环孢素A对正常及自发性糖尿病仓鼠胰岛细胞分泌功能的短期影响

目的　探讨环孢素 A( Cs A )对胰岛α、β细胞的作用 ,为临床合理用药提供理论依据。方法　采用改良Kanatsuna及 knudsen柱细胞表面灌注系统 ,动态观察低浓度 ( 2 5～ 10 0 ng/ml) Cs A对正常及自发性糖尿病 ( DM)中国短尾黑线仓鼠离体胰岛α、β细胞分泌功能的短期影响。结果　 DM仓鼠胰岛β细胞无论在静态时或 16.7mm ol/L D-葡萄糖 ( G)刺激下胰岛素 ( Ins)的分泌量均较正常仓鼠明显降低 ( P<0 .0 5 ) ,而静态胰高糖素 ( Glc)分泌量则较正常仓鼠明显增高 ( P<0 .0 5 )。将小剂量 ( 2 5～ 10 0 ng/ml) Cs A加入胰岛细胞中培养 2 4h后 ,培养液 Ins和Glc含量与对照组 (未加 Cs A)相比无统计学差异 ( P>0 .0 5 ) ,但 Cs A处理 2 4h后的正常仓鼠胰岛β细胞对 16.7mm ol/L D-葡萄糖刺激的反应减弱。结论　 DM仓鼠发病可能与胰岛细胞分泌功能异常有关。小剂量 ( 2 5～ 10 0 ng/ml) Cs A对正常及 DM仓鼠离体胰岛α、β细胞分泌功能无明显直接影响。胰岛细胞与 Cs A作用 2 4h后β细胞储备功能降低。 Cs A在体外对 Ins释放的影响 ,除剂量因素外 ,还与作用时间有关

Short-term Effects of Cyclosporine A on the Function of Pancreatic Islet Cells in Normal and Spontaneous Diabetic Chinese Hamsters

Objective To examine the effects of low dose (25~100 ng/ml) CsA on the hormonal secretion of the pancreatic islet cells isolated from normal and spontaneously inherited diabetic Chinese hamsters. Methods A modified kanatsuna and Knudsen's column perifusion system was developed. The secretions of Insulin (Ins) and glucagon (Glc) of the cultured islet cells responding to the glucose stimulations were tested after pretreated with different doses of CsA for 24 hours. Results The secretions of Ins of the diabetic islet cells with and without glucose stimulations (16.7 mmol/L) both reduced significantly compared to the normal controls (P<0.05). In contrast, the static secretions of Glc increased significantly in the diabetes islet cells (P<0.05). The response (Ins release) of normal islets to glucose stimuli was significantly inhibited after 24-hour pretreatment with CsA (25-100 ng/ml, P<0.05), while the concentrations of Ins and Glc detected in the culture fluids did not differ from the controls (P>0.05). Conclusion Abnormal islet function exists in diabetic hamsters charactarized by impairment of Ins secretion and increase of Glc secretion. Low dose CsA has no significant effects on the secretions of Ins and Glc, but it inhibits the response of the islets to the glucose stimuli.