N-acetylglucosaminyltransferase V regulates extravillous trophoblast invasion through glycosylation of alpha5beta1 integrin.

Abstract:

:For successful human placentation, invasion of trophoblast cells into the uterus and its associated vasculature is essential, and the regulation of this process is controlled by many factors at the fetal-maternal interface. N-acetylglucosaminyltransferase V (GnT-V) is a key enzyme that catalyzes beta1, 6-N-acetylglucosamine (beta1-6GlcNAc) branching on asparagine-linked oligosaccharides of cell proteins. GnT-V and its product, beta1-6GlcNAc, are known to regulate cellular transformation and correlate with the metastatic potential of various cancer cells. The aim of the present study was to determine whether extravillous trophoblast (EVT) expressed this molecule and examine the role of GnT-V in the regulation of human trophoblast invasion. Immunohistochemistry showed that GnT-V was strongly expressed within the cytoplasm of EVT in the anchoring villi; this expression was down-regulated in EVTs invading the decidua. Suppression of beta1-6GlcNAc glycosylation by swainsonine enhanced the migratory potential and invasive capability of both primary EVTs and the EVT cell line, HTR-8/SVneo. Down-regulation of GnT-V expression by small interfering RNA in the choriocarcinoma cell line Jar consistently enhanced the migration and invasive capacity of these cells and elevated cellular adhesion to extracellular matrix proteins, such as fibronectin and collagen type I/IV. The extent of beta1-6 branching of alpha5beta1 integrin was significantly reduced in small interfering GnT-V-transfected Jar cells compared with mock transfectants, although the expression of alpha1, alpha5, alpha6, and beta1 integrin on the cell surface was not changed. These results suggest that GnT-V is expressed in human EVT and is involved in regulating trophoblast invasion through modifications of the oligosaccharide chains of alpha5beta1 integrin.

journal_name

Endocrinology

journal_title

Endocrinology

authors

Yamamoto E,Ino K,Miyoshi E,Inamori K,Abe A,Sumigama S,Iwase A,Kajiyama H,Shibata K,Nawa A,Kikkawa F

doi

10.1210/en.2008-1005

subject

Has Abstract

pub_date

2009-02-01 00:00:00

pages

990-9

issue

2

eissn

0013-7227

issn

1945-7170

pii

en.2008-1005

journal_volume

150

pub_type

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