Lithospermic acid B protects beta-cells from cytokine-induced apoptosis by alleviating apoptotic pathways and activating anti-apoptotic pathways of Nrf2–HO-1 and Sirt1

Abstract

Lithospermic acid B (LAB) has been reported to protect OLETF rats, an established type 2 diabetic animal model, from the development of diabetes-related vascular complications. We investigated whether magnesium lithospermate B (LAB) has a protective role under cytokine-induced apoptosis in INS-1 cells in vitro and whether it slows the development of diabetes in OLETF rats in vivo.Pretreatment with 50μM LAB significantly reduced the 1000U/mL INF-γ and 100U/mL IL-1β-induced INS-1 cell death. LAB significantly alleviated cytokine-induced phosphorylations of p38 and JNK in accordance with a decrease in cleaved caspase-3 activity in beta-cells. LAB also protected against the cytokine-induced caspase-3 apoptotic pathway via significant activation of Nrf2–HO (heme-oxigenase)-1 and Sirt1 expression. OLETF rats treated with 40mg/kg/day LAB showed a significant improvement in glucose tolerance compared to untreated OLETF control rats in vivo.Our results suggest that the cytoprotective effects of LAB on pancreatic β-cells are related with both alleviating apoptotic pathways and activating anti-apoptotic pathways of Nrf2–HO-1 and Sirt1.