四逆汤对大鼠肠缺血再灌注后小肠上皮细胞超微结构的影响

目的: 观察四逆汤(SND)对大鼠肠缺血再灌注后小肠上皮细胞超微结构的影响。方法: 32只SD大鼠随机分为4组(n=8):对照组(仅作假手术处理)、模型组(阻断肠系膜上动脉1 h后再灌注3 h)、SND1组(SND 0.6 g/200 g大鼠灌胃3 d后手术)及SND 2组(SND 1.2 g/200 g大鼠灌胃3 d后手术)。实验时取回肠末端组织行电镜检查,并测量上皮细胞线粒体二维平面形态计量学参数和三维平面形态计量学参数。结果: 电镜下可见对照组上皮细胞柱状排列紧密,微绒毛细长、整齐、无水肿,线粒体丰富,无肿胀;模型组细胞间隙增宽,可见大量凋亡细胞,微绒毛脱落明显,线粒体严重肿胀,嵴断裂,内质网扩张。SND1组与SND2组均可见微绒毛及上皮细胞排列基本整齐,有少量上皮细胞脱落,线粒体轻度肿胀,嵴清。线粒体体视学参数提示模型组上皮细胞单位胞浆内线粒体少,肿胀;而SND1及SND2组线粒体丰富,肿胀轻微。电镜及体视学参数均提示SND对小肠上皮细胞超微结构的影响无明显量效关系。结论: 四逆汤预处理对大鼠肠缺血再灌注后小肠上皮细胞有保护作用。

Effects of Sini decoction on the ultrastructure of small intestinal epithelial cells in rats with intestinal ischemia-reperfusion

AIM: To investigate the effect of Sini decoction (SND)on the ultrastructure of small intestinal epithelial cells in rats with intestinal ischemia-reperfusion. METHODS: Thirty-two Sprague-Dawley rats of both sexes were randomly divided into 4 groups: (1) Control group in which sham operation was performed; (2) Model group in which intestinal I/R was produced by clamping super mesenteric artery(SMA) for 1 hour and declamping SMA for 3 hours; (3) SND1 group in which SD (0.6 g/200 g rat) was given via stomach tube 3 d before intestinal I/R; (4) SND2 group in which SD (1.2 g/200 g rat)was given via stomach tube 3 d before intestinal I/R. A strip of small intestine was taken from distal end of ileum for electron microscopic examination. The two-dimensional structural parameters and three-dimensional structural parameters of mitochondria were calculated. RESULTS: (1)Morphological changes of small intestine: In control group, epithelial cells were orderly arranged, with normal mitochondria and intestinal villi. In model group, the gaps between epithelial cells widened. There were a lot of apoptotic cells. Microvilli were short and swelled. Mitochondria were swelled obviously with broken ridges. Endoplasmatic reticulum was severely dilated. In SND1 and SND2 groups, microvilli and epithelial cells were orderly arranged relatively, mitochondria was slightly swelled. (2) Structural parameters of mitochondria: In model group, there were the least mitochondria and the swelling of mitochondria was severe. In SND1 and SND2 groups, the mitochondria was more than that of model group and the swelling were slight. CONCLUSION: Sini decoction can protect small intestine from ischemia-reperfusion injury without dose-dependent effect.