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Functional role of NF-IL6beta and its sumoylation and acetylation modifications in promoter activation of cyclooxygenase 2 gene.

Abstract：

:NF-IL6beta regulates gene expression and plays function roles in many tissues. The EGF-regulated cyclooxygenase-2 (cox-2) expression is mediated through p38(MAPK) signaling pathway and positively correlates with NF-IL6beta expression in A431 cells. NF-IL6beta coordinated with c-Jun on cox-2 transcriptional activation by reporter and small interfering RNA assays. NF-IL6beta could directly bind to CCAAT/enhancer-binding protein (C/EBP) and cyclic AMP-response element (CRE) sites of the cox-2 promoter by in vitro-DNA binding assay. The C/EBP site was important for basal and, to a lesser extent, for EGF-regulated cox-2 transcription, while the CRE site was a more specific response to EGF inducibility of cox-2 gene. SUMO1 expression attenuated EGF- and NF-IL6beta-induced cox-2 promoter activities. NF-IL6beta was found to be sumoylated by in vivo- and in vitro-sumoylation assays, and the SUMO1-NF-IL6beta (suNF-IL6beta) lost its ability to interact with p300 in in vitro-binding assay. NF-IL6beta was also acetylated by p300, and acetylation of NF-IL6beta enhanced the cox-2 promoter activity stimulated by NF-IL6beta itself. In vivo-DNA binding assay demonstrated that EGF stimulated the recruitment of p300 and NF-IL6beta to the cox-2 promoter, yet promoted the dissociation of SUMO1-modificated proteins from the promoter. These results indicated that NF-IL6beta plays a pivotal role in the regulation of basal and EGF-induced cox-2 transcription.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Wang JM,Ko CY,Chen LC,Wang WL,Chang WC

doi

10.1093/nar/gkj422

keywords:

subject

Has Abstract

pub_date

2006-01-05 00:00:00

pages

217-31

issue

1

eissn

0305-1048

issn

1362-4962

pii

34/1/217

journal_volume

34

pub_type

杂志文章

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