ROS-mediated ERK activation in delayed protection from anoxic preconditioning in neonatal rat cardiomyocytes.

Abstract:

BACKGROUND:The activation of extracellular signal-regulated kinase1/2 (ERK1/2) has been shown to be important signaling pathway in the ischemic preconditioning (IPC) response. Recently, some studies suggest a key role for the mitochondrial ATP-sensitive potassium channel (mKATP) as both a trigger and an end effector of acute and delayed protection of IPC. Hence, this study was undertaken to elucidate the relationship between mKATP and ERK1/2 in the delayed protection mechanism of anoxic preconditioning (APC). METHODS:An APC model was established using cultured neonatal rat cardiomyocytes. Pharmacological agents [diazoxide, 5-hydroxydecanoate (5-HD), 2-mercaptopropionylglycine (MPG), and PD98059] were used to modulate mKATP and ERK1/2 activation. Cellular injury was evaluated by measuring cellular superoxide dismutase (SOD) activity, cell viability, and lactate dehydrogenase (LDH) release. The generation of cellular reactive oxygen species (ROS) and the activation of ERK1/2 were determined at different time points starting from the beginning of preconditioning with anoxia or diazoxide (an mKATP opener). RESULTS:Cell viability and SOD activity in the APC [(81.9 +/- 11.4)%, (13.6 +/- 3.7) U/L] and diazoxide [(79.2 +/- 12.4)%, (16.5 +/- 4.6) U/L] groups were significantly higher than in the anoxia/reoxygenation (A/R) [(42.2 +/- 7.3)%, (8.8 +/- 2.8) U/L] group (all P < 0.01). LDH activity in the APC group [(101.9 +/- 18.9) U/L] and diazoxide group [(97.5 +/- 17.7) U/L] was significantly lower than in the A/R group [(250.5 +/- 43.6) U/L] (all P < 0.01). Both APC and diazoxide simultaneously facilitated intracellular ROS generation and rapid ERK1/2 activation. But the effects of APC and diazoxide were remarkedly attenuated by 5-HP (an mKATP blocker) and by MPG (a free radical scavenger). In addition, the ERK1/2 inhibitor PD98059 also abolished the cellular protective effects induced by diazoxide. CONCLUSION:mKATP may mediate ERK1/2 activation during anoxia preconditioning by generating ROS, which then triggers the delayed protection of APC in rat cardiomyocytes.

journal_name

Chin Med J (Engl)

journal_title

Chinese medical journal

authors

Gong KZ,Zhang ZG,Li AH,Huang YF,Bu P,Dong F,Liu J

keywords:

subject

Has Abstract

pub_date

2004-03-01 00:00:00

pages

395-400

issue

3

eissn

0366-6999

issn

2542-5641

journal_volume

117

pub_type

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