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Galectins are a family of beta-galactoside binding molecules involved in cell--extracellular matrix adhesion processes. Specifically, Galectin-3 (Gal-3), one of the members of this family of molecules plays a role in cell adhesion processes as well as in cell survival or apoptosis. Gal-3 was also hypothesized to represent a useful tool in tumor characterization, for example, in thyroid tumors. We report herein the results obtained by evaluating Gal-3 expression of colon cells from human adenomas and adenocarcinomas with two different methodologies: immunohistochemistry and flow cytometry of living dispersed cells. We found that (1) the expression of Gal-3 was significantly increased on the surface of cells from adenomas with respect to normal mucosa from the same patient; (2) Gal-3 ligand, 90k molecule, was increased in the blood plasma from patients with both adenomatous and adenocarcinomatous lesions; and (3) Gal-3 overexpression was not related with the presence of K-ras mutation. Altogether these results clearly indicate that the evaluation of Gal-3 expression (and of its ligand, 90k) can be of interest in the characterization of nonmalignant and malignant colon cancers.

Cell surface overexpression of galectin-3 and the presence of its ligand 90k in the blood plasma as determinants in colon neoplastic lesions