Summary
In a previous study we observed that calcitonin increases β-endorphin, ACTH, and cortisol secretion. We assumed that calcitonin might have a modulatory role on the pituitary function. The present study was initiated to clarify whether this effect is due to a direct pituitary stimulation or to an indirect stimulation through CRF (corticotropin releasing factor).
Fourteen healthy subjects, aged 30–60 years were investigated. All the subjects received 100IU Salmon calcitonin Sandoz i.v. at 8a.m. (time 0). Plasma β-endorphin, ACTH and cortisol were estimated every 30min from − 30 to 120 min by specific radioimmunoassay. The same parameters were estimated a second time, at the same intervals, when cyproheptadine 8 mg (7 subjects) and 40 mg propranolol (7 subjects) were given per os at − 30 min and calcitonin i.v. at time 0. β-endorphin, ACTH and cortisol levels (Mean ±SEM) rose significantly after calcitonin (peak value at 30–90 min) from 5.2 ±0.7 to 15.1±2.6 pmol/l; from 43.0±2.7 to 70.7±4.1 pg/ml and from 10.6±1.5 to 19.6 ±2.1 μg/100 ml respectively (p< 0.0001 by analysis of variance and covariance and repeated measures). Propranolol 40 mg (per os) administered at time − 30 did not alter the response of β-endorphin, ACTH and cortisol to calcitonin (infused at time 0).
Cyproheptadine, the antiserotonergic substance that inhibits the synthesis and release of CRF completely inhibited the stimulatory effect of calcitonin.
We conclude that probably calcitonin has a modulatory role on the hypothalamo-pituitary adrenal axis and that it acts at the hypothalamic level probably by stimulating CRF secretion.
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Laurian, L., Oberman, Z., Hoerer, E. et al. Antiserotonergic inhibition of calcitonin-induced increase of β-endorphin, ACTH, and cortisol secretion. J. Neural Transmission 73, 167–176 (1988). https://doi.org/10.1007/BF01250134
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DOI: https://doi.org/10.1007/BF01250134