Exendin-4 Promotes Survival of Mouse Pancreatic β-Cell Line in Lipotoxic Conditions, through the Extracellular Signal-Related Kinase 12 Pathway

Abstract EN

Type 2 diabetes is a heterogeneous disorder that develops as a result of relatively inappropriate insulin secretion and insulin resistance.

Increased levels of free fatty acids (FFAs) are one of the important factors for the pathogenesis of type 2 diabetes and contribute to defective β-cell proliferation and increased β-cell apoptosis.

Recently, glucagon-like peptide-1 (GLP-1) receptor agonists have been shown to possess an antiapoptotic effect, by increasing β-cell mass and improving β-cell function.

However, their effects on β-cells in vitro against lipotoxicity have not been elucidated completely.

In this study, we investigated whether the GLP-1 receptor agonist exendin-4 displays prosurvival effects in pancreatic β-cells exposed to chronic elevated FFAs.

Results showed that exendin-4 inhibited apoptosis induced by palmitate in MIN6 cells.

After 24 h of incubation, exendin-4 caused rapid activation of extracellular signal-related kinase 1/2 (ERK1/2) under lipotoxic conditions.

The ERK1/2 inhibitor PD98059 blocked the antilipotoxic effect of exendin-4 on MIN6 cells.

Exendin-4 also inhibited the mitochondrial pathway of apoptosis.

This inhibition is associated with upregulation of BCL-2.

Our findings suggested that exendin-4 may exert cytoprotective effects through activation of ERK1/2 and inhibition of the mitochondrial apoptosis pathway.