Downregulation of Bcl-2 Expression by miR-34a Mediates Palmitate-Induced Min6 Cells Apoptosis

Abstract EN

Recent studies have demonstrated that the expression of miR-34a is significantly upregulated and associated with cell apoptosis in pancreatic β-cell treated with palmitate.

Nevertheless, the underlying detailed mechanism is largely unknown.

Here, we showed that miR-34a was significantly induced in Min6 pancreatic β-cell upon palmitate treatment.

Elevated miR-34a promoted Min6 cell apoptosis.

Intriguingly, ectopic expression of miR-34a lowered the expression of Bcl-2, an antiapoptotic protein.

Luciferase reporter assay indicated the direct interaction of miR-34a with the Bcl-2 3′-UTR.

Moreover, downregulated expression of Bcl-2 induced by palmitate could be restored by inhibition of miR-34a.

We conclude that direct suppression of Bcl-2 by miR-34a accounts for palmitate-induced increased apoptosis rate in pancreatic β-cell.