Distinct roles for sarcolemmal and mitochondrial adenosine triphosphate-sensitive potassium channels in isoflurane-induced protection against oxidative stress.

Abstract:

BACKGROUND:Cardiac preconditioning, including that induced by halogenated anesthetics, is an innate protective mechanism against ischemia-reperfusion injury. The adenosine triphosphate-sensitive potassium (K(ATP)) channels are considered essential in preconditioning mechanism. However, it is unclear whether K(ATP) channels are triggers initiating the preconditioning signaling, and/or effectors responsible for the cardioprotective memory and activated during ischemia-reperfusion. METHODS:Adult rat cardiomyocytes were exposed to oxidative stress with 200 microM H(2)O(2) and 100 microM FeSO4. Myocyte survival was determined based on morphologic characteristics and trypan blue exclusion. To induce preconditioning, the myocytes were pretreated with isoflurane. The involvement of sarcolemmal and mitochondrial K(ATP) channels was investigated using specific inhibitors HMR-1098 and 5-hydroxydecanoic acid. Data are expressed as mean +/- SD. RESULTS:Oxidative stress induced cell death in 47 +/- 14% of myocytes. Pretreatment with isoflurane attenuated this effect to 26 +/- 8%. Blockade of the sarcolemmal K(ATP) channels abolished the protection by isoflurane pretreatment when HMR-1098 was applied throughout the experiment (50 +/- 21%) or only during oxidative stress (50 +/- 12%), but not when applied during isoflurane pretreatment (29 +/- 13%). Inhibition of the mitochondrial K(ATP) channels abolished cardioprotection irrespective of the timing of 5-hydroxydecanoic acid application. Cell death was 42 +/- 23, 45 +/- 23, and 46 +/- 22% when 5-hydroxydecanoic acid was applied throughout the experiment, only during isoflurane pretreatment, or only during oxidative stress, respectively. CONCLUSION:The authors conclude that both sarcolemmal and mitochondrial K(ATP) channels play essential and distinct roles in protection afforded by isoflurane. Sarcolemmal K(ATP) channel seems to act as an effector of preconditioning, whereas mitochondrial K(ATP) channel plays a dual role as a trigger and an effector.

journal_name

Anesthesiology

journal_title

Anesthesiology

authors

Marinovic J,Bosnjak ZJ,Stadnicka A

doi

10.1097/00000542-200607000-00018

subject

Has Abstract

pub_date

2006-07-01 00:00:00

pages

98-104

issue

1

eissn

0003-3022

issn

1528-1175

pii

00000542-200607000-00018

journal_volume

105

pub_type

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