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American Journal of Pathology, Vol 148, 25-30, Copyright © 1996 by American Society for Investigative Pathology
REGULAR ARTICLES |
KN Konstantinov, BA Robbins and FT Liu
Department of Molecular and Experimental Medicine, Scripps Research Institute, La Jolla, CA 92037, USA.
Galectin-3 is a member of a newly named family of beta-galactoside- binding animal lectins, which has been described with a number of possible important biological functions, including the regulation of cell growth and association with tumor transformation. This protein has a wide tissue distribution but is notably not expressed by normal lymphocytes. We have previously shown that galectin-3 is markedly up- regulated in HTLV-I-infected T cells, most likely mediated by the viral transactivating protein Tax. In this study, we surveyed various lymphomas by immunohistochemistry and found the expression of galectin- 3 in all of the 8 cases of Ki-1+ anaplastic large-cell lymphoma (ALCL). Immunoreactivity for galectin-3 was found in a majority of the neoplastic cells in the ALCLs studied. In contrast, only 2 of the 35 cases of other types of lymphoma, including various Hodgkin's and non- Hodgkin's lymphomas, were positive. Unlike the cases of ALCL, immunoreactivity for galectin-3 in these 3 cases was found only sporadically in a small number of neoplastic cells. Thus, galectin-3 may prove to be a useful marker for ALCL and its expression in neoplastic cells in ALCL may contribute to the biological behavior of this specific type of lymphoma.
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