Document Detail

GM3 synthase overexpression results in reduced cell motility and in caveolin-1 upregulation in human ovarian carcinoma cells.
MedLine Citation:
PMID:  19759399     Owner:  NLM     Status:  In-Process    
In this paper, we describe the effects of the expression of GM3 synthase at high levels in human ovarian carcinoma cells. Overexpression of GM3 synthase in A2780 cells consistently resulted in elevated ganglioside (GM3, GM2 and GD1a) levels. GM3 synthase overexpressing cells had a growth rate similar to wild-type cells, but showed a strongly reduced in vitro cell motility accompanied by reduced levels of the epithelial-mesenchymal transition marker alpha smooth muscle actin. A similar reduction in cell motility was observed upon treatment with exogenous GM3, GM2, and GM1, but not with GD1a. A photolabeling experiment using radioactive and photoactivable GM3 highlighted several proteins directly interacting with GM3. Among those, caveolin-1 was identified as a GM3-interacting protein in GM3 synthase overexpressing cells. Remarkably, caveolin-1 was markedly upregulated in GM3 synthase overexpressing cells. In addition, the motility of low GM3 synthase expressing cells was also reduced in the presence of a Src kinase inhibitor; on the other hand, higher levels of the inactive form of c-Src were detected in GM3 synthase overexpressing cells, associated with a ganglioside- and caveolin-rich detergent insoluble fraction.
Alessandro Prinetti; Massimo Aureli; Giuditta Illuzzi; Simona Prioni; Valentina Nocco; Federica Scandroglio; Nicoletta Gagliano; Giovanni Tredici; Virginia Rodriguez-Menendez; Vanna Chigorno; Sandro Sonnino
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-09-16
Journal Detail:
Title:  Glycobiology     Volume:  20     ISSN:  1460-2423     ISO Abbreviation:  Glycobiology     Publication Date:  2010 Jan 
Date Detail:
Created Date:  2009-11-26     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9104124     Medline TA:  Glycobiology     Country:  England    
Other Details:
Languages:  eng     Pagination:  62-77     Citation Subset:  IM    
Department of Medical Chemistry, Biochemistry and Biotechnology, Center of Excellence on Neurodegenerative Diseases, Biochemistry and Biotechnology, University of Milan, Italy.
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