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. 1982 Aug 1;94(2):379–386. doi: 10.1083/jcb.94.2.379

Parathyroid hormone receptor in intact embryonic chicken bone: characterization and cellular localization

PMCID: PMC2112888  PMID: 6286691

Abstract

The specific localization and the characterization of the parathyroid hormone (PTH) receptor in bone have been studied using 18-d embryonic chick calvariae and biologically active, electrolytically labeled [125I] bovine PTH(1-34). Binding was initiated by adding [125I]-bPTH(1- 34) to bisected calvariae at 30 degrees C. Steady state binding was achieved at 90 min at which time 10 mg drg wt of calvaria specifically bound 17% of the added [125I]bPTH(1-34). Nonspecific binding in the presence of 244 nM unlabeled bPTH(1-34) was less than 2%. Insulin, glucagon, and calcitonin (1 microgram/ml) did not compete for PTH binding sites. Half-maximal inhibition of binding was achieved at concentrations of unlabeled bPTH(1-34) or bPTH(1-84) of about 10 nM. The range of concentration (2-100 nM) over which bPTH(1-34) and bPTH(1- 84) stimulated cyclic 3'5'adenosine monophosphate (cAMP) production was similar to that which inhibited the binding of [125I]bPTH(1-34). Light microscope autoradiograms showed that grains were concentrated over cells (osteoblasts and progenitor cells) at the external surface of the calvariae and in trabeculae. In the presence of excess unlabeled PTH, labeling of control autoradiograms was reduced to near background levels. No labeling of osteocytes or osteoclasts was observed. At the electron microscopic level, grains were localized primarily over cell membranes. A quantitative analysis of grain distribution suggested that cellular internalization of PTH occurred.

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Selected References

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