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目的观察丹酚酸B（Salvianolic acid B，Sal B）对间歇性高糖诱导的大鼠胰岛素瘤细胞（INS-1）c-Jun氨基末端激酶（JNK）活化和细胞凋亡的影响。方法 INS-1细胞与丹酚酸B预孵24 h后暴露于间歇性高糖（11.1 mmol·L－112 h，33.3 mmol·L－112 h）72 h。MTT法测定细胞活力，ELISA 法测定葡萄糖刺激的胰岛素分泌能力，荧光探针DCFH-DA检测细胞内活性氧（ROS）水平，流式细胞术检测细胞凋亡水平，Western blot法检测胰十二指肠同源盒-1（PDX-1）蛋白表达和JNK活化水平。结果丹酚酸B可明显减轻间歇性高糖诱导的INS-1细胞损伤和凋亡（P＜0.05，P＜0.01），提高葡萄糖刺激的胰岛素分泌能力（P＜0.05，P＜0.01）；与丹酚酸B预孵可明显降低细胞内ROS水平、抑制JNK活化，并提高PDX-1蛋白表达水平（P＜0.05，P＜0.01）。结论丹酚酸B可有效减轻间歇性高糖诱导的INS-1细胞损伤和凋亡，提高胰岛素分泌水平，其机制可能与降低细胞内ROS水平、抑制JNK活化和上调PDX-1蛋白表达有关。“,”Aim To investigate the effect of salvianolic acid B (Sal B)on c-Jun N-terminal kinase (JNK)ac-tivation and apoptosis of INS-1 cells induced by inter-mittent high glucose.Methods INS-1 cells were pre-incubated with Sal B for 24 h,followed by exposure to intermittent high glucose (IHG,11.1 mmol·L-1 12 h,33. 3 mmol·L-1 12 h)for 72 h.Cell viability was assessed by MTT assay and cell apoptosis was evalua-ted by flow cytometry.Glucose induced insulin secre-tion capacity and intracellular reactive oxygen species (ROS)contents were measured by enzyme linked im-munosorbent assay (ELISA)and a fluorescent probe DCFH-DA,respectively.Levels of JNK activation and PDX-1 protein expression were determined by Westernblot analysis.Results Sal B significantly alleviated IHG-induced cell injury and apoptosis,with glucose induced insulin secretion capacity improved evidently (P<0.05 or P<0.01).Preincubation with Sal B no-tably decreased intracellular ROS and JNK activation in INS-1 cells,while the level of PDX-1 protein was in-creased markedly (P<0.05 or P<0.01 ).Conclu-sion Sal B is capable of ameliorating IHG-induced cell injury and apoptosis in INS-1 cells,which might be derived from suppression of JNK activation and up-regulation of PDX-1 protein expression.