PMID: 8609597Sep 1, 1995Paper

Cell protective role of melatonin in the brain

Journal of Pineal Research
D Acuña-CastroviejoR Montes

Abstract

In recent years an increasing amount of data has been published involving melatonin in the control of brain function. The pineal gland exerts a depressive influence on CNS excitability. This activity is linked to melatonin, since pharmacological doses of the hormone prevent seizures in several animal models. In addition, melatonin also has analgesic properties in these species. However, the sites and mechanism of melatonin action are not known. A role for the pineal gland and its hormone melatonin as a homeostatic system controlling brain excitability has been proposed, and GABA-containing neurons may be involved in some central action of melatonin. There is evidence supporting a role of melatonin in the regulation of the GABA-benzodiazepine receptor complex, and it appears that melatonin potentiates this inhibitory neurotransmitter system in brain. Melatonin does not bind to GABA or benzodiazepine binding sites themselves, because in vitro binding data showed that melatonin is a weak competitor of benzodiazepine binding in brain membranes at concentrations greater than 10(-5) M. The effect of melatonin on brain activity also involves the participation of corticotropic and opioid peptides, and the existence of an opioid-antiopi...Continue Reading

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