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Neuroendocrine effects of quipazine in man in health state or with neurological disorders

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Summary

The endocrinological actions of quipazine, a direct serotonin receptor agonist, were investigated in both normal subjects (NS) and individuals with neurological disorders,i.e., Huntington's disease (HD), myoclonic epilepsy (ME) and cluster headache (CH). In both normal subjects and neurologic patients inconsistent and variable changes in the secretion of anterior pituitary hormones were observed. In fact, oral administration of 50 mg of quipazine elicited a rise in plasma GH in only 9/23 subjects investigated (3 NS, 2 HD, 1 ME, 3 CH), decreased GH in 4 subjects (1 NS, 2 HD, 1 CH) and left unmodified plasma GH in the remaining 10 subjects. Only 7/23 subjects showed a positive PRL response to quipazine (2 NS, 1 HD, 1 ME, 3 CH), in one subject (CH) PRL was inhibited while the drug was ineffective in the remaining 15 subjects. For gonadotropins, 5/21 subjects (2 NS, 1 HD, 2 CH) had a positive LH response and 3/20 subjects (1 NS, 1 ME, 1 CH) had a positive FSH response. In one subject (HD) there was inhibition of baseline LH levels and no effects were present in the remaining individuals. No changes in basal TSH levels were present in the 6 subjects investigated (4 NS, 2 ME). Quipazine was instead competent to increase plasma cortisol levels in 6/8 normal subjects. Pharmacodynamic, mainly gastrointestinal, effects of the drug were present in about 50% of the subjects but were not or only poorly correlated with the endocrine responses. Collectively, based on the neuropharmacologic profile of the drug, and in contrast to many animal data, these findings do not support a major role for the serotoninergic system on basal anterior pituitary hormone secretion in man, possibly with the exception of the ACTH-cortisol secretion.

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Supported by Hereditary Disease Foundation, Beverly Hills, California, U.S.A.

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Parati, E.A., Zanardi, P., Cocchi, D. et al. Neuroendocrine effects of quipazine in man in health state or with neurological disorders. J. Neural Transmission 47, 273–297 (1980). https://doi.org/10.1007/BF01247322

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