Abstract:Objective: To investigate the effect of cryptotanshinone (CT) on the injury of glomerular endothelial cells (GEC) induced by high glucose by regulating silent information regulator 1 (Sirt1)/forkhead box protein O1 (FoxO1) signal pathway. Methods: GEC was divided into control group (NR group,5mmol/L D-glucose), high glucose group ( HG group, 30mmol/L D-glucose), L-CT group ( GEC treated with 1 μmol/L CT+30 mmol/L D-glucose), M-CT group (GEC treated with 5 μmol/L CT+30 mmol/L D-glucose), H-CT group (GEC treated with 10 μmol/L CT+30 mmol/L D-glucose), and SIRT1-IN-1 group (GEC treated with 10 μmol/L CT+30 mmol/L D-glucose+0.05 mol/L Sirt1/FoxO1 signal pathway inhibitor SIRT1-IN-1); MTT assay was used to detect the effects of CT on the cytotoxicity and viability of GEC cells; the levels of GEC inflammatory factors and oxidative stress indicators were detected by ELISA; the apoptosis of GEC was detected by flow cytometry; Western blot was used to detect the expression of autophagy, apoptosis, fibrosis factors and Sirt1/FoxO1 pathway related proteins in cells. Results: 0-40 μmol/L CT had no obvious toxic effect on GEC. Compared with NR group, OD570 value, content of SOD, the levels of Bcl-2, Beclin1, LC3-Ⅱ/Ⅰ, p-Sirt1/Sirt1, p-FoxO1/FoxO1 proteins in HG group decreased obviously (P<0.05), the apoptosis rate of GEC, the levels of Bax, cleaved Casase-3, Col-I, TGF-1 proteins, contents of IL-6, IL-8, TNF-α, and MDA increased obviously (P<0.05); compared with HG group, the proliferation activity, the levels of autophagic protein and pathway protein in L-CT group, M-CT group and H-CT group increased obviously (P<0.05), the levels of inflammatory reaction, oxidative stress, fibrosis factor protein and apoptosis rate decreased obviously (P<0.05); SIRT1-IN-1 eliminated the beneficial effect of CT on GEC. Conclusion: CT may improve GEC injury induced by high glucose by up-regulating Sirt1/FoxO1 signal pathway.