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Protection of ischemic preconditioning is dependent upon a critical timing sequence of protein kinase C activation.

Abstract：

:The protection of ischemic preconditioning (PC) appears to be triggered by activation of receptors which couple to protein kinase C (PKC) during the brief ischemia. Previous experiments, however, suggest that phosphorylation of PKC's substrates is not required for the myocytes to enter the preconditioned state. Because of the fundamental importance of this observation, the present study was designed to stringently test when phosphorylation must occur during a PC protocol. We used an in vitro rabbit heart which permitted precise control of the timing of exposure to staurosporine (STA), a reversible blocker of PKC's kinase activity. In control hearts a 30-min regional coronary occlusion followed by 2 h of reperfusion resulted in 31.4 +/- 1.5% infarction of the region at risk, and STA (100 nM) had little effect. PC with 5 min of global ischemia and 10 min of reperfusion reduced infarction to 11.4% (P < 0.01 v control). STA starting 5 min before and ending 5 min after the 5-min PC ischemia did not block protection (14.1 +/- 1.7% infarction, P < 0.01 v control). When the PC protocol was changed to 5 min ischemia/20 min reperfusion, STA still could not block protection even though the infusion continued for 15 min after the PC ischemia. However, when a 15-min STA infusion was initiated 5 min before the 30-min ischemic period. PC's protection was totally blocked. Moreover this late infusion of STA continued to block protection even when the PC stimulus was amplified by three cycles of 5-min ischemia/10-min reperfusion. These observations indicate that kinase activity is not required to put the rabbit heart into a preconditioned state suggesting that some process upstream of PKC's kinase is responsible for the triggering and memory of PC.

journal_name

J Mol Cell Cardiol

journal_title

Journal of molecular and cellular cardiology

authors

Yang XM,Sato H,Downey JM,Cohen MV

doi

10.1006/jmcc.1996.0344

subject

Has Abstract

pub_date

1997-03-01 00:00:00

pages

991-9

issue

3

eissn

0022-2828

issn

1095-8584

pii

S0022-2828(96)90344-2

journal_volume

29

pub_type

杂志文章

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