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. 1970 Feb;65(2):446–453. doi: 10.1073/pnas.65.2.446

Effect of Thyrocalcitonin on Adenosine 3′:5′-Cyclic Phosphate Formation by Rat Kidney and Bone

Ferid Murad 1, H Bryan Brewer Jr 1, Martha Vaughan 1
PMCID: PMC282923  PMID: 4313199

Abstract

Thyrocalcitonin (TCT) increased the rate of accumulation of adenosine 3′:5′-cyclic phosphate (cyclic AMP) when added to incubations containing washed particles from whole rat kidney, adenosine triphosphate (ATP), MgSO4, and caffeine. The maximum stimulatory effect of TCT, 44 ± 6.7 per cent, was always less than the 150 to 250 per cent increase produced by parathyroid hormone (PTH). The effect of both hormones together was no greater than that of PTH alone when each was present at a maximally effective concentration. Since neither TCT nor PTH altered the rate of degradation of cyclic AMP by the kidney preparation, it may be inferred that their effects on cyclic AMP accumulation are the result of increased formation of cyclic AMP. Adenyl cyclase activity in homogenates of renal cortex was stimulated to a greater extent by TCT and PTH than was that of medulla, whereas, as reported earlier, the effect of vasopressin was much larger with homogenates of medulla. The accumulation of cyclic AMP in incubations of rat kidney cortex slices was increased 20 to 60 per cent by TCT and 50 to 140 per cent by PTH. The accumulation of cyclic AMP in incubations of rat calvaria was increased about threefold with TCT and nine to tenfold with PTH, while reduced and alkylated TCT had less than 10 per cent of the activity of TCT. These observations are consistent with the view that the physiological effects of TCT and PTH in kidney and bone are secondary to the enhanced formation of cyclic AMP.

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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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