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Abstract
Concanavalin A (Con A), a plant lectin that recognizes cell-surface glycoproteins, up-regulates osteoclastic bone-resorbing activity of cultured isolated rabbit pure osteoclasts as well as unfractionated bone cells. The effect of Con A was blocked by α-methyl mannopyranoside. Several Con A-binding proteins were detected in the plasma membranes from osteoclasts. Furthermore, Con A increased the levels of transcripts of cathepsin K/OC-2, one of the proteases responsible for osteoclastic bone-resorbing activity. These results indicate that Con A directly enhances the function of osteoclasts by the association with surface glycoproteins of osteoclasts.
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