hoyer K, Ogawa S, Goto N, Ikuta K, Kimura Y, Matsumoto Y, Takada Y, Yoshioka T, Maruno T, Yamaga Y, Kim GE, Akiyama H, Ogawa S, Wright CV, Saur D, Takaori K, Uemoto S, Hebrok M, Chiba T, Seno H
(2018) J Clin Invest 128: 3475-3489
MeSH Terms: Animals, Carcinoma, Pancreatic Ductal, Cell Transformation, Neoplastic, DNA Helicases, Female, Gene Expression Regulation, Humans, Male, Mice, Mice, Transgenic, Nuclear Proteins, Pancreatic Neoplasms, Response Elements, SOX9 Transcription Factor, Signal Transduction, Transcription Factors, Tumor Suppressor Protein p53
Show Abstract · Added August 7, 2018
Chromatin remodeler Brahma related gene 1 (BRG1) is silenced in approximately 10% of human pancreatic ductal adenocarcinomas (PDAs). We previously showed that BRG1 inhibits the formation of intraductal pancreatic mucinous neoplasm (IPMN) and that IPMN-derived PDA originated from ductal cells. However, the role of BRG1 in pancreatic intraepithelial neoplasia-derived (PanIN-derived) PDA that originated from acinar cells remains elusive. Here, we found that exclusive elimination of Brg1 in acinar cells of Ptf1a-CreER; KrasG12D; Brg1fl/fl mice impaired the formation of acinar-to-ductal metaplasia (ADM) and PanIN independently of p53 mutation, while PDA formation was inhibited in the presence of p53 mutation. BRG1 bound to regions of the Sox9 promoter to regulate its expression and was critical for recruitment of upstream regulators, including PDX1, to the Sox9 promoter and enhancer in acinar cells. SOX9 expression was downregulated in BRG1-depleted ADMs/PanINs. Notably, Sox9 overexpression canceled this PanIN-attenuated phenotype in KBC mice. Furthermore, Brg1 deletion in established PanIN by using a dual recombinase system resulted in regression of the lesions in mice. Finally, BRG1 expression correlated with SOX9 expression in human PDAs. In summary, BRG1 is critical for PanIN initiation and progression through positive regulation of SOX9. Thus, the BRG1/SOX9 axis is a potential target for PanIN-derived PDA.
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17 MeSH Terms
The Cancer Genome Atlas Comprehensive Molecular Characterization of Renal Cell Carcinoma.
Ricketts CJ, De Cubas AA, Fan H, Smith CC, Lang M, Reznik E, Bowlby R, Gibb EA, Akbani R, Beroukhim R, Bottaro DP, Choueiri TK, Gibbs RA, Godwin AK, Haake S, Hakimi AA, Henske EP, Hsieh JJ, Ho TH, Kanchi RS, Krishnan B, Kwiatkowski DJ, Lui W, Merino MJ, Mills GB, Myers J, Nickerson ML, Reuter VE, Schmidt LS, Shelley CS, Shen H, Shuch B, Signoretti S, Srinivasan R, Tamboli P, Thomas G, Vincent BG, Vocke CD, Wheeler DA, Yang L, Kim WY, Robertson AG, Cancer Genome Atlas Research Network, Spellman PT, Rathmell WK, Linehan WM
(2018) Cell Rep 23: 313-326.e5
MeSH Terms: Biomarkers, Tumor, Carcinoma, Renal Cell, Cyclin-Dependent Kinase Inhibitor p16, Genome, Human, Humans, Kidney Neoplasms, Metabolic Networks and Pathways, Nuclear Proteins, PTEN Phosphohydrolase, Phenotype, Survival Analysis, Transcription Factors, Tumor Suppressor Proteins, Ubiquitin Thiolesterase
Show Abstract · Added October 30, 2019
Renal cell carcinoma (RCC) is not a single disease, but several histologically defined cancers with different genetic drivers, clinical courses, and therapeutic responses. The current study evaluated 843 RCC from the three major histologic subtypes, including 488 clear cell RCC, 274 papillary RCC, and 81 chromophobe RCC. Comprehensive genomic and phenotypic analysis of the RCC subtypes reveals distinctive features of each subtype that provide the foundation for the development of subtype-specific therapeutic and management strategies for patients affected with these cancers. Somatic alteration of BAP1, PBRM1, and PTEN and altered metabolic pathways correlated with subtype-specific decreased survival, while CDKN2A alteration, increased DNA hypermethylation, and increases in the immune-related Th2 gene expression signature correlated with decreased survival within all major histologic subtypes. CIMP-RCC demonstrated an increased immune signature, and a uniform and distinct metabolic expression pattern identified a subset of metabolically divergent (MD) ChRCC that associated with extremely poor survival.
Published by Elsevier Inc.
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MeSH Terms
ARID1A Maintains Differentiation of Pancreatic Ductal Cells and Inhibits Development of Pancreatic Ductal Adenocarcinoma in Mice.
Kimura Y, Fukuda A, Ogawa S, Maruno T, Takada Y, Tsuda M, Hiramatsu Y, Araki O, Nagao M, Yoshikawa T, Ikuta K, Yoshioka T, Wang Z, Akiyama H, Wright CV, Takaori K, Uemoto S, Chiba T, Seno H
(2018) Gastroenterology 155: 194-209.e2
MeSH Terms: Adenocarcinoma in Situ, Animals, Carcinogenesis, Carcinoma, Pancreatic Ductal, Cell Culture Techniques, Cell Differentiation, DNA-Binding Proteins, Mice, Nuclear Proteins, Pancreatic Ducts, Pancreatic Neoplasms, Proto-Oncogene Proteins p21(ras), SOX9 Transcription Factor
Show Abstract · Added April 3, 2018
BACKGROUND & AIMS - The ARID1A gene encodes a protein that is part of the large adenosine triphosphate (ATP)-dependent chromatin remodeling complex SWI/SNF and is frequently mutated in human pancreatic ductal adenocarcinomas (PDACs). We investigated the functions of ARID1A during formation of PDACs in mice.
METHODS - We performed studies with Ptf1a-Cre;Kras mice, which express activated Kras in the pancreas and develop pancreatic intraepithelial neoplasias (PanINs), as well as those with disruption of Aird1a (Ptf1a-Cre;Kras;Arid1a mice) or disruption of Brg1 (encodes a catalytic ATPase of the SWI/SNF complex) (Ptf1a-Cre;Kras; Brg1mice). Pancreatic ductal cells (PDCs) were isolated from Arid1a mice and from Arid1a;SOX9OE mice, which overexpress human SOX9 upon infection with an adenovirus-expressing Cre recombinase. Pancreatic tissues were collected from all mice and analyzed by histology and immunohistochemistry; cells were isolated and grown in 2-dimensional and 3-dimensional cultures. We performed microarray analyses to compare gene expression patterns in intraductal papillary mucinous neoplasms (IPMNs) from the different strains of mice. We obtained 58 samples of IPMNs and 44 samples of PDACs from patients who underwent pancreatectomy in Japan and analyzed them by immunohistochemistry.
RESULTS - Ptf1a-Cre;Kras mice developed PanINs, whereas Ptf1a-Cre;Kras;Arid1a mice developed IPMNs and PDACs; IPMNs originated from PDCs. ARID1A-deficient IPMNs did not express SOX9. ARID1A-deficient PDCs had reduced expression of SOX9 and dedifferentiated in culture. Overexpression of SOX9 in these cells allowed them to differentiate and prevented dilation of ducts. Among mice with pancreatic expression of activated Kras, those with disruption of Arid1a developed fewer PDACs from IPMNs than mice with disruption of Brg1. ARID1A-deficient IPMNs had reduced activity of the mTOR pathway. Human IPMN and PDAC specimens had reduced levels of ARID1A, SOX9, and phosphorylated S6 (a marker of mTOR pathway activation). Levels of ARID1A correlated with levels of SOX9 and phosphorylated S6.
CONCLUSIONS - ARID1A regulates expression of SOX9, activation of the mTOR pathway, and differentiation of PDCs. ARID1A inhibits formation of PDACs from IPMNs in mice with pancreatic expression of activated KRAS and is down-regulated in IPMN and PDAC tissues from patients.
Copyright © 2018 AGA Institute. Published by Elsevier Inc. All rights reserved.
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13 MeSH Terms
The BET inhibitor INCB054329 reduces homologous recombination efficiency and augments PARP inhibitor activity in ovarian cancer.
Wilson AJ, Stubbs M, Liu P, Ruggeri B, Khabele D
(2018) Gynecol Oncol 149: 575-584
MeSH Terms: Animals, Antineoplastic Combined Chemotherapy Protocols, BRCA1 Protein, Carcinoma, Ovarian Epithelial, Cell Cycle Proteins, Cell Line, Tumor, Down-Regulation, Drug Synergism, Female, Homologous Recombination, Humans, Indoles, Mice, Mice, Inbred NOD, Mice, Nude, Mice, SCID, Neoplasms, Glandular and Epithelial, Nuclear Proteins, Organic Chemicals, Ovarian Neoplasms, Phthalazines, Piperazines, Poly(ADP-ribose) Polymerase Inhibitors, Transcription Factors, Xenograft Model Antitumor Assays
Show Abstract · Added March 3, 2020
OBJECTIVE - Homologous recombination (HR)-proficient ovarian tumors have poorer clinical outcomes and show resistance to poly ADP ribose polymerase inhibitors (PARPi). A subset of HR-proficient ovarian tumors show amplification in bromodomain and extra-terminal (BET) genes such as BRD4. We aimed to test the hypothesis that BRD4 inhibition sensitizes ovarian cancer cells to PARPi by reducing HR efficiency and increasing DNA damage.
METHODS - HR-proficient ovarian cancer cell lines (OVCAR-3, OVCAR-4, SKOV-3, UWB1.289+BRCA1) were treated with BRD4-targeting siRNA, novel (INB054329, INCB057643) and established (JQ1) BET inhibitors (BETi) and PARPi (olaparib, rucaparib). Cell growth and viability were assessed by sulforhodamine B assays in vitro, and in SKOV-3 and ovarian cancer patient-derived xenografts in vivo. DNA damage and repair (pH2AX, RAD51 and BRCA1 foci formation, and DRGFP HR reporter activity), apoptosis markers (cleaved PARP, cleaved caspase-3, Bax) and proliferation markers (PCNA, Ki67) were assessed by immunofluorescence and western blot.
RESULTS - In cultured cells, inhibition of BRD4 by siRNA or INCB054329 reduced expression and function of BRCA1 and RAD51, reduced HR reporter activity, and sensitized the cells to olaparib-induced growth inhibition, DNA damage induction and apoptosis. Synergy was observed between all BETi tested and PARPi. INCB054329 and olaparib also co-operatively inhibited xenograft tumor growth, accompanied by reduced BRCA1 expression and proliferation, and increased apoptosis and DNA damage.
CONCLUSIONS - These results provide strong rationale for using BETi to extend therapeutic efficacy of PARPi to HR-proficient ovarian tumors and could benefit a substantial number of women diagnosed with this devastating disease.
Copyright © 2018 Elsevier Inc. All rights reserved.
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