干细胞因子对糖尿病小鼠小肠平滑肌细胞慢波的影响

Effect of Chenxiang Huaqi Capsules on interstitial cells of Cajal and myenteric plexus in the intestine of diabetic rats

AIM: To explore the protection of Chenxiang Huaqi Capsules against the impairment of interstitial cells of Cajal (ICC) and myenteric plexus in the intestine of diabetic rats.

METHODS: Healthy male SD rats were randomly divided into three groups: control group, diabetes mellitus (DM) group, and DM + Chinese herb group (DM + CH group). DM was induced in rats by a single intraperitoneal injection of streptozotocin (STZ, 60 mg/kg). The DM + CH group was given herb 15.75 g/(kg•d), while the DM group and control group were given equal volumes of distilled water. Four weeks after intervention, all rats were given Indian ink by lavage for determining the small intestinal transit rate. The expression of c-Kit, synaptophysin, and PGP9.5 was studied by immunohistochemistry and quantified using an image analyzer.

RESULTS: Four weeks after treatment, the small intestine transit rate was increased obviously in the DM + CH group compared to the DM group (71.26 ± 5.22 vs 45.52 ± 6.42, P < 0.01), but was still lower than that in the control group (71.26 ± 5.22 vs 80.40 ± 7.33, P < 0.05). The total area and mean optical density value of c-Kit-positive products in the myenteric plexus were significantly increased in the DM + CH group compared to the DM group (443.28 ± 24.40 vs 358.83 ± 35.03, P < 0.01; 0.16 ± 0.02 vs 0.13 ± 0.02, P < 0.01), but were still lower than those in the control group (443.28 ± 24.40 vs 557.28 ± 42.35, P < 0.01; 0.16 ± 0.02 vs 0.18 ± 0.02, P < 0.05). Similar results were also obtained for synaptophsin- and PGP9.5-positive products.

CONCLUSION: Chenxiang Huaqi Capsules may improve intestinal motility by partially reversing abnormal changes in the intestinal ICC and expression of c-Kit, synaptophysin and PGP9.5 in diabetic rats.