Journal Article

The role of N-acetylglucosaminyltransferase III and V in the post-transcriptional modifications of E-cadherin

Salomé S. Pinho, Celso A. Reis, Joana Paredes, Ana Maria Magalhães, António Carlos Ferreira, Joana Figueiredo, Wen Xiaogang, Fátima Carneiro, Fátima Gärtner and Raquel Seruca

in Human Molecular Genetics

Volume 18, issue 14, pages 2599-2608
Published in print July 2009 | ISSN: 0964-6906
Published online April 2009 | e-ISSN: 1460-2083 | DOI: http://dx.doi.org/10.1093/hmg/ddp194
The role of N-acetylglucosaminyltransferase III and V in the post-transcriptional modifications of E-cadherin

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It has long been recognized that E-cadherin dysfunction is a major cause of epithelial cell invasion. However, very little is known about the post-transcriptional modifications of E-cadherin and its role in E-cadherin mediated tumor progression. N-acetylglucosaminyltransferase III (GnT-III) catalyzes the formation of a bisecting GlcNAc structure in N-glycans, and has been pointed as a metastasis suppressor. N-acetylglucosaminyltransferase V (GnT-V) catalyzes the addition of β1,6 GlcNAc branching of N-glycans, and has been associated to increase metastasis. The regulatory mechanism between E-cadherin expression and the remodeling of its oligosaccharides structures by GnT-III and GnT-V were explored in this study. We have demonstrated that wild-type E-cadherin regulates MGAT3 gene transcription resulting in increased GnT-III expression. We also showed that GnT-III and GnT-V competitively modified E-cadherin N-glycans. The GnT-III knockdown cells revealed a membrane de-localization of E-cadherin leading to its cytoplasmic accumulation. Further, the GnT-III knockdown cells also caused modifications of E-cadherin N-glycans catalyzed by GnT-III and GnT-V. Altogether our results have clarified the existence of a bidirectional crosstalk between E-cadherin and GnT-III/GnT-V that was, for the first time, reproduced in an in vivo model. This study opens new insights into the post-transcriptional modifications of E-cadherin in its biological function, in a tumor context.

Journal Article.  4974 words.  Illustrated.

Subjects: Genetics and Genomics

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