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SB 203580, an Inhibitor of p38 MAPK, Abolishes Infarct-Limiting Effect of Ischemic Preconditioning in Isolated Rabbit Hearts

SB 203580, an Inhibitor of p38 MAPK, Abolishes Infarct-Limiting Effect of Ischemic Preconditioning in Isolated Rabbit Hearts

A Nakano, M V Cohen, S Critz, J M Downey

Basic Res Cardiol. 2000 Dec;95(6):466-71.

PMID: 11192367

Abstract:

There is debate concerning the involvement of p38 mitogen-activated protein kinase (MAPK) in ischemic preconditioning (PC). At the center of the controversy are data obtained after administration of SB 203580, a specific inhibitor of p38 MAPK. Whereas several studies have reported that SB 203580 abolishes the cardioprotective effect of PC, others claim that this compound is actually cardioprotective against ischemia. Many of these latter observations have been made in isolated myocardial cells. Accordingly the present study was designed to test the effect of SB 203580 in a model of preconditioning in intact rabbit hearts in which infarct size was the end-point. Isolated hearts experienced 30 min of regional ischemia followed by 120 min of reperfusion. Infarct size was measured with triphenyltetrazolium chloride. In control hearts infarction was 30.2 +/- 3.3% of the risk zone. PC with 5 min of global ischemia and 10 min of reperfusion before the 30-min period of ischemia significantly reduced infarct size to 10.2 +/- 2.4% (P < 0.05 vs. control). SB 203580 (2 microM) added to the perfusate for 20 min starting 5 min before the index ischemia totally blocked the protection from PC (27.4 +/- 3.3% infarction). SB 203580 alone had no effect on infarct size (28.6 +/- 4.6% infarction). These results reveal that SB 203580 does not affect infarct size on its own, but selectively blocks preconditioning's anti-infarct effect in the intact rabbit heart.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP152121476-A	SB 203580		152121-47-6	Price

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