Journal
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume 289, Issue 4, Pages 845-850Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1006/bbrc.2001.6064
Keywords
endocytosis; extracellular matrix; cytoskeleton; galectin-3; integrin; caveolae
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Funding
- NCI NIH HHS [3 P30 CA68485] Funding Source: Medline
- NCRR NIH HHS [2G1RR03032] Funding Source: Medline
- NIGMS NIH HHS [GM 08037] Funding Source: Medline
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Galectin-3, a beta-galactoside binding lectin, has been demonstrated to play a key role(s) in cell to extracellular matrix interaction. The precise mechanism by which it modulates cellular adhesion is presently unclear and warrants further studies. We hereby report that galectin-3 mediates the endocytosis of beta-1 integrins in a lactose-dependent manner. Interestingly we observed that galectin-3 was also rapidly internalized by the cells via the same pathway and the internalization was completely blocked by lactose. The endocytosis process was temperature dependent and was inhibited by filipin but not chlorpromazine. The endocytosis of galectin-3 and beta-1 integrins by the cells was accompanied by rapid cell spreading due to cytoskeletal reorganization. The data suggest a novel mechanism by which galectin-3 and beta-1 integrins are internalized into breast carcinoma cells via a cavaleolae-like pathway of endocytosis. (C) 2001 Elsevier Science.
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