The effect of calcium-regulating hormones and prostaglandins on bone resorption by osteoclasts disaggregated from neonatal rabbit bones.

Abstract:

:It has previously only been possible to assess osteoclastic bone resorption in intact bone, where other cell types may modify or mediate osteoclastic responses to environmental agents. We have recently developed techniques which enable us to measure bone resorption by osteoclasts extracted from bone and have used these techniques to assess the effects of prostaglandins (PGs) and calcium-regulating hormones on bone resorption by these cells. Osteoclasts were mechanically disaggregated from neonatal rabbit long bones and cultured on slices of devitalized cortical bone for 8 or 24 h. After this time, osteoclasts were associated with the appearance in the scanning electron microscope of characteristic resorption pits, the volume of which was calculated by computer-assisted morphometric and stereophotogrammetric techniques after removal of cells. Salmon calcitonin inhibited osteoclastic bone resorption at concentrations of 1 pg/ml and above, while PTH and 1,25-dihydroxyvitamin D3 were without significant effect. This suggests that the latter hormones do not increase bone resorption in intact bone through a direct effect on osteoclasts. PGI2, PGE1, and PGE2, all of which are known to stimulate resorption when added to intact bone, paradoxically reduced resorption in our cultures. It appears likely that PGs act as direct inhibitors of osteoclastic bone resorption but have an additional effect on other cells in bone, which are induced by PGs to cause osteoclastic stimulation.

journal_name

Endocrinology

journal_title

Endocrinology

authors

Chambers TJ,McSheehy PM,Thomson BM,Fuller K

doi

10.1210/endo-116-1-234

subject

Has Abstract

pub_date

1985-01-01 00:00:00

pages

234-9

issue

1

eissn

0013-7227

issn

1945-7170

journal_volume

116

pub_type

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