NDLI: Repression of Smad transcriptional activity by PIASy, an inhibitor of activated STAT.

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Repression of Smad transcriptional activity by PIASy, an inhibitor of activated STAT.

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Repression of Smad transcriptional activity by PIASy, an inhibitor of activated STAT.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Long, Jianyin Shuai, Ke Matsuura, Isao Wang, Guannan Liu, Fang He, Dongming
Description	Author Affiliation: Long J ( Center for Advanced Biotechnology and Medicine, Susan Lehman Cullman Laboratory for Cancer Research, Department of Chemical Biology, Ernest Mario School of Pharmacy, Rutgers, State University of New Jersey, 679 Hoes Lane, Piscataway, NJ 08854, USA.);
Abstract	Smad proteins mediate transforming growth factor beta (TGF-beta)-inducible transcriptional responses. Protein inhibitor of activated signal transducer and activator of transcription (PIAS) represents a family of proteins that inhibits signal transducer and activator of transcription and also regulates other transcriptional responses. In an effort to identify Smad-interacting proteins by a yeast three-hybrid screen with Smad3 and Smad4 as baits, we identified PIASy, a member of the PIAS family. In yeast, PIASy interacts strongly with Smad4 and also with receptor-regulated Smads. In mammalian cells, PIASy binds most strongly with Smad3 and also associates with other receptor-regulated Smads and Smad4. The interaction between Smad3 and PIASy is increased in the presence of TGF-beta and occurs through the C-terminal domain of Smad3. Moreover, Smad3, Smad4, and PIASy can form a ternary complex. PIASy does not inhibit Smad complex binding to DNA, but it represses Smad transcriptional activity. Interestingly, conditional overexpression of PIASy selectively inhibits a subset of endogenous TGF-beta-responsive genes, which includes the cyclin-dependent kinase inhibitor p15, and the plasminogen activator inhibitor 1. We further show that PIASy can interact constitutively with histone deacetylase 1 (HDAC1) and that addition of HDAC inhibitor trichostatin A (TSA) can prevent the inhibitory function of PIASy. Taken together, our studies indicate that PIASy can inhibit TGF-beta/Smad transcriptional responses through interactions with Smad proteins and HDAC.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	17
Volume Number	100
Language	English
Publisher	National Academy of Sciences
Publisher Date	2003-08-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Carrier Proteins Metabolism DNA-Binding Proteins Intracellular Signaling Peptides And Proteins Trans-Activators Animals COS Cells Chemistry Genetics Cell Line DNA Macromolecular Substances Mice Protein Inhibitors Of Activated STAT Recombinant Fusion Proteins Smad Proteins Smad3 Protein Smad4 Protein Transcription, Genetic Transfection Two-Hybrid System Techniques Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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