Apoptosis signal-regulating kinase 1/p38 signaling pathway negatively regulates physiological hypertrophy

Circulation
Masayuki TaniikeKinya Otsu

Abstract

Mechanical stress on the heart can lead to crucially different outcomes. Physiological stimuli such as exercise cause adaptive cardiac hypertrophy, characterized by a normal cardiac structure and normal or enhanced cardiac function. Pathological stimuli such as hypertension and aortic valvular stenosis cause maladaptive cardiac remodeling and ultimately heart failure. Apoptosis signal-regulating kinase 1 (ASK1) is known to be involved in pathological cardiac remodeling, but it has not been determined whether ASK1 pathways coordinate the signaling cascade leading to physiological type cardiac growth. To evaluate the role of ASK1 in the physiological form of cardiac growth, mice lacking ASK1 (ASK1-/-) were exercised by swimming for 4 weeks. ASK1-/- mice showed exaggerated growth of the heart accompanied by typical characteristics of physiological hypertrophy. Their swimming-induced activation of Akt, a key molecule in the signaling cascade of physiological hypertrophy, increased more than that seen in wild-type controls. The activation of p38, a downstream kinase of ASK1, was suppressed selectively in the swimming-exercised ASK1-/- mice. Furthermore, the inhibition of ASK1 or p38 activity enhanced insulin-like growth factor 1-ind...Continue Reading

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