Study on the effect of doxorubicin on expressions of genes encoding myocardial sarcoplasmic reticulum Ca^2＋ transport proteins and the effect of taurine on myocardial protection in rabbits
Study on the effect of doxorubicin on expressions of genes encoding myocardial sarcoplasmic reticulum Ca^( 2+) transport proteins and the effect of taurine on myocardial protection in rabbits作者机构：Children＇sHospitalCollegeofMedicineZhefiangUniversityHangzhou310003China
出 版 物：《Journal of Zhejiang University Science》 (浙江大学学报（自然科学英文版）)
年 卷 期：2003年第4卷第1期
页 面：114-120页
核心收录：
学科分类：1007[医学-药学(可授医学、理学学位)] 1002[医学-临床医学] 100202[医学-儿科学] 10[医学]
主 题：Doxorubicin Ca 2+ ATPase Ryanodine receptor Taurine Gene expression
摘 要：To investigate the effect of doxorubicin(DOX) on gene expression of the myocardial sarcoplasmic reticulum (SR)Ca 2+ transport proteins and the mechanism of taurine(Tau) protecting cardiac muscle cells, 9 rabbits were injected with DOX , 8 rabbits with DOX and Tau, and 9 rabbits with normal saline. Cardiac function , concentration of calcium in cardiomyocytes (Myo[Ca 2+ ] \%i\%), activity of SR Ca 2+ ATPase(SERCA2a), level of SERCA2a mRNA and Ca 2+ released channels(RYR2)mRNA were detected. The left ventricle tissues were observed by electron microscopy. The results showed that cardiac index, left ventricular systolic pressure, activity of SR Ca 2+ ATPase and level of SERCA2a mRNA decreased , while Myo[Ca 2+ ] \%i\% increased in DOX treated rabbits. DOX could not affect the level of RYR2 mRNA. Tau intervention could alleviate the increase of left ventricular diastolic pressure, Myo[Ca 2+ ] \%i\% and the decrease of SERCA2a mRNA induced by doxorubicin. The results suggested that downregulation of SERCA2a gene expression was an important mechanism of DOX induced cardiomyopathy and that Tau could partially improve the heart function by reducing calcium overload and alleviating downregulation of SERCA2a mRNA.
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