3T3L1脂肪细胞对大鼠胰岛β细胞功能障碍的影响

Objective To investigate the integrated effects of adipocytes on rat beta-cells, differentiated 3T3L1 adipocytes and rat islet cells co-culture system was established. Methods There were two groups; control group ( SD rat islet cells) and co-culture group (islet cells and 3T3L1 adipocytes co-culture system). Islet cells were obtained for determination of (1) insulin secretion and insulin content; (2) mRNA expressions of GLUT2, GCK and Kir6. 2; (3) protein expressions of IR-β, IRS-1 and their tyrosine phosphorylation leveL Results (1) At low glucose, insulin secretion of co-culture group increased compared with that of control group (0.79±0.35) ng·h-1 · ml-1 islet vs (0.38±0.09 ) ng · h-1 · ml-1 · islet, P = 0. 028 . At high glucose, insulin secretion of those two groups was almost at the same level (P =0.760). Compared with control group (2. 84 ±0.92) , stimulation index (SI, insulin release at high glucose/ low glucose) of co-culture system decreased to (1. 57 ±0. 61, P =0.04). And the insulin content of the both groups was almost at the same level (P=0.102). (2) The mRNA of GCK, GLUT2 and Kir6. 2 in co-culture group downregulated to (0. 27 ±0. 11, P = 0. 01) , (0. 34 ±0. 24, P = 0. 009) and (0.41 ± 0. 09, P = 0. 003) compared with control group (mRNA = 1). ( 3) The protein levels of IR-β, IRS-1 and their tyrosine phosphorylation decreased in co-culture system. Conclusions 3T3L1 adipocytes are involved in beta-cell dysfunction, which may facilitate the development of type 2 diabetes. The effects may be mediated by multiple pathways, which include downregulation of GSIS related gene expressions and suppression of islet cell insulin signaling.     

3T3L1脂肪细胞对大鼠胰岛β细胞功能障碍的影响

Objective To investigate the integrated effects of adipocytes on rat beta-cells, differentiated 3T3L1 adipocytes and rat islet cells co-culture system was established. Methods There were two groups; control group ( SD rat islet cells) and co-culture group (islet cells and 3T3L1 adipocytes co-culture system). Islet cells were obtained for determination of (1) insulin secretion and insulin content; (2) mRNA expressions of GLUT2, GCK and Kir6. 2; (3) protein expressions of IR-β, IRS-1 and their tyrosine phosphorylation leveL Results (1) At low glucose, insulin secretion of co-culture group increased compared with that of control group (0.79±0.35) ng·h-1 · ml-1 islet vs (0.38±0.09 ) ng · h-1 · ml-1 · islet, P = 0. 028 . At high glucose, insulin secretion of those two groups was almost at the same level (P =0.760). Compared with control group (2. 84 ±0.92) , stimulation index (SI, insulin release at high glucose/ low glucose) of co-culture system decreased to (1. 57 ±0. 61, P =0.04). And the insulin content of the both groups was almost at the same level (P=0.102). (2) The mRNA of GCK, GLUT2 and Kir6. 2 in co-culture group downregulated to (0. 27 ±0. 11, P = 0. 01) , (0. 34 ±0. 24, P = 0. 009) and (0.41 ± 0. 09, P = 0. 003) compared with control group (mRNA = 1). ( 3) The protein levels of IR-β, IRS-1 and their tyrosine phosphorylation decreased in co-culture system. Conclusions 3T3L1 adipocytes are involved in beta-cell dysfunction, which may facilitate the development of type 2 diabetes. The effects may be mediated by multiple pathways, which include downregulation of GSIS related gene expressions and suppression of islet cell insulin signaling.     

孕妇临产注射安定致新生儿嗜睡拒吮16例报告

安定属苯二氮(艹卓)类的镇静催眠药。有抗焦虑、抗惊厥、抗癫痫、中枢性肌肉松弛和增强麻醉的作用,且毒性小,安全范围大,是临床各科的常用药物。但进入孕妇的体内过程则直接影响胎儿的生长发育,其毒副作用不容疏忽。作者在1984～1995年的12年间,