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Integrative Physiology |
From the Department of Pharmacology (Y.I., S.K., Y.I., K.Y., H. Iwao), Osaka City University Graduate School of Medical Science, Osaka, Japan; Department of Internal Medicine and Cardiology (M.Y.), Osaka City University Graduate School of Medical Science, Osaka, Japan; Laboratory of Cell Signaling (A.M., H. Ichijo), Graduate School of Pharmaceutical Sciences, University of Tokyo, Tokyo, Japan.
Correspondence to Shokei Kim, Department of Pharmacology, Osaka City University Graduate School of Medical Science, 1-4-3 Asahimachi, Abeno, Osaka 545-8585, Japan. E-mail kims{at}med.osaka-cu.ac.jp
Multiple lines of evidence establish that angiotensin II (Ang II) induces not only hypertension but also directly contributes to cardiac diseases. Apoptosis signal-regulating kinase 1 (ASK1), one of mitogen-activated protein kinase kinase kinases, plays a key role in stress-induced cellular responses. However, nothing is known about the role of ASK1 in cardiac hypertrophy and remodeling in vivo. In this study, by using mice deficient in ASK1 (ASK1-/- mice), we investigated the role of ASK1 in cardiac hypertrophy and remodeling induced by Ang II. Left ventricular (LV) ASK1 was activated by Ang II infusion in wild-type mice, which was mediated by angiotensin II type 1 receptor and superoxide. Although Ang II-induced hypertensive effect was comparable to wild-type and ASK1-/- mice, LV ASK1 activation by Ang II was not detectable in ASK1-/- mice, and p38 and c-Jun N-terminal kinase (JNK) activation was lesser in ASK-/- mice than in wild-type mice. Elevation of blood pressure by continuous Ang II infusion was comparable between ASK1-/- and wild-type mice. However, Ang IIinduced cardiac hypertrophy and remodeling, including cardiomyocyte hypertrophy, cardiac hypertrophyrelated mRNA upregulation, cardiomyocyte apoptosis, interstitial fibrosis, coronary arterial remodeling, and collagen gene upregulation, was significantly attenuated in ASK1-/- mice compared with wild-type mice. These results provided the first in vivo evidence that ASK1 is the critical signaling molecule for Ang IIinduced cardiac hypertrophy and remodeling. Thus, ASK1 is proposed to be a potential therapeutic target for cardiac diseases.
Key Words: mitogen-activated protein kinase mice reactive oxygen species signal transduction gene expression
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