隔药饼灸对脾虚证大鼠胃组织MEK1/2及ERK1/2的影响

摘要

目的:通过观察隔药饼灸对脾虚证大鼠胃组织分裂原活化蛋白激酶(MEK1/2)及细胞外调节蛋白激酶(ERK1/2)蛋白表达的影响,探讨隔药饼灸治疗脾虚证的可能作用机制.方法:将60只SPF级Sprague-Dawley(SD)大鼠按随机数字表法分为空白对照组(A组)、模型组(B组)、雷尼替丁组(C组)和隔药饼灸组(D组),每组15只.通过200%的大黄浓缩液4℃灌胃制作脾虚证大鼠模型.造模成功后,C组按25 mg/(kg·bw)灌胃给药,D组接受隔药饼灸足三里和中脘治疗,连续治疗8 d.除A组外,其余组大鼠于治疗完成的第二天上午8:00接受消炎痛5 mg/(kg·bw)灌胃,7 h后处死动物,取胃.应用苏木精-伊红(HE)染色,光镜下观察大鼠胃组织病理学改变,采用免疫组化法检测大鼠胃组织MEK1/2及ERK1/2蛋白表达.结果:干预结束后,与A组相比,B组大鼠胃黏膜损伤明显,可见较大的破损、脱落;与B组比较,C组大鼠胃黏膜表面有部分脱落,破损情况改善,D组大鼠胃黏膜表面较完整,脱落及破损明显改善.干预结束后,与A组比较,其他各组大鼠胃组织MEK1/2及ERK1/2蛋白表达明显升高(均P<0.01);与B组比较,C组和D组大鼠胃组织MEK1/2及ERK1/2蛋白表达升高(均P<0.01);与C组比较,D组胃组织MEK1/2及ERK1/2蛋白表达升高(P<0.01).结论:隔药饼灸通过提高胃组织MEK1/2及ERK1/2蛋白表达,激活MEK/ERK信号转导通路,进而促进脾虚证大鼠胃黏膜的修复.%Objective:To observe the effect of herbal cake-partitioned moxibustion on the expressions of mitogen-activated protein kinase (MEK1/2) and extracellular regulatory protein kinase (ERK1/2) in gastric tissues of rats with spleen deficiency syndrome, and to explore the possible mechanisms of herbal cake-partitioned moxibustion in treating spleen deficiency syndrome. Methods:Sixty Sprague-Dawley (SD) rats were randomly divided into a blank control group (group A), a model group (group B), a ranitidine group (group C), and a herbal cake-partitioned moxibustion group (group D) by random digit, 15 rats in each group. Rat models of spleen deficiency syndrome were made by intragastric administration of 4℃ 200% concentrated Da Huang (Radix et Rhizoma Rhei). After successful modeling, the rats in group C were treated with 25 mg/(kg·bw) ranitidine by intragastric adminstration and rats in group D were treated with herbal cake-partitioned moxibustion at Zusanli (ST 36) and Zhongwan (CV 12), for 8 d. Excepted for rats in group A, all the other rats were treated with indomethacin at 5 mg/(kg·bw) at 8:00 a.m. on the second day after finishing all the intervention and sacrificed 7 h later to isolate the stomach. Histopathological changes of the gastric tissues were observed under light microscope after hematoxylin-eosin (HE) staining. The protein expressions of MEK1/2 and ERK1/2 in the gastric tissues were detected by immunohistochemistry. Results:After intervention, the gastric mucosal injury in group B was significantly severer than that in group A, with large breakage and ablating; the damage of gastric mucosa was decreased in group C compared with group B; the gastric mucosal surface remained relatively complete, and the status of breakage and ablating was significantly improved. After intervention, compared with group A, the protein expressions of MEK1/2 and ERK1/2 in gastric tissues of the other groups were significantly higher (P<0.01). Compared with group B, the protein expressions of MEK1/2 and ERK1/2 in group C and D were significantly higher (allP<0.01). Compared with group C, the protein expressions of MEK1/2 and ERK1/2 in group D were significantly higher (P<0.01). Conclusion: Herbal cake-partitioned moxibustion promotes the repair of gastric mucosa in rats with spleen deficiency syndrome, via improving protein expressions of MEK1/2 and ERK1/2 in gastric tissues, as well as activating MEK/ERK signaling pathway.