糖尿病大鼠小肠Cajal间质细胞超微结构的改变

Changes of ultrastructure of interstitial cells of Cajal in the small intestine of diabetic rats

目的 明确糖尿病大鼠小肠Cajal间质细胞 (interstitialcellsofCajal,ICC)超微结构的变化 ,探讨糖尿病小肠运动功能改变原因。方法 用链尿佐菌素建立大鼠糖尿病模型 ,3个月后测定小肠传输速度 ,对小肠组织进行透射电镜观察。结果 糖尿病大鼠小肠传输速度明显延迟 ,Cajal间质细胞与其他细胞间的缝隙连接显著减少、结构破坏、连接松散 ;细胞器变性、减少 ;胞质广泛溶解 ;核周间隙增宽。结论 糖尿病Cajal间质细胞变性可能是导致小肠运动功能低下的一个重要原因。

Objective To clarify the changes of ultrastructure of interstitial cells of Cajal in the small intestine of diabetic rats. Methods Rats were randomly divided into diabetic group and control group. The rate of the small intestinal transit was measured and the tissues of the small intestine were observed by transmission electron microscopy at 3 months after the establishment of rat model of diabetics. Results In the diabetic rats, the rate of small intestinal transit was delayed as compared with that in the control group. The number of the gap junction of interstitial cells of Cajal in the small intestine of diabetic rats decreased significantly, and the rest structures were damaged. Damaged organelles and formation of vacuoles were also found. Conclusion The changes of ultrastructure of interstitial cells of Cajal in the small intestine may be one of the mechanisms resulting in slow rate of the small intestinal transit in diabetic rats.