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Galectin-3 Inhibits Cancer Metastasis by Negatively Regulating Integrin β3 Expression.

Am. J. Pathol.2019 Apr;189(4):900-910. Epub 2019 Jan 14
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摘要


Galectin-3 (Gal-3; gene LGALS3) is a member of the β-galactose-binding lectin family. Previous studies showed that Gal-3 is expressed in several tissues across species and functions as a regulator of cell proliferation, apoptosis, adhesion, and migration, thus affecting many aspects of events, such as angiogenesis and tumorigenesis. Although several reports have suggested that the level of Gal-3 expression correlates positively with tumor progression, herein we show that highly metastatic mouse melanoma B16/BL6 cells express less Gal-3 than B16 cells with a lower metastatic potential. It was found that overexpression of Gal-3 in melanoma cells in fact suppresses metastasis. In contrast, knocking out Gal-3 expression in cancer cells promoted cell aggregation mediated through interactions with platelets and fibrinogen in vitro and increased the number of metastatic foci in vivo. Thus, reduced Gal-3 expression results in the up-regulation of β3 integrin expression, and this contributes to metastatic potential. These findings indicate that changes of Gal-3 expression in cancer cells during tumor progression influence the characteristics of metastatic cells.

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