Extracellular ADP is a powerful osteolytic agent: evidence for signaling through the P2Y(1) receptor on bone cells

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
A HoebertzT R Arnett

Abstract

There is increasing evidence that extracellular nucleotides act on bone cells via P2 receptors. This study investigated the action of ADP and 2-methylthioADP, a potent ADP analog with selectivity for the P2Y(1) receptor, on osteoclasts, the bone-resorbing multinuclear cells. Using three different assays, we show that ADP and 2-methylthioADP at nanomolar to submicromolar levels caused up to fourfold to sixfold increases in osteoclastic bone resorption. On mature rat osteoclasts, cultured for 1 day on polished dentine disks, peak effects on resorption pit formation were observed between 20 nM and 2 microM of ADP. The same concentrations of ADP also stimulated osteoclast and resorption pit formation in 10-day mouse marrow cultures on dentine disks. In 3-day explant cultures of mouse calvarial bones, the stimulatory effect of ADP on osteoclast-mediated Ca(2+) release was greatest at 5-50 microM and equivalent to the maximal effects of prostaglandin E(2). The ADP effects were blocked in a nontoxic manner by MRS 2179, a P2Y(1) receptor antagonist. Using in situ hybridization and immunocytochemistry, we found evidence for P2Y(1) receptor expression on both osteoclasts and osteoblasts; thus, ADP could exert its actions both directly on...Continue Reading

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