(Pre-)osteoclasts induce retraction of osteoblasts before their fusion to osteoclasts

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
S Perez-AmodioV Everts

Abstract

Precursors of osteoclasts seeded on top of a confluent layer of osteoblasts/bone lining cells induced retraction of the latter cells. The (pre)osteoclasts then migrated in the formed cell-free areas and fused to form osteoclast-like cells. Retraction of the osteoblasts/bone lining cells proved to depend on activity of matrix metalloproteinases, and TGF-beta1 prevented the retraction. It is well known that osteoblasts have a profound effect on (pre)osteoclasts in inducing the formation of bone-resorbing osteoclasts. Whether, on the other hand, (pre)osteoclasts also modulate osteoblast activity is largely unknown. Because osteoblasts/bone lining cells have to retract from the surface before resorption of bone by osteoclasts, we addressed the question of whether (pre)osteoclasts have the capacity to induce such an activity. Rabbit calvarial osteoblasts/bone lining cells or periosteal fibroblasts were cultured until confluency, after which rabbit peripheral blood mononuclear cells (PBMCs) were seeded on top of them. The co-cultures were maintained for up to 15 days in the presence or absence of the cytokines transforming growth factor (TGF)-beta1 and TNF-alpha and selective inhibitors of matrix metalloproteinases and serine protein...Continue Reading

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