All-trans- and 9-cis-retinoic acids activate the human cyclooxynase-2 gene: a role for DR1 as RARE or RXRE.

Abstract:

:The human COX-2 promoter contains a direct repeat 1 (DR1) which was shown to confer responsiveness to PPARs. We found that in AN(3)CA and F9 cells, this hCOX-2 DR1 mediates responsiveness to all-trans-retinoic acid (tRA) or 9-cis-retinoic acid (9cRA), but this effect was suppressed by PPARδ. Truncated PPARδ lacking the activation domain AF2 cannot suppress RA-induced activation of the hCOX-2 gene via DR1, suggesting that cofactor recruitment by AF2 is required for the suppression by PPARδ. Gel shift assay showed that PPAR/RXR, RARβ/RXR, and RXR/RXR, bind to hCOX-2 DR1, revealing the promiscuity of this DR1. Particularly, RXR homodimer was able to bind to this DR1 only in the presence of 9cRA. Our results established that tRA and 9cRA are potent inducers of hCOX-2 and that the hCOX-2 DR1 could either serve as RARE or RXRE depending on cellular contexts.

journal_name

Mol Biol Rep

authors

Han K,Moon I,Lim HJ

doi

10.1007/s11033-010-0173-4

subject

Has Abstract

pub_date

2011-02-01 00:00:00

pages

833-40

issue

2

eissn

0301-4851

issn

1573-4978

journal_volume

38

pub_type

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