Expression of Lamp-1 and Lamp-2 and their interactions with galectin-3 in human tumor cells

Victoria Sarafian, Michel Jadot, Jean Michel Foidart, Jean-Jacques Letesson, Frédéric Van den Brule, Vincent Castrunovo, Robert Wattiaux, Simone Wattiaux-De Coninck

Résultats de recherche: Contribution à un journal/une revueArticleRevue par des pairs


Lysosomal-membrane-associated glycoproteins (Lamps) 1 and 2 are rarely found on the plasma membranes of normal cells. There is evidence suggesting an increase in their cell-surface expression in tumor cells, with some data indicating that the adhesion of some cancer cells to the extracellular matrix is partly mediated by interactions between Lamps and E-selectin and between Lamps and galectins (endogenous-galactoside-binding lectins). The present study examined the expression of Lamp-1 and Lamp-2 and their interactions with galectin-3 in different human tumor cell lines. Indirect immunofluorescence staining revealed accumulation of Lamp molecules at the edges of A2058 human metastasizing melanoma cells suggesting that these glycoproteins could participate in cell adhesion. Flow cytometry showed the presence of cell-surface Lamps in A2058, HT1080 (human fibrosarcoma) and CaCo-2 (human colon-adenocarcinoma) cells. Treatment with 2 mM sodium butyrate for 24 and 48 hr resulted in a significant increase in Lamps surface expression. A strong binding of A2058 to recombinant galectin-3 was detected by FACS. The application of 2 and 5 mM butyrate for the same incubation period enhanced galectin-3 binding to Lamps-expressing cells. Our results support the idea that Lamps may be considered a new family of adhesive glycoproteins participating in the complex process of tumor invasion and metastasis.

langue originaleAnglais
Pages (de - à)105-111
Nombre de pages7
journalInternational Journal of Cancer
Numéro de publication1
Les DOIs
Etat de la publicationPublié - 5 janv. 1998

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