The role of peroxisome proliferator-activated receptor-beta/delta in epidermal growth factor-induced HaCaT cell proliferation.

Abstract:

:Epidermal growth factor (EGF) has been shown to be a potent mitogen for epidermal cells both in vitro and in vivo, thus contributing to the development of an organism. It has recently become clear that peroxisome proliferator-activated receptor-beta/delta (PPARbeta/delta) expression and activation is involved in the cell proliferation. However, little is known about the role of PPARbeta/delta in EGF-induced proliferation of HaCaT keratinocytes. In this study, HaCaT cells were cultured in the presence and absence of EGF and we identified that EGF induced an increase of PPARbeta/delta mRNA and protein level expression in time-dependent and dose-dependent manner, and AG1487, an EGF receptor (EGFR) special inhibitor, caused attenuation of PPARbeta/delta protein expression. Electrophoretic mobility shift assay (EMSA) revealed that EGF significantly increased PPARbeta/delta binding activity in HaCaT keratinocytes. Antisense phosphorothioate oligonucleotides (asODNs) against PPARbeta/delta caused selectively inhibition of PPARbeta/delta protein content induced by EGF and significantly attenuated EGF-mediated cell proliferation. Treatment of the cells with L165041, a specific synthetic ligand for PPARbeta/delta, significantly enhanced EGF-mediated cell proliferation. Finally, c-Jun ablation inhibited PPARbeta/delta up-regulation induced by EGF, and chromatin immunoprecipitation (ChIP) showed that c-Jun bound to the PPARbeta/delta promoter and the binding increased in EGF-stimulated cells. These results demonstrate that EGF induces PPARbeta/delta expression in a c-Jun-dependent manner and PPARbeta/delta plays a vital role in EGF-stimulated proliferation of HaCaT cells.

journal_name

Exp Cell Res

authors

Liang P,Jiang B,Yang X,Xiao X,Huang X,Long J,Zhang P,Zhang M,Xiao M,Xie T,Huang X

doi

10.1016/j.yexcr.2008.06.013

subject

Has Abstract

pub_date

2008-10-15 00:00:00

pages

3142-51

issue

17

eissn

0014-4827

issn

1090-2422

pii

S0014-4827(08)00245-0

journal_volume

314

pub_type

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