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1 《中国药理学与毒理学杂志》为军事医学科学院毒物药物研究所、中国药 理学会和中国毒理学会共同主办的学术性刊物,双月刊,国内外公开发行。编辑部设在军事医学科学院毒物药物研究所。本刊是中国中文核心期刊
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Effect of urantide on myocardial apoptosis in rats induced by ischemia/reperfusion injury
关键词: urantide myocardial reperfusion injury apoptosis
摘要:OBJECTIVE To investigate the protective effect of urantide on myocardial apoptosis in rats induced by ischemia/reperfusion(I/R) or hypoxia/reoxygenation(H/R) injury and explore the underlying mechanism.METHODS ① In vivo test A rat myocardial I/R injury model was induced by ligating and untying the left anterior descending coronary artery with occlusion 30 min/reperfusion 60 min.Urantide 3,10 and 30 μg·kg^-1 was iv given 10 min before ischemia.TUNEL labeling was used for apoptosis measurement in myocardium.Immunohistochemical assay was used for Bcl-2 and Bax proteins expression detection.② In vitro test An H/R cell model was set up by 3 h hypoxia/3 h reoxygenation.Urantide 0.1,1 and 10 nmol·L^-1 was added just before hypoxia,respectively.Hoechst33258 assay and flow cytometric techniques were used to detect apoptotic cells.RESULTS ① In vivo test Compared with sham group,the number of TUNEL-positive cells in I/R model group significantly increased(P0.01);Bcl-2 protein expression slightly increased with no significant difference,Bax protein expression markedly increased(P0.01),while Bcl-2/Bax ratio in I/R model group significantly decreased(P0.01).Compared with I/R model group,the number of TUNEL-positive cells in urantide 10 and 30 μg·kg^-1 groups was significantly decreased by about 36.6% and 57.2%(P0.05);Bax protein expression markedly decreased(P0.05),while Bcl-2/Bax ratio was significantly augmented(P0.05).Urantide 30 μg·kg^-1 also markedly increased Bcl-2 protein expression(P0.05).② In vitro test Compared with normal control group,the apoptosis rate in H/R model group significantly increased(P0.01).Hoechst33258 assay revealed that urantide 0.1,1 and 10 nmol·L^-1 reduced H/R-induced apoptotic nuclei by about 27.9%,59.0% and 75.4%,respectively(P0.05).Flow cytometric techniques showed that the apoptosis rate was significantly reduced by about 32.8% and 64.7% with administration of urantide 1 and 10 nmol·L^-1(P0.01).CONCLUSIONUrantide exerts an inhibi
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