HOXA9 participates in the transcriptional activation of E-selectin in endothelial cells.

Abstract:

:The homeobox gene HOXA9 has recently been shown to be an important regulator of endothelial cell (EC) differentiation and activation in addition to its role in embryonic development and hematopoiesis. In this report, we have determined that the EC-leukocyte adhesion molecule E-selectin is a key target for HOXA9. The depletion of HOXA9 protein in ECs resulted in a significant and specific decrease in tumor necrosis factor alpha (TNF-alpha)-induced E-selectin gene expression. In addition, HOXA9 specifically activated the E-selectin gene promoter in ECs. Progressive deletional analyses together with site-specific mutagenesis of the E-selectin promoter indicated that the Abd-B-like HOX DNA-binding motif, CAATTTTATTAA, located in the proximal region spanning bp -210 to -221 upstream of the transcription start site was crucial for the promoter induction by HOXA9. Both HOXA9 in EC nuclear extract and recombinant HOXA9 protein bound to this sequence in vitro. Moreover, we showed that HOXA9 binds temporally, in a TNF-alpha-dependent manner, to the region containing this Abd-B-like element in vivo. We have thus identified a novel and functionally critical cis-regulatory element for TNF-alpha-mediated transient expression of the E-selectin gene. Further, we provide evidence that HOXA9 acts as an obligate proinflammatory factor by mediating cytokine induction of E-selectin.

journal_name

Mol Cell Biol

authors

Bandyopadhyay S,Ashraf MZ,Daher P,Howe PH,DiCorleto PE

doi

10.1128/MCB.00052-07

subject

Has Abstract

pub_date

2007-06-01 00:00:00

pages

4207-16

issue

12

eissn

0270-7306

issn

1098-5549

pii

MCB.00052-07

journal_volume

27

pub_type

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