Morphine Mimics Preconditioning via Free Radical Signals and Mitochondrial KATP Channels in Myocytes
Morphine Mimics Preconditioning via Free Radical Signals and Mitochondrial KATP Channels in Myocytes
复制标题
吗啡通过肌细胞中的自由基信号和线粒体 KATP 通道模拟预处理
作者:
B. C. McPherson;Z. Yao
BackgroundWe tried to determine whether morphine mimics preconditioning (PC) to reduce cell death in cultured cardiomyocytes and whether opioid &dgr;1 receptors, free radicals, and KATP channels mediate this effect. Methods and ResultsChick embryonic ventricular myocytes were studied in a flow-through chamber while flow rate, pH, and O2 and CO2 tension were controlled. Cardiomyocyte viability was quantified with propidium iodide (5 &mgr;mol/L), and production of free radicals was measured with 2′,7′-dichlorofluorescin diacetate. PC with 10 minutes of simulated ischemia before 10 minutes of reoxygenation or morphine (1 &mgr;mol/L) or BW373U86 (10 pmol/L) infusion for 10 minutes followed by a 10-minute drug-free period before 1 hour of ischemia and 3 hours of reoxygenation reduced cell death to the same extent (*P <0.05) (PC, 20±1%, n=7*; morphine, 32±4%, n=8*; BW373U86, 21±6%; controls, 52±5%, n=8). Like PC, morphine and BW373U86 increased free radical production 2-fold before ischemia (0.35±0.10, n=6*; 0.41±0.08, n=4* versus controls, 0.15±0.05, n=8, arbitrary units). Protection and increased free radical signals during morphine infusion were abolished with either the thiol reductant 2-mercaptopropionyl glycine (400 &mgr;mol/L), an antioxidant; naloxone (10 &mgr;mol/L), a nonselective morphine receptor antagonist; BNTX (0.1 &mgr;mol/L), a selective opioid &dgr;1 receptor antagonist; or 5-hydroxydecanoate (100 &mgr;mol/L), a selective mitochondrial KATP channel antagonist. ConclusionsThese results suggest that direct stimulation of cardiocyte opioid &dgr;1 receptors leads to activation of mitochondrial KATP channels. The resultant increase of intracellular free radical signals may be an important component of the signaling pathways by which morphine mimics preconditioning in cardiomyocytes.
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DOI:
10.1073/pnas.86.17.6758
发表时间:
1989-09-01
影响因子:
11.1
作者:
GOPALAKRISHNA, R;ANDERSON, WB
通讯作者:
ANDERSON, WB
DOI:
--
发表时间:
1991
期刊:
Research communications in chemical pathology and pharmacology
影响因子:
--
作者:
Bond,JM;Herman,B;Lemasters,JJ
通讯作者:
Lemasters,JJ
DOI:
--
发表时间:
1988
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Wilson,DF;Rumsey,WL;Green,TJ;Vanderkooi,JM
通讯作者:
Vanderkooi,JM
影响因子:
20.1
作者:
Liu, YG;Gao, WD;Marban, E
通讯作者:
Marban, E
DOI:
10.1152/ajpheart.1999.277.6.h2504
发表时间:
1999
期刊:
The American journal of physiology
影响因子:
--
作者:
Yao,Z;Tong,J;Tan,X;Li,C;Shao,Z;Kim,WC;vandenHoek,TL;Becker,LB;Head,CA;Schumacker,PT
通讯作者:
Schumacker,PT