Vesicular trafficking in osteoclasts
- PMID: 18768162
- DOI: 10.1016/j.semcdb.2008.08.004
Vesicular trafficking in osteoclasts
Abstract
Bone-resorbing osteoclasts are highly dependent on vesicular trafficking pathways that are regulated by Rab GTPases. In particular, polarised transport of acidic vesicles of the endocytic/lysosomal pathway is required for formation of the ruffled border, the resorptive organelle of the osteoclast. The breakdown products of resorption are then transported through the osteoclast by transcytosis, enabling their excretion. In this review, we summarise these trafficking routes, highlight the emerging evidence that the bone disease osteopetrosis results from defects in vesicular trafficking in osteoclasts, and outline the similarities between the endocytic/lysosomal compartment in osteoclasts and secretory lysosomes in other cell types.
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