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SRC-2 coactivator deficiency decreases functional reserve in response to pressure overload of mouse heart.

Publication ,  Journal Article
Reineke, EL; York, B; Stashi, E; Chen, X; Tsimelzon, A; Xu, J; Newgard, CB; Taffet, GE; Taegtmeyer, H; Entman, ML; O'Malley, BW
Published in: PLoS One
2012

A major component of the cardiac stress response is the simultaneous activation of several gene regulatory networks. Interestingly, the transcriptional regulator steroid receptor coactivator-2, SRC-2 is often decreased during cardiac failure in humans. We postulated that SRC-2 suppression plays a mechanistic role in the stress response and that SRC-2 activity is an important regulator of the adult heart gene expression profile. Genome-wide microarray analysis, confirmed with targeted gene expression analyses revealed that genetic ablation of SRC-2 activates the "fetal gene program" in adult mice as manifested by shifts in expression of a) metabolic and b) sarcomeric genes, as well as associated modulating transcription factors. While these gene expression changes were not accompanied by changes in left ventricular weight or cardiac function, imposition of transverse aortic constriction (TAC) predisposed SRC-2 knockout (KO) mice to stress-induced cardiac dysfunction. In addition, SRC-2 KO mice lacked the normal ventricular hypertrophic response as indicated through heart weight, left ventricular wall thickness, and blunted molecular signaling known to activate hypertrophy. Our results indicate that SRC-2 is involved in maintenance of the steady-state adult heart transcriptional profile, with its ablation inducing transcriptional changes that mimic a stressed heart. These results further suggest that SRC-2 deletion interferes with the timing and integration needed to respond efficiently to stress through disruption of metabolic and sarcomeric gene expression and hypertrophic signaling, the three key stress responsive pathways.

Duke Scholars

Published In

PLoS One

DOI

EISSN

1932-6203

Publication Date

2012

Volume

7

Issue

12

Start / End Page

e53395

Location

United States

Related Subject Headings

  • Ventricular Remodeling
  • Ventricular Dysfunction, Left
  • Nuclear Receptor Coactivator 2
  • Myocytes, Cardiac
  • Myocardium
  • Mice, Knockout
  • Mice
  • Hypertrophy, Left Ventricular
  • Heart Ventricles
  • General Science & Technology
 

Citation

APA
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Reineke, E. L., York, B., Stashi, E., Chen, X., Tsimelzon, A., Xu, J., … O’Malley, B. W. (2012). SRC-2 coactivator deficiency decreases functional reserve in response to pressure overload of mouse heart. PLoS One, 7(12), e53395. https://doi.org/10.1371/journal.pone.0053395
Reineke, Erin L., Brian York, Erin Stashi, Xian Chen, Anna Tsimelzon, Jianming Xu, Christopher B. Newgard, et al. “SRC-2 coactivator deficiency decreases functional reserve in response to pressure overload of mouse heart.PLoS One 7, no. 12 (2012): e53395. https://doi.org/10.1371/journal.pone.0053395.
Reineke EL, York B, Stashi E, Chen X, Tsimelzon A, Xu J, et al. SRC-2 coactivator deficiency decreases functional reserve in response to pressure overload of mouse heart. PLoS One. 2012;7(12):e53395.
Reineke, Erin L., et al. “SRC-2 coactivator deficiency decreases functional reserve in response to pressure overload of mouse heart.PLoS One, vol. 7, no. 12, 2012, p. e53395. Pubmed, doi:10.1371/journal.pone.0053395.
Reineke EL, York B, Stashi E, Chen X, Tsimelzon A, Xu J, Newgard CB, Taffet GE, Taegtmeyer H, Entman ML, O’Malley BW. SRC-2 coactivator deficiency decreases functional reserve in response to pressure overload of mouse heart. PLoS One. 2012;7(12):e53395.

Published In

PLoS One

DOI

EISSN

1932-6203

Publication Date

2012

Volume

7

Issue

12

Start / End Page

e53395

Location

United States

Related Subject Headings

  • Ventricular Remodeling
  • Ventricular Dysfunction, Left
  • Nuclear Receptor Coactivator 2
  • Myocytes, Cardiac
  • Myocardium
  • Mice, Knockout
  • Mice
  • Hypertrophy, Left Ventricular
  • Heart Ventricles
  • General Science & Technology