51
|
Mizuguchi Y, Specht S, Lunz JG, Isse K, Corbitt N, Takizawa T, Demetris AJ. Cooperation of p300 and PCAF in the control of microRNA 200c/141 transcription and epithelial characteristics. PLoS One 2012; 7:e32449. [PMID: 22384255 PMCID: PMC3284570 DOI: 10.1371/journal.pone.0032449] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2010] [Accepted: 01/30/2012] [Indexed: 01/07/2023] Open
Abstract
Epithelial to mesenchymal transition (EMT) not only occurs during embryonic development and in response to injury, but is an important element in cancer progression. EMT and its reverse process, mesenchymal to epithelial transition (MET) is controlled by a network of transcriptional regulators and can be influenced by posttranscriptional and posttranslational modifications. EMT/MET involves many effectors that can activate and repress these transitions, often yielding a spectrum of cell phenotypes. Recent studies have shown that the miR-200 family and the transcriptional suppressor ZEB1 are important contributors to EMT. Our previous data showed that forced expression of SPRR2a was a powerful inducer of EMT and supports the findings by others that SPRR gene members are highly upregulated during epithelial remodeling in a variety of organs. Here, using SPRR2a cells, we characterize the role of acetyltransferases on the microRNA-200c/141 promoter and their effect on the epithelial/mesenchymal status of the cells. We show that the deacetylase inhibitor TSA as well as P300 and PCAF can cause a shift towards epithelial characteristics in HUCCT-1-SPRR2a cells. We demonstrate that both P300 and PCAF act as cofactors for ZEB1, forming a P300/PCAF/ZEB1 complex on the miR200c/141 promoter. This binding results in lysine acetylation of ZEB1 and a release of ZEB1 suppression on miR-200c/141 transcription. Furthermore, disruption of P300 and PCAF interactions dramatically down regulates miR-200c/141 promoter activity, indicating a PCAF/P300 cooperative function in regulating the transcriptional suppressor/activator role of ZEB1. These data demonstrate a novel mechanism of miRNA regulation in mediating cell phenotype.
Collapse
Affiliation(s)
- Yoshiaki Mizuguchi
- Thomas E. Starzl Transplantation Institute, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, United States of America
- Department of Pathology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, United States of America
| | - Susan Specht
- Thomas E. Starzl Transplantation Institute, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, United States of America
- Department of Pathology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, United States of America
| | - John G. Lunz
- Thomas E. Starzl Transplantation Institute, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, United States of America
- Department of Pathology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, United States of America
- Department of Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, United States of America
| | - Kumiko Isse
- Thomas E. Starzl Transplantation Institute, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, United States of America
- Department of Pathology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, United States of America
| | - Natasha Corbitt
- Thomas E. Starzl Transplantation Institute, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, United States of America
- Department of Pathology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, United States of America
| | - Toshihiro Takizawa
- Department of Molecular Anatomy and Medicine, Nippon Medical School, Tokyo, Japan
| | - Anthony J. Demetris
- Thomas E. Starzl Transplantation Institute, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, United States of America
- Department of Pathology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, United States of America
- * E-mail:
| |
Collapse
|
52
|
Sinha S, Malonia SK, Mittal SPK, Mathai J, Pal JK, Chattopadhyay S. Chromatin remodelling protein SMAR1 inhibits p53 dependent transactivation by regulating acetyl transferase p300. Int J Biochem Cell Biol 2011; 44:46-52. [PMID: 22074660 DOI: 10.1016/j.biocel.2011.10.020] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2011] [Revised: 10/06/2011] [Accepted: 10/25/2011] [Indexed: 12/16/2022]
Abstract
Acetylation of p53 is indispensable for its transcriptional activities and induction of apoptosis upon DNA damage. Here, we show that chromatin remodelling protein SMAR1 inhibits p53 acetylation and p53 dependent apoptosis by repressing p300 expression in response to DNA damage. The repression of p300 expression by SMAR1 is relieved upon treatment with proteosomal inhibitors MG132 and Lactacystin. We demonstrate that SMAR1 interacts with p53-p300 transcriptional complex and SMAR1 overexpression antagonizes p300 interaction with p53 and suppresses activation of p53 apoptotic targets and p53 regulated miRNA miR-34a. Conversely, knockdown of SMAR1 promotes p300 accumulation and p53 acetylation while ectopic expression of p300 rescues SMAR1 inhibition on p53. Collectively, these results indicate that SMAR1 is an important player in p300-p53 regulated DNA damage signalling pathway and can exert its effect on apoptosis in a transcription independent manner.
Collapse
Affiliation(s)
- Surajit Sinha
- National Centre for Cell Science, Pune University Campus, Ganeshkhind, Pune 411007, India
| | | | | | | | | | | |
Collapse
|
53
|
Sterrenburg L, Gaszner B, Boerrigter J, Santbergen L, Bramini M, Roubos EW, Peeters BW, Kozicz T. Sex-dependent and differential responses to acute restraint stress of corticotropin-releasing factor-producing neurons in the rat paraventricular nucleus, central amygdala, and bed nucleus of the stria terminalis. J Neurosci Res 2011; 90:179-92. [DOI: 10.1002/jnr.22737] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2011] [Revised: 06/07/2011] [Accepted: 06/10/2011] [Indexed: 11/09/2022]
|
54
|
Frequent mutations of chromatin remodeling genes in transitional cell carcinoma of the bladder. Nat Genet 2011; 43:875-8. [PMID: 21822268 DOI: 10.1038/ng.907] [Citation(s) in RCA: 570] [Impact Index Per Article: 43.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2011] [Accepted: 07/15/2011] [Indexed: 12/13/2022]
Abstract
Transitional cell carcinoma (TCC) is the most common type of bladder cancer. Here we sequenced the exomes of nine individuals with TCC and screened all the somatically mutated genes in a prevalence set of 88 additional individuals with TCC with different tumor stages and grades. In our study, we discovered a variety of genes previously unknown to be mutated in TCC. Notably, we identified genetic aberrations of the chromatin remodeling genes (UTX, MLL-MLL3, CREBBP-EP300, NCOR1, ARID1A and CHD6) in 59% of our 97 subjects with TCC. Of these genes, we showed UTX to be altered substantially more frequently in tumors of low stages and grades, highlighting its potential role in the classification and diagnosis of bladder cancer. Our results provide an overview of the genetic basis of TCC and suggest that aberration of chromatin regulation might be a hallmark of bladder cancer.
Collapse
|
55
|
Li Y, Yang HX, Luo RZ, Zhang Y, Li M, Wang X, Jia WH. High expression of p300 has an unfavorable impact on survival in resectable esophageal squamous cell carcinoma. Ann Thorac Surg 2011; 91:1531-8. [PMID: 21524463 DOI: 10.1016/j.athoracsur.2010.12.012] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2010] [Revised: 12/07/2010] [Accepted: 12/09/2010] [Indexed: 01/21/2023]
Abstract
BACKGROUND p300 is a transcriptional regulator that is involved in fundamental processes such as cell proliferation, cell differentiation, and tumor progression. However, its role and clinical significance in resectable esophageal squamous cell carcinoma (ESCC) has not been elucidated. The purpose of this study was to explore whether there was a correlation between the expression of p300 by immunohistochemistry and the clinical outcome of a group of patients with ESCC treated with surgical resection. METHODS Tissue microarray that included 240 surgically resected ESCC specimens and 56 cases of paracancerous tissues was successfully generated for immunohistochemical evaluation. The clinical and prognostic significance of p300 expression was analyzed statistically. Kaplan-Meier analysis was used to compare the postoperative survival between groups. RESULTS The expression frequency and expression levels of p300 were significantly higher in ESCC specimens (62.5%, 150 of 240) than in normal esophageal mucosa (8.9%, 5 of 56; p<0.001). Increased p300 expression was associated with higher histologic grade (p=0.012), T category (p=0.032), and N category (p=0.013). Patients with low expression of p300 demonstrated higher overall survival compared with those with high expression of p300 (mean, 80.0 months versus 56.9 months; p<0.001). A similar result was observed for disease-free survival (mean, 78.3 months versus 53.1 months; p<0.001). Furthermore, p300 expression could stratify the patient survival (disease-free survival and overall survival) in stage II (p=0.002, 0.003, respectively). Multivariate analysis showed that the level of p300 expression was an independent prognostic factor in ESCC (relative risk, 1.658; p=0.017). CONCLUSIONS High expression of p300 suggests poor prognosis for patients with resectable ESCC.
Collapse
Affiliation(s)
- Yong Li
- Department of Thoracic Surgery, Sun Yat-sen University Cancer Center, Guangzhou City, Guangdong Province, People's Republic of China
| | | | | | | | | | | | | |
Collapse
|
56
|
Lim EJ, Lu TX, Blanchard C, Rothenberg ME. Epigenetic regulation of the IL-13-induced human eotaxin-3 gene by CREB-binding protein-mediated histone 3 acetylation. J Biol Chem 2011; 286:13193-204. [PMID: 21325281 DOI: 10.1074/jbc.m110.210724] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
The etiology of a variety of chronic inflammatory disorders has been attributed to the interaction of genetic and environmental factors. Herein, we identified a link between epigenetic regulation and IL-13-driven eotaxin-3 in the pathogenesis of chronic allergic inflammation. We first demonstrated that the cAMP-responsive element (CRE) site in the eotaxin-3 promoter affects IL-13-induced eotaxin-3 promoter activity. Furthermore, the CRE-binding protein-binding protein (CBP), a histone acetyltransferase, induced base-line and IL-13-induced eotaxin-3 promoter activity. Additionally, IL-13 treatment promoted global histone 3 acetylation as well as the formation of a complex containing CBP and STAT6 and the subsequent acetylation of histone 3 at the eotaxin-3 promoter. CBP gene silencing decreased IL-13-induced transcription of eotaxin-3. Conversely, inhibition of histone deacetylation increased IL-13-induced eotaxin-3 production. Clinical studies demonstrated markedly increased global acetylation of histone 3 in the inflamed tissue of patients with allergic inflammation. Collectively, these results identify an epigenetic mechanism involving CBP and chromatin remodeling in regulating IL-13-induced chemokine transcription.
Collapse
Affiliation(s)
- Eun Jin Lim
- Division of Allergy and Immunology, Department of Pediatrics, Cincinnati Children’s Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, Ohio 45229, USA
| | | | | | | |
Collapse
|
57
|
Ogiwara H, Ui A, Otsuka A, Satoh H, Yokomi I, Nakajima S, Yasui A, Yokota J, Kohno T. Histone acetylation by CBP and p300 at double-strand break sites facilitates SWI/SNF chromatin remodeling and the recruitment of non-homologous end joining factors. Oncogene 2011; 30:2135-46. [PMID: 21217779 DOI: 10.1038/onc.2010.592] [Citation(s) in RCA: 227] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Non-homologous end joining (NHEJ) is a major repair pathway for DNA double-strand breaks (DSBs) generated by ionizing radiation (IR) and anti-cancer drugs. Therefore, inhibiting the activity of proteins involved in this pathway is a promising way of sensitizing cancer cells to both radiotherapy and chemotherapy. In this study, we developed an assay for evaluating NHEJ activity against DSBs in chromosomal DNA in human cells to identify the chromatin modification/remodeling proteins involved in NHEJ. We showed that ablating the activity of the homologous histone acetyltransferases, CBP and p300, using inhibitors or small interfering RNAs-suppressed NHEJ. Ablation of CBP or p300 impaired IR-induced DSB repair and sensitized lung cancer cells to IR and the anti-cancer drug, etoposide, which induces DSBs that are repaired by NHEJ. The CBP/p300 proteins were recruited to sites of DSBs and their ablation suppressed acetylation of lysine 18 within histone H3, and lysines 5, 8, 12, and 16 within histone H4, at the DSB sites. This then suppressed the recruitment of KU70 and KU80, both key proteins for NHEJ, to the DSB sites. Ablation of CBP/p300 also impaired the recruitment of BRM, a catalytic subunit of the SWI/SNF complex involved in chromatin remodeling at DSB sites. These results indicate that CBP and p300 function as histone H3 and H4 acetyltransferases at DSB sites in NHEJ and facilitate chromatin relaxation. Therefore, inhibition CBP and p300 activity may sensitize cancer cells to radiotherapy and chemotherapy.
Collapse
Affiliation(s)
- H Ogiwara
- Division of Genome Biology, National Cancer Center Research Institute, Chuo-ku, Tokyo, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
58
|
Li M, Luo RZ, Chen JW, Cao Y, Lu JB, He JH, Wu QL, Cai MY. High expression of transcriptional coactivator p300 correlates with aggressive features and poor prognosis of hepatocellular carcinoma. J Transl Med 2011; 9:5. [PMID: 21205329 PMCID: PMC3022728 DOI: 10.1186/1479-5876-9-5] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2010] [Accepted: 01/05/2011] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND It has been suggested that p300 participates in the regulation of a wide range of cell biological processes and mutation of p300 has been identified in certain types of human cancers. However, the expression dynamics of p300 in hepatocellular carcinoma (HCC) and its clinical/prognostic significance are unclear. METHODS In this study, the methods of reverse transcription-polymerase chain reaction (RT-PCR), Western blotting and immunohistochemistry (IHC) were utilized to investigate protein/mRNA expression of p300 in HCCs. Receiver operating characteristic (ROC) curve analysis, spearman's rank correlation, Kaplan-Meier plots and Cox proportional hazards regression model were used to analyze the data. RESULTS Up-regulated expression of p300 mRNA and protein was observed in the majority of HCCs by RT-PCR and Western blotting, when compared with their adjacent non-malignant liver tissues. According to the ROC curves, the cutoff score for p300 high expression was defined when more than 60% of the tumor cells were positively stained. High expression of p300 was examined in 60/123 (48.8%) of HCCs and in 8/123 (6.5%) of adjacent non-malignant liver tissues. High expression of p300 was correlated with higher AFP level, larger tumor size, multiplicity, poorer differentiation and later stage (P < 0.05). In univariate survival analysis, a significant association between overexpression of p300 and shortened patients' survival was found (P = 0.001). In different subsets of HCC patients, p300 expression was also a prognostic indicator in patients with stage II (P = 0.007) and stage III (P = 0.011). Importantly, p300 expression was evaluated as an independent prognostic factor in multivariate analysis (P = 0.021). Consequently, a new clinicopathologic prognostic model with three poor prognostic factors (p300 expression, AFP level and vascular invasion) was constructed. The model could significantly stratify risk (low, intermediate and high) for overall survival (P < 0.0001). CONCLUSIONS Our findings provide a basis for the concept that high expression of p300 in HCC may be important in the acquisition of an aggressive phenotype, suggesting that p300 overexpression, as examined by IHC, is an independent biomarker for poor prognosis of patients with HCC. The combined clinicopathologic prognostic model may become a useful tool for identifying HCC patients with different clinical outcomes.
Collapse
Affiliation(s)
- Mei Li
- State Key Laboratory of Oncology in South China, Sun Yat-Sen University Cancer Center, Guangzhou, PR China
| | | | | | | | | | | | | | | |
Collapse
|
59
|
Intracellular distribution of p300 and its differential recruitment to aggresomes in breast cancer. Exp Mol Pathol 2010; 88:256-64. [PMID: 20097195 DOI: 10.1016/j.yexmp.2010.01.007] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2009] [Revised: 01/18/2010] [Accepted: 01/19/2010] [Indexed: 11/21/2022]
Abstract
It has been recently suggested that p300 cytoplasmic redistribution and degradation are important for controlling the availability and activity of the protein as a transcriptional coactivator. As a step towards determining the functional relevance of p300 intracellular redistribution in mammary cancer, we aimed at studying p300 localization in two different animal models of mammary carcinoma as well as in human primary breast carcinoma samples. Analysis of p300 protein levels showed stronger expression in tumor epithelia than in normal mammary gland. Cytoplasmic localization of p300 was observed in malignant cells. Furthermore, cytoplasmic p300 was found in tumor epithelia whereas nuclear localization was observed in normal mammary glands in both animal models and in non-malignant adjacent areas of human breast cancer specimens. Interestingly, proteasomal inhibition induced p300 redistribution to perinuclear inclusion bodies in tumor but not in normal mammary gland-derived cells. These inclusions were confirmed to be aggresomes by doing immunofluorescence for ubiquitin, vimentin and 20S proteasomal subunit. Taken together, these findings show that both the localization of p300 and the recruitment to aggresomes differ between mammary tumors and normal mammary glands, and suggest that the formation of these inclusions could be a potential target for therapeutic intervention.
Collapse
|
60
|
Wang J, Tian T. Quantitative model for inferring dynamic regulation of the tumour suppressor gene p53. BMC Bioinformatics 2010; 11:36. [PMID: 20085646 PMCID: PMC2832896 DOI: 10.1186/1471-2105-11-36] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2009] [Accepted: 01/19/2010] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The availability of various "omics" datasets creates a prospect of performing the study of genome-wide genetic regulatory networks. However, one of the major challenges of using mathematical models to infer genetic regulation from microarray datasets is the lack of information for protein concentrations and activities. Most of the previous researches were based on an assumption that the mRNA levels of a gene are consistent with its protein activities, though it is not always the case. Therefore, a more sophisticated modelling framework together with the corresponding inference methods is needed to accurately estimate genetic regulation from "omics" datasets. RESULTS This work developed a novel approach, which is based on a nonlinear mathematical model, to infer genetic regulation from microarray gene expression data. By using the p53 network as a test system, we used the nonlinear model to estimate the activities of transcription factor (TF) p53 from the expression levels of its target genes, and to identify the activation/inhibition status of p53 to its target genes. The predicted top 317 putative p53 target genes were supported by DNA sequence analysis. A comparison between our prediction and the other published predictions of p53 targets suggests that most of putative p53 targets may share a common depleted or enriched sequence signal on their upstream non-coding region. CONCLUSIONS The proposed quantitative model can not only be used to infer the regulatory relationship between TF and its down-stream genes, but also be applied to estimate the protein activities of TF from the expression levels of its target genes.
Collapse
Affiliation(s)
- Junbai Wang
- Division of Pathology, The Norwegian Radium Hospital, Rikshospitalet University Hospital, Montebello 0310 Oslo, Norway
| | | |
Collapse
|
61
|
Wang L, Tang Y, Cole PA, Marmorstein R. Structure and chemistry of the p300/CBP and Rtt109 histone acetyltransferases: implications for histone acetyltransferase evolution and function. Curr Opin Struct Biol 2008; 18:741-7. [PMID: 18845255 DOI: 10.1016/j.sbi.2008.09.004] [Citation(s) in RCA: 135] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2008] [Revised: 09/08/2008] [Accepted: 09/14/2008] [Indexed: 01/03/2023]
Abstract
The recent structure and associated biochemical studies of the metazoan-specific p300/CBP and fungal-specific Rtt109 histone acetyltransferases (HATs) have provided new insights into the ancestral relationship between HATs and their functions. These studies point to a common HAT ancester that has evolved around a common structural framework to form HATs with divergent catalytic and substrate-binding properties. These studies also point to the importance of regulatory loops within HATs and autoacetylation in HAT function. Implications for future studies are discussed.
Collapse
Affiliation(s)
- Ling Wang
- Department of Pharmacology and Molecular Sciences, Johns Hopkins University, School of Medicine, 725 North Wolfe Street, Baltimore, MD 21205, USA
| | | | | | | |
Collapse
|
62
|
|