The protective role of peroxisome proliferator-activated receptor γ coactivator-1α in hyperthyroid cardiac hypertrophy.

Abstract:

:Heart failure is a major cause of death throughout the world. Hyperthyroidism has been shown to induce cardiac hypertrophy, which is a contributing factor to heart failure. However, the mechanism underling effect of thyroid hormone is not completely clear. The present study investigates the role of peroxisome proliferator-activated receptor (PPAR) γ coactivator-1α (PGC-1α) in cardiac hypertrophy induced by Triiodothyronine (T3). We investigated PGC-1α mRNA expression in rat hearts exposed to T3 in vivo and ex vivo. Surprisingly, we found that the extended periods of T3 treatment led to an increase in PGC-1α expression compared to shorter treatment times, which resulted in a reduction of PGC-1α expression. Mechanistic studies showed that suppression of PGC-1α by small interfering RNA in cardiomyocytes amplified the cellular hypertrophic response to T3 stimulation, whereas overexpression of PGC-1α was protective. Furthermore, we presented evidence to show that T3 decreased PGC-1α expression via p38 mitogen-activated protein kinases (MAPK) pathway. Our studies also revealed that overexpression of PGC-1α in cardiomyocytes inhibited basal and T3-induced p38 MAPK phosphorylation. These data indicate for the first time that PGC-1α plays protective role in T3-induced cardiac hypertrophy and that hypertrophic growth induced by T3 involves a regulatory pathway between PGC-1α and p38 MAPK.

journal_name

J Cell Physiol

authors

Xu W,Hou D,Jiang X,Lu Z,Guo T,Liu Y,Wang D,Zen K,Yu B,Zhang CY

doi

10.1002/jcp.24015

subject

Has Abstract

pub_date

2012-09-01 00:00:00

pages

3243-53

issue

9

eissn

0021-9541

issn

1097-4652

journal_volume

227

pub_type

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