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Role of Flightless-I (Drosophila) homolog in the transcription activation of type I collagen gene mediated by transforming growth factor beta.

Abstract：

:Flightless-I (Drosophila) homolog (FLII) is a nuclear receptor coactivator that is known to interact with other transcriptional regulators such as the SWI/SNF complex, an ATP-dependent chromatin-remodeling complex, at the promoter or enhancer region of estrogen receptor (ER)-α target genes. However, little is known about the role of FLII during transcription initiation in the transforming growth factor beta (TGFβ)/SMAD-dependent signaling pathway. Here, we demonstrate that FLII functions as a coactivator in the expression of type I collagen gene induced by TGFβ in A549 cells. FLII activates the reporter gene driven by COL1A2 promoter in a dose-dependent manner. Co-expression of GRIP1, CARM1, or p300 did not show any synergistic activation of transcription. Furthermore, the level of COL1A2 expression correlated with the endogenous level of FLII mRNA level. Depletion of FLII resulted in a reduction of TGFβ-induced expression of COL1A2 gene. In contrast, over-expression of FLII caused an increase in the endogenous expression of COL1A2. We also showed that FLII is associated with Brahma-related gene 1 (BRG1) as well as SMAD in A549 cells. Notably, the recruitment of BRG1 to the COL1A2 promoter region was decreased in FLII-depleted A549 cells, suggesting that FLII is required for TGFβ-induced chromatin remodeling, which is carried out by the SWI/SNF complex. Furthermore, formaldehyde-assisted isolation of regulatory elements (FAIRE)-quantitative polymerase chain reaction (qPCR) experiments revealed that depletion of FLII caused a reduction in chromatin accessibility at the COL1A2 promoter. These results suggest that FLII plays a critical role in TGFβ/SMAD-mediated transcription of the COL1A2 gene through its role in recruiting the SWI/SNF complex to facilitate chromatin accessibility.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Lim MS,Jeong KW

doi

10.1016/j.bbrc.2014.10.100

subject

Has Abstract

pub_date

2014-11-21 00:00:00

pages

393-8

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(14)01910-X

journal_volume

454

pub_type

杂志文章

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