Carbohydrate response element-binding protein (ChREBP) plays a pivotal role in beta cell glucotoxicity.

Abstract:

AIMS/HYPOTHESIS:This study was aimed at the elucidation of the pathogenesis of glucotoxicity, i.e. the mechanism whereby hyperglycaemia damages pancreatic beta cells. The identification of pathways in the process may help identify targets for beta cell-protective therapy. Carbohydrate response element-binding protein (ChREBP), a transcription factor that regulates the expression of multiple hyperglycaemia-induced genes, is produced in abundance in pancreatic beta cells. We hypothesise that ChREBP plays a pivotal role in mediating beta cell glucotoxicity. METHODS:We assessed the role of ChREBP in glucotoxicity in 832/13 beta cells, isolated mouse islets and human pancreas tissue sections using multiple complementary approaches under control and high-glucose-challenge conditions as well as in adeno-associated virus-induced beta cell-specific overexpression of Chrebp (also known as Mlxipl) in mice. RESULTS:Under both in vitro and in vivo conditions, ChREBP activates downstream target genes, including fatty acid synthase and thioredoxin-interacting protein, leading to lipid accumulation, increased oxidative stress, reduced insulin gene transcription/secretion and enhanced caspase activity and apoptosis, processes that collectively define glucotoxicity. Immunoreactive ChREBP is enriched in the nucleuses of beta cells in pancreatic tissue sections from diabetic individuals compared with non-diabetic individuals. Finally, we demonstrate that induced beta cell-specific Chrebp overexpression is sufficient to phenocopy the glucotoxicity manifestations of hyperglycaemia in mice in vivo. CONCLUSIONS/INTERPRETATION:These data indicate that ChREBP is a key transcription factor that mediates many of the hyperglycaemia-induced activations in a gene expression programme that underlies beta cell glucotoxicity at the molecular, cellular and whole animal levels.

journal_name

Diabetologia

journal_title

Diabetologia

authors

Poungvarin N,Lee JK,Yechoor VK,Li MV,Assavapokee T,Suksaranjit P,Thepsongwajja JJ,Saha PK,Oka K,Chan L

doi

10.1007/s00125-012-2506-4

subject

Has Abstract

pub_date

2012-06-01 00:00:00

pages

1783-96

issue

6

eissn

0012-186X

issn

1432-0428

journal_volume

55

pub_type

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