Abstract:
:Regulation of MUC1 expression and removal is a salient feature of embryo implantation, bacterial clearance, and tumor progression. In some species, embryo implantation is accompanied by a transcriptional decline in uterine epithelial expression of MUC1. In other species, MUC1 is locally removed at blastocyst attachment sites, suggesting a proteolytic activity. Previously, we demonstrated that MUC1 is proteolytically released from the surface of a human uterine epithelial cell line, HES, and identified TNFalpha converting enzyme/a disintegrin and metalloprotease 17 as a constitutive and phorbol ester-stimulated MUC1 sheddase. The aims of the current study were to test the ability of soluble factors elevated during the periimplantation interval in vivo to stimulate ectodomain shedding of MUC1 from HES uterine epithelial cells and to characterize the nature of this proteolytic activity(ies). We identified TNFalpha as a prospective endogenous stimulus of MUC1 ectodomain release and of MUC1 and TNFalpha converting enzyme/a disintegrin and metalloprotease 17 expression. Moreover, we established that TNFalpha-stimulated MUC1 shedding occurs independently of increased de novo protein synthesis and demonstrated that the TNFalpha-induced increase in MUC1 gene expression is mediated through the kappaB site in the MUC1 promoter. Finally, we determined that the TNFalpha-sensitive MUC1 sheddase is inhibited by the metalloprotease inhibitor, TNFalpha protease inhibitor (TAPI), and the endogenous tissue inhibitor of metalloprotease-3. Collectively, these studies provide the initial in vitro characterization of a putative physiological stimulus of MUC1 ectodomain release and establish the nature of the metalloproteolytic activity(ies) involved.
journal_name
Endocrinologyjournal_title
Endocrinologyauthors
Thathiah A,Brayman M,Dharmaraj N,Julian JJ,Lagow EL,Carson DDdoi
10.1210/en.2004-0399subject
Has Abstractpub_date
2004-09-01 00:00:00pages
4192-203issue
9eissn
0013-7227issn
1945-7170pii
en.2004-0399journal_volume
145pub_type
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