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RUNX3 regulates the activity of the CD11a and CD49d integrin gene promoters.

Abstract：

:The leukocyte integrins CD11a/CD18 (LFA-1, alphaLbeta2) and CD49d (VLA-4, alpha4beta1, alpha4beta7) mediate leukocyte transendothelial migration during immune and inflammatory responses and provides co-stimulatory signals for the activation of T lymphocytes. Our previous studies demonstrate that the CD11a gene promoter directs CD11a/CD18 integrin expression, and it depends on two overlapping sequences within the MS7 element, RUNX-110 and CEBP-100, which are recognized by RUNX and C/EBP transcription factor families, respectively. Recognition of MS7 differs in lymphoid (RUNX) and myeloid (C/EBP and RUNX) cells and its in vivo occupancy is regulated in a competitive and differentiation-dependent manner. The functional relevance of these elements are illustrated by the fact that RUNX3 overexpression leads to enhanced CD11a/CD18 levels, whereas RUNX1-ETO-expressing cells exhibit a weak/absent CD11a/CD18 integrin cell surface expression. We now provide evidence that RUNX3 also transactivates the CD49d gene promoter, and that the increased expression of CD49d mRNA and CD49d integrins on mature monocyte-derived dendritic cells correlates with an up-regulation of RUNX3 mRNA. The regulation of CD49d and CD11a integrins by RUNX3 could potentially contribute to the enhancement of transendothelial migration, antigen presentation and T cell stimulatory capabilities of mature dendritic cells.

journal_name

Immunobiology

journal_title

Immunobiology

authors

Domínguez-Soto A,Relloso M,Vega MA,Corbí AL,Puig-Kröger A

doi

10.1016/j.imbio.2005.05.008

subject

Has Abstract

pub_date

2005-01-01 00:00:00

pages

133-9

issue

2-4

eissn

0171-2985

issn

1878-3279

pii

S0171-2985(05)00080-X

journal_volume

210

pub_type

杂志文章

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