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Interference with ERK(Thr188) phosphorylation impairs pathological but not physiological cardiac hypertrophy.

Abstract：

:Extracellular signal-regulated kinases 1 and 2 (ERK1/2) are central mediators of cardiac hypertrophy and are discussed as potential therapeutic targets. However, direct inhibition of ERK1/2 leads to exacerbated cardiomyocyte death and impaired heart function. We have previously identified ERK(Thr188) autophosphorylation as a regulatory phosphorylation of ERK1/2 that is a key factor in cardiac hypertrophy. Here, we investigated whether interference with ERK(Thr188) phosphorylation permits the impairment of ERK1/2-mediated cardiac hypertrophy without increasing cardiomyocyte death. The impact of ERK(Thr188) phosphorylation on cardiomyocyte hypertrophy and cell survival was analyzed in isolated cells and in mice using the mutant ERK2(T188A), which is dominant-negative for ERK(Thr188) signaling. ERK2(T188A) efficiently attenuated cardiomyocyte hypertrophic responses to phenylephrine and to chronic pressure overload, but it affected neither antiapoptotic ERK1/2 signaling nor overall physiological cardiac function. In contrast to its inhibition of pathological hypertrophy, ERK2(T188A) did not interfere with physiological cardiac growth occurring with age or upon voluntary exercise. A preferential role of ERK(Thr188) phosphorylation in pathological types of hypertrophy was also seen in patients with aortic valve stenosis: ERK(Thr188) phosphorylation was increased 8.5 ± 1.3-fold in high-gradient, rapidly progressing cases (≥40 mmHg gradient), whereas in low-gradient, slowly progressing cases, the increase was not significant. Because interference with ERK(Thr188) phosphorylation (i) inhibits pathological hypertrophy and (ii) does not impair antiapoptotic ERK1/2 signaling and because ERK(Thr188) phosphorylation shows strong prevalence for aortic stenosis patients with rapidly progressing course, we conclude that interference with ERK(Thr188) phosphorylation offers the possibility to selectively address pathological types of cardiac hypertrophy.

journal_name

Proc Natl Acad Sci U S A

journal_title

Proceedings of the National Academy of Sciences of the United States of America

authors

Ruppert C,Deiss K,Herrmann S,Vidal M,Oezkur M,Gorski A,Weidemann F,Lohse MJ,Lorenz K

doi

10.1073/pnas.1221999110

subject

Has Abstract

pub_date

2013-04-30 00:00:00

pages

7440-5

issue

eissn

0027-8424

issn

1091-6490

pii

1221999110

journal_volume

110

pub_type

杂志文章

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Interference with ERK(Thr188) phosphorylation impairs pathological but not physiological cardiac hypertrophy.