The anti-bone-resorptive agent calcitonin also acts in vitro to directly increase bone formation and bone cell proliferation

Endocrinology
J FarleyD J Baylink

Abstract

The studies summarized in this report were intended to determine whether salmon calcitonin had direct effects on bone formation indices in vitro. The results of these investigations demonstrate acute effects of calcitonin on skeletal tissues derived from embryonic chickens to increase calvarial cell proliferation ([3H]thymidine incorporation into DNA) and bone matrix synthesis ([3H]proline incorporation into collagen, as [3H]hydroxyproline) in intact calvaria and tibiae. The effects of calcitonin on [3H]thymidine incorporation were significant at 1 mU/ml (0.08 nM; P less than 0.05), additive with respect to the action(s) of F (calcitonin increased the maximum effect of F, and F increased the effect of low dose calcitonin; P less than 0.01 for each), associated with an increase in total cell protein (r = 0.82; P less than 0.02), and inversely dependent on osteoblastic differentiation (r = -0.96; P less than 0.005). The effects of calcitonin to increase bone matrix synthesis ([3H]hydroxyproline incorporation, 139% and 155% of untreated control values for tibiae and calvaria, respectively; P less than 0.005 for each) were maximal at approximately 5 mU/ml (0.4 nM) and associated with a proportional increase in alkaline phosphatase ...Continue Reading

Citations

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