丹参多酚酸盐对实验性肝硬化大鼠肠黏膜屏障功能的改善作用

目的：观察丹参多酚酸盐对肝硬化大鼠肠黏膜屏障功能的影响。方法：SD大鼠40%CCl4-橄榄油溶液建立肝硬化大鼠模型,随机分成4组：模型对照组、丹参多酚酸盐治疗低、中、高剂量组,每天分别腹腔注射葡萄糖溶液、丹参多酚酸盐12、24、48mg/kg,持续2周。另取10只大鼠作正常对照。治疗结束后观察各组大鼠死亡率,光度法测定门静脉血清内毒素水平,光镜下观察肠黏膜形态学改变,比较肠黏膜形态学指标,免疫组织化学染色测肠黏膜分泌型免疫球蛋白A（sI-gA）染色及积分光密度值变化。结果：模型对照组大鼠死亡率为42.86%,丹参多酚酸盐高剂量组死亡率为0;各组大鼠门静脉血清内毒素水平模型对照组最高,与其相比,丹参多酚酸盐低剂量组内毒素水平降低（P〈0.05）,中剂量组与高剂量组显著降低（P〈0.01）。模型对照组回肠绒毛萎缩、脱落、断裂,黏膜变薄,治疗组肠黏膜逐渐修复,绒毛变整齐,绒毛高度、黏膜、全层厚度比模型对照组增长、变厚（P〈0.01）。模型对照组sIgA免疫组化信号表达弱,治疗组染色表达增强。模型对照组积分光密度值最低,中剂量治疗组升高（P〉0.05）,高剂量组显著升高（P〈0.01）。结论：丹参多酚酸盐能降低肝硬化大鼠门静脉血内毒素水平,促进肠黏膜上皮结构损伤恢复,保持形态完整,增强黏膜局部免疫功能。

Improvement effect of salvianolate on small intestinal mucosal barrier in cirrhotic rats

AIM：To investigate the effect of salvianolate on small intestinal mucosal barrier in rats with CCl4-induced liver cirrhosis. METHODS： Cirrhosis was induced in rats using CCl4 （0.3 mL/kg ）. Rats were divided randomly into four groups：untreatmeat, low-dose salvianolate（12 mg/kg）, medium-dose salvianolate（24 mg/kg）, and high-dose salvianolate（48 mg/kg）. They were all treated for 2 weeks.Another 10 healthy rats were enrolled as normal control. Mortality of cirrhotic rats in each group were evaluated after treatment. Serum samples were collected from the portal vein for the detection of endotoxin. Tissue samples from the ileocecum were observed under light microscopy for morphological changes.A contrasting study on the expression of secretary immunoglobulin A（sIgA） were performed in each group by immunohistochemical staining method.RESULTS：The mortality of cirrhotic rats in the untreatmeat group was 42.86%. No cirrhotic rat died in the high-dose salvianolate group. The serum endotoxin level was highter in the untreatmeat group than that in salvianolate group（P0.05）. Intestinal mucosal and villous atrophy were observed in the untreatmeat group , with necrosis and shedding of the intestinal mucosal epithelium. These pathological changes were reversed in the salvianolate-treated groups.The expression of sIgA in intestinal mucosa were reduced obviously in the untreatmeat group, in compared with those in the salvianolate-treated groups and healthy rats group. The integral optical density of immunohistochemical staining image in untreatmeat group was obviously lower than that in high-dose salvianolate-treated group （P0.01）. CONCLUSION： Salvianolate is helpful for reducing endotoxin level ,ameliorating injury of intestinal mucosa,enhancing immune function of intestinal mucosa in rats with CCl4 induced cirrhosis,and therefore improving the barrier function of intestinal mucosa.