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The transcriptional repressor Nab1 is a specific regulator of pathological cardiac hypertrophy

The transcriptional repressor Nab1 is a specific regulator of pathological cardiac hypertrophy Hypertrophy represents the major physiological response of the heart to adapt to chronically enhanced workload, but is also crucial in the development of heart failure. Although we know of numerous inducers of cardiac hypertrophy, little is known about mechanisms that limit cardiac hypertrophy. Here, we describe the transcriptional repressor NAB1 as an endogenous regulator of cardiac growth. We identified NAB1 as being upregulated in both mouse and human heart failure. Nab1 is highly expressed in mammalian cardiac myocytes and it inhibited cardiomyocyte hypertrophy through repression of its targets, transcription factor Egr. Transgenic mice with cardiac-specific overexpression of Nab1 showed that Nab1 is a potent inhibitor of cardiac growth in response to pathological stimuli in vivo. Nab1 overexpression suppressed adrenergically induced and pressure overload–induced hypertrophy, whereas physiological growth during development and in response to exercise was not affected. These findings implicate the Nab1-Egr1 axis as a crucial regulator of pathological cardiac growth. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nature Medicine Springer Journals

The transcriptional repressor Nab1 is a specific regulator of pathological cardiac hypertrophy

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References (37)

Publisher
Springer Journals
Copyright
Copyright © 2005 by Nature Publishing Group
Subject
Biomedicine; Biomedicine, general; Cancer Research; Metabolic Diseases; Infectious Diseases; Molecular Medicine; Neurosciences
ISSN
1078-8956
eISSN
1546-170X
DOI
10.1038/nm1272
Publisher site
See Article on Publisher Site

Abstract

Hypertrophy represents the major physiological response of the heart to adapt to chronically enhanced workload, but is also crucial in the development of heart failure. Although we know of numerous inducers of cardiac hypertrophy, little is known about mechanisms that limit cardiac hypertrophy. Here, we describe the transcriptional repressor NAB1 as an endogenous regulator of cardiac growth. We identified NAB1 as being upregulated in both mouse and human heart failure. Nab1 is highly expressed in mammalian cardiac myocytes and it inhibited cardiomyocyte hypertrophy through repression of its targets, transcription factor Egr. Transgenic mice with cardiac-specific overexpression of Nab1 showed that Nab1 is a potent inhibitor of cardiac growth in response to pathological stimuli in vivo. Nab1 overexpression suppressed adrenergically induced and pressure overload–induced hypertrophy, whereas physiological growth during development and in response to exercise was not affected. These findings implicate the Nab1-Egr1 axis as a crucial regulator of pathological cardiac growth.

Journal

Nature Medicine – Springer Journals

Published: Jul 17, 2005

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