Title : The benzodiazepine agonist diazepam inhibits basal and secretagogue-stimulated prolactin release in vitro.

Pub. Date : 1984 Jan 23

PMID : 6320963






6 Functional Relationships(s)
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1 We investigated whether the inhibition of PRL secretion by the benzodiazepine receptor agonist, diazepam, occurs directly at the pituitary. Diazepam prolactin Rattus norvegicus
2 At nanomolar concentrations diazepam did not affect PRL secretion, whereas at micromolar concentrations, diazepam dose-dependently inhibited basal and secretagogue-stimulated PRL release from hemipituitary glands and from primary cultures of rat anterior pituitary cells. Diazepam prolactin Rattus norvegicus
3 Although nanomolar concentrations of diazepam alone did not affect PRL release, they did enhance the PRL inhibitory effect of muscimol, a gamma-amino butyric acid (GABA) receptor agonist. Diazepam prolactin Rattus norvegicus
4 Since these effects do not appear to occur through an inhibition of the cAMP generating system, diazepam may inhibit PRL release via a cAMP-independent pathway. Diazepam prolactin Rattus norvegicus
5 We suggest that diazepam inhibits PRL secretion either by enhancing the GABAergic inhibition of PRL release, or by inhibiting, at micromolar concentrations, a benzodiazepine-sensitive Ca2+-calmodulin dependent protein kinase. Diazepam prolactin Rattus norvegicus
6 We suggest that diazepam inhibits PRL secretion either by enhancing the GABAergic inhibition of PRL release, or by inhibiting, at micromolar concentrations, a benzodiazepine-sensitive Ca2+-calmodulin dependent protein kinase. Diazepam prolactin Rattus norvegicus