© 1997 American Heart Association, Inc.
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Role of Angiotensin II in Activation of the JAK/STAT Pathway Induced by Acute Pressure Overload in the Rat Heart
From the Cardiopulmonary Division (J.P., K.F., H.K., S.M., T.T., M.S., S.O.), Department of Internal Medicine, and the Department of Emergency Medicine (S.H.), Keio University, Tokyo, Japan.
Correspondence to Keiichi Fukuda, Cardiopulmonary Division, Department of Internal Medicine, Keio University, 35 Shinanomachi, Shinjuku-ku, Tokyo 160, Japan. E-mail kfukuda{at}mc.med.keio.ac.jp
Abstract This study was designed to determine whether the JAK/STAT (indicating just another kinase/signal transducer and activator of transcription) pathway is activated in cardiac hypertrophy induced in vivo by pressure overload in rats and to demonstrate whether angiotensin II is involved in the activation of the JAK/STAT pathway. Acute pressure overload was produced by constricting the abdominal aorta of Wistar rats. Immunoprecipitation–Western blot analysis revealed that pressure overload activated JAK1, JAK2, and Tyk2 as early as 5 minutes and that STAT1, STAT2, and STAT3 were tyrosine-phosphorylated rapidly after exposure to the pressure overload. Phosphorylation of STAT1 and STAT2 peaked in the early stage at 5 to 15 minutes, whereas that of STAT3 peaked in the late stage at 60 minutes. Gel mobility shift of the interferon gamma activation site/interferon alpha–stimulating response element was observed immediately after the aortic banding, whereas the band of sis-inducing element was shifted in the late stage at 60 minutes. Both cilazapril (angiotensin II–converting enzyme inhibitor) and E4177 (angiotensin II type 1 [AT1] receptor antagonist) significantly suppressed the phosphorylation of Tyk2 and partially inhibited the phosphorylation of JAK2, but neither affected JAK1. Coimmunoprecipitation of the AT1 receptor with JAK2 or Tyk2 was clearly observed at 5 minutes and peaked at 15 minutes (20-fold the control value). These results indicate that the JAK/STAT pathway is activated by acute pressure overload in rats and that angiotensin II is involved in activating Tyk2, and partially activating JAK2, via the AT1 receptor. Both angiotensin II–dependent and –independent pathways take part in activating the JAK/STAT pathway in the pressure-overloaded rat heart.
Key Words: myocardial hypertrophy • pressure overload • signal transduction • JAK/STAT pathway • angiotensin II
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