糖尿病结肠动力障碍近端结肠平滑肌细胞相关凋亡基因表达的研究

目的:探讨糖尿病(DM)结肠动力障碍近端结肠平滑肌细胞的凋亡变化。方法:雄性SD大鼠36只随机分为正常对照6周组、正常对照10周组、DM6周组和DM10周组,每组9只。检测空腹血糖(FBG)、胃肠推进率、血清胰岛素(FINS),HE染色观察近端结肠平滑肌的变化,应用荧光实时定量PCR(Realtime-qPCR)检测大鼠近端结肠平滑肌细胞的bax、bcl-2及caspase-3的mRNA表达情况。结果:(1)DM组大鼠较同时间点正常对照组大鼠空腹血糖增高,胃肠推进率及血清胰岛素降低,近端结肠平滑肌变薄,bax及caspase-3的mRNA表达增强,bcl-2的mRNA表达降低,差异有统计学意义(P<0.01)。(2)DM10周组大鼠较DM6周组大鼠的空腹血糖增高,胃肠推进率及血清胰岛素降低,近端结肠平滑肌变薄,bax及caspase-3的mRNA表达增强,bcl-2的mRNA表达降低,差异有统计学意义(P<0.05)。结论:DM结肠动力障碍与近端结肠平滑肌细胞的凋亡密切相关,且细胞凋亡随病程发展而加重。

Apoptotic Gene Expression in Proximal Colon Smooth Muscle Cells of Diabetic Colon Dysmotility

Objective:To explore the alteration of apoptosis of proximal colon smooth muscle cells in diabetic colon dysmotility.Methods:Thirty-six male SD rats were randomly divided into 4 groups including normal control 6-week group,normal control 10-week group,diabetes mellitus(DM) 6-week group and DM 10-week group(n=9 for each).The levels of fasting blood glucose(FBG),gastrointestinal transit rate and the serum level of fasting insulin(FINS) were detected.The changes in the smooth muscle of proximal colon were exam...