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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Skeletal contribution of cyclic adenosine monophosphate in response to parathyroid hormone and calcitonin in vivo in the rat.

Cyclic adenosine monophosphate (cAMP) is thought to be a second messenger for the actions of both parathyroid hormone (PTH) and calcitonin (CT). We examined the release of cAMP from rat bone in vivo after administration of synthetic rat PTH-(1-34) (rPTH), synthetic human PTH-(1-34) (hPTH), or synthetic human CT (hCT). Blood from the venous effluent of the femoral bone of rats (bone blood) was drawn at 5 and 10 minutes after the administration of hormones. The cAMP content of the bone blood was then compared to the cAMP content of arterial blood. In both kidney-clamped and non-kidney-clamped rats, hCT led to a significantly greater concentration of cAMP in the bone blood than in the arterial blood. We interpret this to be due to bone production and release of cAMP. Neither hPTH nor rPTH produced a significantly greater amount of cAMP in the bone blood than in arterial blood. These data do not preclude the possibility that there was a production of cAMP within the bone tissue itself after PTH but suggest that there was no release of cAMP from the bone into the bone blood.[1]


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