Phosphorylation of Glycogen Synthase Kinase-3&bgr; During Preconditioning Through a Phosphatidylinositol-3-Kinase–Dependent Pathway Is Cardioprotective
作者:
Haiyan Tong,
Kenichi Imahashi,
Charles Steenbergen,
Elizabeth Murphy,
期刊:
Circulation Research: Journal of the American Heart Association
(OVID Available online 2002)
卷期:
Volume 90,
issue 4
页码: 377-379
ISSN:0009-7330
年代: 2002
出版商: OVID
关键词: ischemic preconditioning;phosphatidylinositol-3-kinase;glycogen synthase kinase-3&bgr;
数据来源: OVID
摘要:
We previously reported that activation of phosphatidylinositol-3-kinase (PI3-kinase) is involved in ischemic preconditioning (PC). Our goal was to determine downstream targets of PI3-kinase. In perfused rat hearts, PC (4 cycles of 5 minutes of ischemia and 5 minutes of reflow) increased phosphorylation of glycogen synthase kinase-3&bgr; (GSK-3&bgr;), a downstream target of PI3-kinase and protein kinase B (PKB), an effect that was blocked by wortmannin. Because phosphorylation inactivates GSK-3&bgr;, we examined whether PC-induced phosphorylation and inhibition of GSK-3&bgr; is important in PC by using two inhibitors of GSK-3&bgr;, lithium and SB 216763. Pretreatment of perfused rat hearts with lithium or SB 216763, before ischemia, mimicked the protective effects of PC; hearts treated with either lithium or SB 216763 had improved postischemic function and reduced infarct size. These findings indicate that inhibition of GSK-3&bgr; is protective and that this PI3-kinase–dependent signaling pathway may play an important role in ischemic preconditioning.
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