Effects of N-n-butyl haloperidol iodide on the rat myocardial sarcoplasmic reticulum Ca(2+)-ATPase during ischemia/reperfusion |
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Authors: | Yan-Mei Zhang Chun-Yan Wang Fu-Chun Zheng Fen-Fei Gao Yi-Cun Chen Zhan-Qin Huang Zheng-Yuan Xia Michael G Irwin Wei-Qiu Li Xing-Ping Liu Yan-Shan Zheng Han Xu Gang-Gang Shi |
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Institution: | Department of Pharmacology, Shantou University Medical College, Shantou 515041, Guangdong, China. |
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Abstract: | We have previously shown that N-n-butyl haloperidol iodide (F(2)), a newly synthesized compound, reduces ischemia/reperfusion (I/R) injury by preventing intracellular Ca(2+) overload through inhibiting L-type calcium channels and outward current of Na(+)/Ca(2+) exchanger. This study was to investigate the effects of F(2) on activity and protein expression of the rat myocardial sarcoplasmic reticulum Ca(2+)-ATPase (SERCA) during I/R to discover other molecular mechanisms by which F(2) maintains intracellular Ca(2+) homeostasis. In an in vivo rat model of myocardial I/R achieved by occluding coronary artery for 30-60min followed by 0-120min reperfusion, treatment with F(2) (0.25, 0.5, 1, 2 and 4mg/kg, respectively) dose-dependently inhibited the I/R-induced decrease in SERCA activity. However, neither different durations of I/R nor different doses of F(2) altered the expression levels of myocardial SERCA2a protein. These results indicate that F(2) exerts cardioprotective effects against I/R injury by inhibiting I/R-mediated decrease in SERCA activity by a mechanism independent of SERCA2a protein levels modulation. |
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