PINK1 deficiency in β-cells increases basal insulin secretion and improves glucose tolerance in mice.

Abstract:

:The Parkinson's disease (PD) gene, PARK6, encodes the PTEN-induced putative kinase 1 (PINK1) mitochondrial kinase, which provides protection against oxidative stress-induced apoptosis. Given the link between glucose metabolism, mitochondrial function and insulin secretion in β-cells, and the reported association of PD with type 2 diabetes, we investigated the response of PINK1-deficient β-cells to glucose stimuli to determine whether loss of PINK1 affected their function. We find that loss of PINK1 significantly impairs the ability of mouse pancreatic β-cells (MIN6 cells) and primary intact islets to take up glucose. This was accompanied by higher basal levels of intracellular calcium leading to increased basal levels of insulin secretion under low glucose conditions. Finally, we investigated the effect of PINK1 deficiency in vivo and find that PINK1 knockout mice have improved glucose tolerance. For the first time, these combined results demonstrate that loss of PINK1 function appears to disrupt glucose-sensing leading to enhanced insulin release, which is uncoupled from glucose uptake, and suggest a key role for PINK1 in β-cell function.

journal_name

Open Biol

journal_title

Open biology

authors

Deas E,Piipari K,Machhada A,Li A,Gutierrez-del-Arroyo A,Withers DJ,Wood NW,Abramov AY

doi

10.1098/rsob.140051

subject

Has Abstract

pub_date

2014-05-07 00:00:00

pages

140051

issn

2046-2441

pii

rsob.140051

journal_volume

4

pub_type

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