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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
. 1978 Aug;75(8):3871–3875. doi: 10.1073/pnas.75.8.3871

Development of parathyroid hormone- and calcitonin-activated adenylate cyclases in embryonic chicken limb and in cultured cells from embryonic chicken limb.

J E Zull, S Krug, D Abel, A I Caplan
PMCID: PMC392890  PMID: 279002

Abstract

Activation of adenylate cyclase [ATP pyrophosphate-lyase (cyclizing), EC 4.6.1.1] by parathyroid hormone (PTH) and calcitonin was measured as a function of stage of development in embryonic chicken limb buds. Responsiveness to both hormones develops in the tissue at the time when nascent bone is forming. In addition, a temporal sequence of development of hormone response was observed, with a PTH-activated adenylate cyclase appearing earlier than the calcitonin-activated enzyme. The responsiveness to the two hormones was additive, indicating the presence of two receptor populations. Undifferentiated cells obtained from limb buds prior to appearance of hormonal responsiveness were cultured and were found to develop a PTH-activated adenylate cyclase in vitro. However, a calcitonin-stimulated enzyme did not appear in such cultures. The PTH-activated enzyme was found to be similar to that present in bone in regard to its sensitivity to PTH. The enzyme did not respond to other hormones, and myoblast cultures did not develop a PTH-activated adenylate cyclase, indicating that a true bone adenylate cyclase was being measured.

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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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