关键词: 胰岛素敏感性, 脂联素受体激动剂, PI3K, 小鼠成肌细胞株(C2C12)

Abstract: Objective: To observe the effect of AdipoRon, an adiponin receptor agonist, on insulin sensitivity in mouse myoblast cell line (C2C12) and to explore its mechanism.Methods: C2C12 was induced to differentiate into myoblasts by using horse serum. Then the cells were divided into 6 groups (9 double wells):blank control group, high dose AdipoRon group, low dose AdipoRon group, insulin group and the low dose AdipoRon with PI3K inhibitor (phosphatidylinositol 3 kinase) group and the insulin with PI3K inhibitor group. After cultured for 12 h, the supernatant was collected and glucose consumption was measured. Cell proliferation was tested by using CCK8. In the 6-well plate, C2C12 was induced to differentiate into myoblasts. The drug was incubated for 12 h and the mRNA level of GLUT4 was detected by RT-PCR.Results: Compared with the blank control group, the levels of glucose consumption in high dose AdipoRon group, low dose AdipoRon group and insulin group was increased significantly (P<0.05). After adding PI3K inhibitor, the levels of glucose consumption in the above mentioned three groups were not different from that in blank control group. high dose AdipoRon group, low dose AdipoRon group and insulin group had proliferation, but only the insulin group was statistically significant (P<0.05). Compared with the control group, the levels of GLUT4 mRNA in AdipoRon high dose group, low dose AdipoRon group and insulin group were all higher than those in control group (P<0.05). After adding PI3K inhibitor, GLUT4 mRNA level was not statistically significant compared with blank control group.Conclusion: AdipoRon can increase the consumption of glucose without affecting cell proliferation, which may play a role in improving insulin sensitivity, but the specific mechanism remains to be further studied.

Key words: insulin resistance, AdipoRon, PI3K, mouse myoblast cell line (C2C12)