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• W2018049259 abstract "It has been suggested that intracellular Ca2+, in addition to cAMP, plays an important role in PTH-stimulated bone resorption. There is now strong evidence indicating that the osteoblast is the main target cell for PTH action, regulating indirectly, via cell-cell communication, osteoclastic bone resorption. In order to investigate the possible role of free cytosolic calcium in stimulated bone resorption, we studied the effects of the intact hormone (bPTH 1–84) and some of its fragments (bPTH(1–34), bPTH(3–34,) (Nle-8, Nle-18, Tyr-34) bPTH(3–34) amide) on their capacity to modify the cytosolic Ca2+ concentration in rat osteoblast-like cells. The experiments were performed using Quin-2, a fluorescent indicator of free calcium. We found an excellent correlation between the ability of PTH and PTH fragments to transiently increase cytosolic Ca2+ concentration in rat osteoblast-like cells and their ability to stimulate bone resorption in embryonic rat calvaria in vitro. On the other hand, no direct correlation was found for the cAMP and bone-resorbing responses. On the ground of these data we propose a two-receptor model for PTH action in osteoblasts, in which one receptor is coupled to the production of cAMP, whereas the other is involved in the increase of cytosolic Ca2+. Activation of both receptors by PTH (1–84) or PTH (1–34) leads to the full physiological response in osteoblasts, most probably the release of one or more factors which stimulate the activity of existing osteoclasts and others which stimulate the recruitment of additional osteoclasts." @default.
• W2018049259 created "2016-06-24" @default.
• W2018049259 creator A5000644268 @default.
• W2018049259 date "1985-08-01" @default.
• W2018049259 modified "2023-09-28" @default.
• W2018049259 title "A two-receptor model for the action of parathyroid hormone on osteoblasts: A role for intracellular free calcium and cAMP" @default.
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• W2018049259 doi "https://doi.org/10.1016/0143-4160(85)90002-8" @default.
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