MG-132对溴氰菊酯致大鼠海马细胞凋亡的保护作用

目的 研究蛋白酶体抑制剂MG-132对拟除虫菊酯类农药溴氰菊酯(deltamethfin,DM)致大鼠海马细胞凋亡的保护作用.方法 雄性Wistar大鼠40只,随机分为4组,每组10只.对照组(1 ml/kg橄榄油),DM组(12.5 mg/kg DM),MG-132+DM组(0.5 mg/kg MG-132处理2 h后再以DM 12.5mg/kg染毒),MG-132(0.5 mg/kg MG-132)组,以腹腔注射方式分别给予染毒处理.DM染毒24 h后大鼠断头取海马,流式细胞术检测细胞凋亡率.免疫印迹(Western bloting)法检测bcl-2蛋白的含量及酶标仪检测casptme-3活力.结果 MG-132+DM组海马细胞凋亡率(27.29%+2.41%)明显低于DM组(19.94%±2.07%),差异有统计学意义(P<0.05).DM组bcl-2蛋白表达的灰度值为0.43±0.06,MG-132+DM组bcl-2表达的灰度值为2.01±0.23,两组比较,差异有统计学意义(P<0.01).DM组海马细胞cas-pase-3活力为5.26±0.43,MG-132+DM组为4.55±0.46,两组比较,差异有统计学意义(P<0.05).结论 在该实验条件下,MG-132对DM引起的大鼠海马细胞凋亡有一定保护作用,泛素-蛋白酶体途径可能参与DM诱发大鼠海马细胞凋亡的过程.

Protected effects of MG-132 on apoptosis induced by deltamethrin in rat's hippocampus

Objective To study the protective effect of MG-132 on hippocampus cells apoptosis induced by deltamethrin (DM), one kind of pyrethroid pesticide. Methods 40 Male wistar rats were randomly divided into four groups: olive oil control, DM treated alone (12.5 mg/kg), MG-132(0.5mg/kg) plus DM group, MG-132 treated 2h plus olive oil. After 24h treatment of DM, the hippocampus was taken out to detect the apoptotic cell rate, the level of bcl-2 and Caspase-3 activity. Results Compared with DM treated alone group (27.29%±2.41%), the apoptotic cell rate in MG-132 + DM group(19.94%±2.07%) was increased(P<0.05), bcl-2 expression was enhanced [(0.43±0.06)vs.(2.01 ±0.23)] (P<0.05) and the activity of Caspase-3 was decreased significantly (P<0.05) in MG-132 treated 2h plus DM group [(4.55±0.46) vs.(3.73±0.35)]. Conclusion MG-132 can protect hippocampus cells against apoptosis induced by deltamethrin.