大黄附子汤改善重症急性胰腺炎大鼠肠道动力障碍的机制研究

目的:通过观察大黄附子汤对重症急性胰腺炎(Severe acute pancreatitis, SAP)致肠道动力障碍大鼠血清胃动素、回肠Cajal间质细胞及胃动素受体的影响，探讨大黄附子汤改善肠道动力障碍的作用及机制。方法:清洁级雄性Sprague-Dawley大鼠，18只，随机（随机数字法）分为对照组、SAP组及大黄附子汤治疗组（n=6）。采用逆行胰胆管注射4％牛磺胆酸钠制备SAP大鼠模型。对照组开腹后，找到胰腺轻微翻动数次后关腹；SAP组在造模后12、24 h分别给予2 mL生理盐水（37℃）灌肠；治疗组在造模后12、24 h分别给予2 mL大黄附子汤（37℃）灌肠。于造模48 h后，各组大鼠取腹主动脉血，测定血清内毒素及淀粉酶含量，使用酶联免疫吸附法测定血清胃动素水平；取胰腺、回肠组织行苏木精伊红染色观察病理变化；采用免疫组织化学法检测回肠平滑肌组织中Cajal间质细胞(interstitial cells of cajal, ICC)表达蛋白c-kit及胃动素受体(Motilin receptor, MTL-R)蛋白的表达。结果:与对照组相比，SAP组大鼠血清内毒素、淀粉酶水平均显著增高(504.98±88.81) pg/mL vs. (17.76±5.01) pg/mL; (532.28±66.53) U/L vs. (69.45±3.61) U/L,均 P<0.05]，而血清胃动素水平显著降低(195.4±6.7) ng/L vs. (301±8.10) ng/L, P<0.05]，ICC表达蛋白c-kit及MTL-R免疫组织化学评分降低( P<0.05)；与SAP组相比，大黄附子汤治疗组大鼠血清内毒素、淀粉酶水平均显著降低(189.9±38.23) pg/mL vs. (504.98±88.81) pg/mL; (294.23±25.66) U/L vs. (532.28±66.53) U/L,均 P<0.05]，而血清胃动素水平显著升高(264.2±8.3) ng/L vs. (195.4±6.7) ng/L, P<0.05]，同时c-kit及MTL-R免疫组织化学评分升高( P<0.05)。 结论:大黄附子汤通过促进胃动素的分泌、提高ICC细胞的活性及MTL-R的表达而改善SAP大鼠肠道动力障碍。

Study on the mechanism of Dahuangfuzi decoction in improving intestinal motility disorder of rats with severe acute pancreatitis

Objective:To explore the mechanism of Dahuangfuzi decoction on intestinal motility disorder by observing its effect on serum motilin, Cajal interstitial cells and motilin receptor in rats with severe acute pancreatitis (SAP).Methods:Eighteen clean male Sprague-Dawley rats were randomly divided into the control group, SAP group and Dahuangfuzi group ( n=6 each group). The SAP rat model was prepared by retrogradely injected 4% sodium taurocholate into cholangiopancreatic duct. The rats in the SAP group were given 2 mL normal saline (37℃) enema at 12 and 24 h after operation. The rats in the Dahuangfuzi group was given 2 mL Dahuangfuzi decoction (37℃) enema at 12 and 24 h respectively. For the control group, the pancreas was exposed in the same way and then the abdomen was closed. Forty-eight h after operation, the abdominal aorta blood samples were taken for determination of serum endotoxin and amylase, and for detection of serum motilin by enzyme-linked immunosorbent assay (ELISA); the pathological changes of pancreas and ileum were observed by hematoxylin-eosin (HE) staining. The expression of c-kit and motilin receptor protein in ICC in ileum tissue was detected by immunohistochemistry. Results:Compared with the control group, the levels of serum endotoxin and amylase in the SAP group were significantly higher (504.98±88.81) pg/mL vs. (17.76±5.01) pg/mL; (532.28±66.53) vs. (69.45±3.61) U/L, P<0.05], while the levels of serum motilin were significantly lower (195.4±6.7) ng/L vs. (301±8.10) ng/L, P<0.05], and the scores of c-kit and motilin receptor protein were decreased ( P<0.05); compared with the SAP group, the levels of serum endotoxin and amylase in the Dahuangfuzi group were significantly reduced (189.9±38.23) pg/mL vs. (504.98±88.81) pg/mL; (294.23±25.66) vs. (532.28±66.53) U/L, P<0.05], while the levels of serum motilin were significantly increased (264.2±8.3) ng/L vs. (195.4±6.7) ng/L, P<0.05], and the scores of c-kit and motilin receptor protein were increased ( P<0.05). Conclusions:Dahuangfuzi decoction can improve the intestinal motility of SAP rats by promoting the secretion of motilin, increasing the activity of ICC cells and the expression of motilin receptor.