蜜环菌菌索多糖对四氧嘧啶致胰岛细胞损伤的保护作用

目的研究蜜环菌菌索多糖(AMP-1)对四氧嘧啶(AXN)致胰岛细胞损伤的影响。方法培养大鼠胰岛素瘤细胞(INS-1),以AXN损伤细胞,培养液中加入不同浓度的AMP-1(2、10、50、100、500、1000mg.L-1),用MTT法测细胞存活率;使用放免法检测不同浓度AMP-1对INS-1细胞葡萄糖刺激性的胰岛素分泌量的变化;用比色法检测INS-1细胞一氧化氮(NO)、一氧化氮合酶(NOS)、超氧化物歧化酶(SOD)、丙二醛(MDA)、谷胱甘肽(GSH)等指标的变化。结果AMP-1可减少AXN对INS-1细胞的损伤,AMP-1处理组的INS-1细胞存活率增加;在5.6mmol.L-1、16.7mmol.L-1葡萄糖刺激下,AMP-1(50、100、500、1000mg.L-1)剂量依赖性地促进了INS-1细胞葡萄糖刺激性的胰岛素分泌;AMP-1能使INS-1细胞NOS活性降低,MDA和NO含量减少,同时增强了SOD的活性,增加了GSH的含量。结论一定浓度范围的AMP-1对葡萄糖刺激下INS-1细胞的胰岛素分泌的促进作用,可能与AMP-1能够增加细胞清除自由基能力有关。

Polysaccharide from the rhizomorph of Armillaria mella (AMP-1) protects INS-1 cells from alloxan injury

Aim To investigate the protective effects of polysaccharides from the rhizomorph of Armillaria mella(AMP-1) on alloxan injured INS-1 cells.Methods Graded concentrations of AMP-1(2,10,50,100,500,1 000 mg·L-1) were added into the culture medium of alloxan injured INS-1 cells.The survival rate was measured by MTT assay.The amount of glucose-stimulated insulin secretion in different concentrations of AMP-1 was determined by radioimmunoassay(RIA).SOD and NOS activity,NO,MDA and GSH production were assayed colorimetrically.Results AMP-1 could reduce oxidative injuries induced by alloxan in INS-1 cells.The survival rate of cells treated with AMP-1 increased significantly.In the presence of 5.6 mmol·L-1 or 16.7 mmol·L-1 glucose,AMP-1(50,100,500,1 000 mg·L-1)increased glucose-induced insulin secretion in INS-1 cells in a dose-dependent manner.NOS levels and the production of NO and MDA decreased significantly by AMP-1,while SOD levels and the production of GSH increased.Conclusions AMP-1 promoted glucose-induced insulin secretion in INS-1 cells by increasing the abilities of scavenging the free radicals induced by alloxan.