Resveratrol enhances p53 acetylation and apoptosis in prostate cancer by inhibiting MTA1/NuRD complex.

Abstract

Dietary compounds and epigenetic influences are well recognized factors in cancer progression. Resveratrol (Res), a dietary compound from grapes, has anticancer properties; however, its epigenetic effects are understudied. Metastasis-associated protein 1 (MTA1) is a part of the nucleosome remodeling deacetylation (NuRD) corepressor complex that mediates posttranslational modifications of histones and nonhistone proteins resulting in transcriptional repression. MTA1 overexpression in prostate cancer (PCa) correlates with tumor aggressiveness and metastasis. In this study, we have identified a novel MTA1-mediated mechanism, by which Res restores p53-signaling pathways in PCa cells. We show, for the first time, that Res causes down-regulation of MTA1 protein, leading to destabilization of MTA1/NuRD thus allowing acetylation/activation of p53. We demonstrated that MTA1 decrease by Res was concomitant with accumulation of Ac-p53. MTA1 knockdown further sensitized PCa cells to Res-dependent p53 acetylation and recruitment to the p21 and Bax promoters. Furthermore, MTA1 silencing maximized the levels of Res-induced apoptosis and pro-apoptotic Bax accumulation. HDAC inhibitor SAHA, like MTA1 silencing, increased Res-dependent p53 acetylation and showed cooperative effect on apoptosis. Our results indicate a novel epigenetic mechanism that contributes to Res anticancer activities: the inhibition of MTA1/NuRD complexes due to MTA1 decrease, which suppresses its deacetylation function and allows p53 acetylation and subsequent activation of pro-apoptotic genes. Our study identifies MTA1 as a new molecular target of Res that may have important clinical applications for PCa chemoprevention and therapy, and points to the combination of Res with HDAC inhibitors as an innovative therapeutic strategy for the treatment of PCa.

• Authors: Li Kai, Shirley K Samuel, Anait S Levenson
• Journal: International journal of cancer (Int J Cancer) Vol. 126 Issue 7 Pg. 1538-48 (Apr 01 2010) ISSN: 1097-0215 [Electronic] United States
• PMID: 19810103 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Anticarcinogenic Agents
• BAX protein, human
• Cyclin-Dependent Kinase Inhibitor p21
• Histone Deacetylase Inhibitors
• Mta1 protein, human
• Nucleosomes
• RNA, Messenger
• RNA, Small Interfering
• Repressor Proteins
• Stilbenes
• TP53 protein, human
• Trans-Activators
• Tumor Suppressor Protein p53
• bcl-2-Associated X Protein
• HDAC1 protein, human
• Histone Deacetylase 1
• Histone Deacetylases
• Mi-2 Nucleosome Remodeling and Deacetylase Complex
• Resveratrol

Topics

• Acetylation (drug effects)
• Anticarcinogenic Agents (pharmacology)
• Apoptosis (drug effects)
• Blotting, Western
• Chromatin Immunoprecipitation
• Cyclin-Dependent Kinase Inhibitor p21 (metabolism)
• Histone Deacetylase 1 (antagonists & inhibitors, metabolism)
• Histone Deacetylase Inhibitors (pharmacology)
• Histone Deacetylases
• Humans
• Immunoprecipitation
• Male
• Mi-2 Nucleosome Remodeling and Deacetylase Complex (antagonists & inhibitors)
• Nucleosomes
• Promoter Regions, Genetic
• Prostatic Neoplasms (metabolism, pathology)
• RNA, Messenger (genetics, metabolism)
• RNA, Small Interfering (pharmacology)
• Repressor Proteins (antagonists & inhibitors)
• Resveratrol
• Reverse Transcriptase Polymerase Chain Reaction
• Stilbenes (pharmacology)
• Trans-Activators
• Transcription, Genetic (drug effects)
• Tumor Cells, Cultured
• Tumor Suppressor Protein p53 (genetics, metabolism)
• bcl-2-Associated X Protein (metabolism)