Format

Send to

Choose Destination
See comment in PubMed Commons below
PLoS One. 2014 Jun 4;9(6):e99049. doi: 10.1371/journal.pone.0099049. eCollection 2014.

Transcription factor Ets1 regulates expression of thioredoxin-interacting protein and inhibits insulin secretion in pancreatic β-cells.

Author information

1
Metabolic Syndrome Research Center, Key Laboratory of Diabetes Immunology, Ministry of Education, the Second Xiangya Hospital, Central South University, Changsha, Hunan, China.
2
Metabolic Syndrome Research Center, Key Laboratory of Diabetes Immunology, Ministry of Education, the Second Xiangya Hospital, Central South University, Changsha, Hunan, China; Department of Pharmacology, University of Texas Health Science Center at San Antonio, San Antonio, Texas, United States of America.

Abstract

Long-term activation of extracellular-regulated kinase (ERK1/2) pathway has been shown to cause glucotoxicity and inhibit insulin gene expression in β-cells. Transcription factor Ets1 is activated by ERK1/2-mediated phosphorylation at the Thr38 residue. We hypothesize that Ets1 plays an important role in mediating ERK1/2 induced glucotoxicity in β-cells. We determined the role of Ets1 in Min6 cells and isolated mouse islets using overexpression and siRNA mediated knockdown of Ets1. The results show that Ets1 was localized in insulin-staining positive cells but not in glucagon-staining positive cells. Overexpression of Ets1 reduced glucose-stimulated insulin secretion in primary mouse islets. Overexpression of Ets1 in Min6 β-cells and mouse islets increased expression of thioredoxin-interacting protein (TXNIP). Conversely, knockdown of Ets1 by siRNA reduced expression of TXNIP in Min6 cells. Ets1 was associated with the txnip promoter in min6 cells and transfection of 293 cells with Ets1 and p300 synergistically increased txnip promoter reporter activity. Moreover, overexpression of Ets1 inhibited Min6 cell proliferation. Our results suggest that Ets1, by promoting TXNIP expression, negatively regulates β-cell function. Thus, over-activation of Ets1 may contribute to diet-induced β-cell dysfunction.

PMID:
24897113
PMCID:
PMC4045976
DOI:
10.1371/journal.pone.0099049
[Indexed for MEDLINE]
Free PMC Article
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Public Library of Science Icon for PubMed Central
    Loading ...
    Support Center