中文摘要：

目的：研究卡维地洛对急性柯萨奇B3（CVB3）病毒性心肌炎小鼠的儿茶酚胺及炎症因子IL-6表达水平的影响。方法： 随机将80只雄性BALB/C小鼠分为3组：正常对照组（n=20），心肌炎组（n=30），卡维地洛组（n=30）。后两组经腹腔接种CVB3诱发急性病毒性心肌炎，感染 24 h 后卡维地洛组每日灌胃给予卡维地洛 10 mg/kg，连续 14 d。于接种第7和14天随机从各组抽取8只小鼠取血后处死并留取心脏等标本。比较干预组与对照组心肌病理改变，采用高效液相色谱电化学法检测去甲肾上腺素含量，采用RT-PCR法检测心肌IL-6mRNA的表达，采用酶联免疫吸附实验方法检测心肌IL-6蛋白的表达。结果：与心肌炎组比较，卡维地洛组心肌病理损伤明显减轻。与正常组比较，病毒性心肌炎小鼠血浆去甲肾上腺素明显升高，卡维地洛干预后小鼠血浆去甲肾上腺素明显下降（P〈0．05）。与正常组比较，心肌炎组心肌IL-6表达明显上调（P〈0．05）。与心肌炎组比较，卡维地洛组IL-6表达明显下调（P〈0．05）。结论：卡维地洛通过抑制儿茶酚胺对心肌的毒性作用以及下调心肌IL-6表达水平，减轻心肌炎小鼠的心肌损害。

英文摘要：

AIM： To examine the effects of carvedilol on plasma norepinephrine and myocardial IL-6 production in murine model with the coxsackievirus B3 （CVB3）-induced viral myocarditis. METHODS： Eighty male BALB/C mice were divided into three groups randomly, including normal group, carvedilol group, myocarditis group. The latter two groups were intraperitoneally inoculated with CVB3. Starting 24 h after infection carvedilol was administered orally in a dose of 10 mg · kg-1 d ·-1 for 14 days continuously. Myocarditis group and normal group were used with same dose PBS. Eight mice who were randomly taken from each groups were kill- ed on day 7 or 14. Myocardial histopathology changes, the heart weight/body weight ratio, the plasma norepinephrine, the mRNA and protein expression of myocardial IL-6 were studied. RESULTS： Carvedilol significantly attenuated myocardial lesions and decreased the heart weight/body weight ratio（P〈0.05）. The plasma norepinephrine was decreased, the mRNA and protein expression of IL-6 was down regulated remarkably in the carvedilol group compared with the myocarditis group （P 〈 0.05）. CONCLUSION： Carvedilol protects against CVB3-induced viral myocarditis in mice. Carvedilol exerts some of its beneficial effects by decreasing the plasma catecholamine levels and down-regulating the expression of IL-6.