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Circulation Research. 2002;90:377-379
Published online before print February 7, 2002, doi: 10.1161/01.RES.0000012567.95445.55
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(Circulation Research. 2002;90:377.)
© 2002 American Heart Association, Inc.


Reports

Phosphorylation of Glycogen Synthase Kinase-3ß During Preconditioning Through a Phosphatidylinositol-3-Kinase–Dependent Pathway Is Cardioprotective

Haiyan Tong, Kenichi Imahashi, Charles Steenbergen, Elizabeth Murphy

From the Laboratory of Signal Transduction (H.T, K.I. E.M.), National Institute of Environmental Health Sciences, Research Triangle Park, NC; and Department of Pathology (C.S.), Duke University Medical Center, Durham, NC.

Correspondence to Elizabeth Murphy, NIEHS, Research Triangle Park, NC 27709. E-mail murphy1{at}niehs.nih.gov

Abstract

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-3ß (GSK-3ß), a downstream target of PI3-kinase and protein kinase B (PKB), an effect that was blocked by wortmannin. Because phosphorylation inactivates GSK-3ß, we examined whether PC-induced phosphorylation and inhibition of GSK-3ß is important in PC by using two inhibitors of GSK-3ß, 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-3ß is protective and that this PI3-kinase–dependent signaling pathway may play an important role in ischemic preconditioning.


Key Words: ischemic preconditioning • phosphatidylinositol-3-kinase • glycogen synthase kinase-3ß




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