LIM-Only Protein FHL2 Is a Negative Regulator of Transforming Growth Factor β1 Expression.

Abstract:

:Transforming growth factor β1 (TGF-β1) is a master cytokine in many biological processes, including tissue homeostasis, epithelial-to-mesenchymal transition, and wound repair. Here, we report that four and a half LIM-only protein 2 (FHL2) is a critical regulator of TGF-β1 expression. Devoid of a DNA-binding domain, FHL2 is a transcriptional cofactor that plays the role of coactivator or corepressor, depending on the cell and promoter contexts. We detected association of FHL2 with the TGF-β1 promoter, which showed higher activity in Fhl2-/- cells than in wild-type (WT) cells in a reporter assay. Overexpression of FHL2 abrogates the activation of the TGF-β1 promoter, whereas the upregulation of TGF-β1 gene transcription correlates with reduced occupancy of FHL2 on the promoter. Moreover, ablation of FHL2 facilitates recruitment of RNA polymerase II on the TGF-β1 promoter, suggesting that FHL2 may be involved in chromatin remodeling in the control of TGF-β1 gene transcription. Enhanced expression of TGF-β1 mRNA and cytokine was evidenced in the livers of Fhl2-/- mice. We tested the in vivo impact of Fhl2 loss on hepatic fibrogenesis that involves TGF-β1 activation. Fhl2-/- mice developed more severe fibrosis than their WT counterparts. These results demonstrate the repressive function of FHL2 on TGF-β1 expression and contribute to the understanding of the TGF-β-mediated fibrogenic response.

journal_name

Mol Cell Biol

authors

Dahan J,Levillayer F,Xia T,Nouët Y,Werts C,Fanton d'Andon M,Adib-Conquy M,Cassard-Doulcier AM,Khanna V,Chen J,Tordjmann T,Buendia MA,Jouvion G,Wei Y

doi

10.1128/MCB.00636-16

subject

Has Abstract

pub_date

2017-05-02 00:00:00

issue

10

eissn

0270-7306

issn

1098-5549

pii

MCB.00636-16

journal_volume

37

pub_type

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