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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1987 Apr;84(7):2024–2028. doi: 10.1073/pnas.84.7.2024

Modulation of type beta transforming growth factor activity in bone cultures by osteotropic hormones.

J Pfeilschifter, G R Mundy
PMCID: PMC304576  PMID: 3494250

Abstract

Type beta transforming growth factor (TGF-beta) activity was found in conditioned medium harvested from fetal rat and neonatal mouse calvariae by using the anchorage-independent growth of normal rat kidney fibroblasts as an indicator system. Calvariae incubated with parathyroid hormone, 1,25-dihydroxyvitamin D3, and interleukin 1, all factors that stimulate bone resorption showed a concentration-dependent increase in TGF-beta activity in the culture medium. Increases in TGF-beta activity persisted undiminished for 48 hr after removal of these factors. The increases in TGF-beta activity from the resorbing bone cultures were relatively greater than the increases in bone resorption. Calcitonin inhibition of bone resorption correlated with a decrease in TGF-beta activity. Thus, agents that modulate bone resorption also affect TGF-beta activity in the bone culture medium. Changes in local concentrations of TGF-beta activity by osteotropic hormones may be important in the regulation of normal bone remodeling.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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