【摘要】 目的:研究谷氨酰胺(Gln)对脓毒症模型大鼠心肌细胞的保护作用。方法:取大鼠随机分为假手术(生理盐水)组、模型(生理盐水)组和Gln低、中、高剂量(0.5、0.75、1.0 g/kg)组,每组10只。除假手术组大鼠行假手术外,其余各组大鼠采用盲肠结扎穿孔术复制脓毒症大鼠模型。术后10 min内各组大鼠分别尾iv相应药物,检测术后12 h各组大鼠血清中乳酸脱氢酶(LDH)、磷酸肌酸激酶(CK)、肌钙蛋白Ⅰ(TnⅠ)含量,观察心肌细胞特征和凋亡指数,检测心肌细胞中Bcl-2、p53 m RNA表达。结果:与假手术组比较,模型组大鼠心肌细胞出现坏死的病理现象,血清中CK、LDH、TnⅠ含量和凋亡指数升高,心肌细胞中Bcl-2 m RNA表达减弱、p53 m RNA表达增强,差异有统计学意义(P<0.05)。与模型组比较,Gln中、高剂量组大鼠心肌细胞损伤程度明显减轻,血清中CK、LDH、TnⅠ含量和凋亡指数降低,心肌细胞中Bcl-2 m RNA表达增强、p53 m RNA表达减弱,差异有统计学意义(P<0.05)。结论:Gln可明显改善脓毒症模型大鼠心肌细胞损伤,其机制可能与下调p53基因表达、上调Bcl-2基因表达有关。更多还原

【Abstract】 OBJECTIVE:To study protective effects of glutamine(Gln)on cardiac muscle cell in septic model rats. METHODS:Rats were randomly divided into sham operation group(normal saline),model group(normal saline) and Gln low-dose,medium-dose and high-dose groups(0.5,0.75,1.0 g/kg)with 10 rats in each group. In these groups,septic rat model was induced by cecal ligation and puncture except sham operation group received sham operation. They were given relevant medicine intravenously 10 min after operation,and the characteristics and apoptosis of cardiac muscle cell were observed 12 h after operation. The serum contents of CK,LDH and TnⅠ,and the expression of Bcl-2 and p53 m RNA were all detected. RESULTS:Compared with sham operation group,myocardial necrosis of model group was found,and the serum content of CK,LDH and TnⅠ and apoptotic index increased,and m RNA expression of Bcl-2 in cardiac muscle cell decreased while that of p53 increased,with statistical significance(P<0.05). Compared with model group,myocardial injury relieved significantly in Gln high-dose and medium-dose groups,and serum contents of CK,LDH and TnⅠ and apoptotic index decreased;m RNA expression of Bcl-2 increased in cardiac muscle cell while that of p53 decreased,with statistical significance(P<0.05). CONCLUSIONS:Gln can improve myocardial injury of septic model rats significantly,by a possible mechanism of down-regulating the expression of p53 gene and up-regulating the expression of Bcl-2 gene.更多还原