Cardiac-specific LIM protein FHL2 modifies the hypertrophic response to β-adrenergic stimulation

Yanfeng Kong, John M. Shelton, Beverly Rothermel, Xiangqing Li, James A. Richardson, Rhonda Bassel-Duby, R. Sanders Williams

Research output: Contribution to journalArticle

114 Scopus citations

Abstract

Background - A deficiency of muscle LIM protein results in dilated cardiomyopathy, but the function of other LIM proteins in the heart has not been assessed previously. We have characterized the expression and function of FHL2, a heart-specific member of the LIM domain gene family. Methods and Results - Expression of FHL2 mRNA and protein was examined by Northern blot, in situ hybridization, and Western blot analyses of fetal and adult mice. FHL2 transcripts are present at embryonic day (E) 7.5 within the cardiac crescent in a pattern that resembles that of Nkx2.5 mRNA. During later stages of cardiac development and in adult animals, FHL2 expression is localized to the myocardium and absent from endocardium, cardiac cushion, outflow tract, or coronary vasculature. The gene encoding FHL2 was disrupted by homologous recombination, and knockout mice devoid of FHL2 were found to undergo normal cardiovascular development. In the absence of FHL2, however, cardiac hypertrophy resulting from chronic infusion of isoproterenol is exaggerated (59% versus 20% increase in heart weight/body weight in FHL null versus wild-type mice; P<0.01). Conclusions - FHL2 is an early marker of cardiogenic cells and a cardiac-specific LIM protein in the adult. FHL2 is not required for normal cardiac development but modifies the hypertrophic response to β-adrenergic stimulation.

Original languageEnglish (US)
Pages (from-to)2731-2738
Number of pages8
JournalCirculation
Volume103
Issue number22
DOIs
StatePublished - Jun 5 2001

Keywords

  • Genetics
  • Hypertrophy
  • Molecular biology
  • Myocardium

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

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