CONTROL OF NEURONAL EXCITABILITY BY CORTICOSTEROID HORMONES

The rat adrenal hormone corticosterone can cross the blood-brain barrier and bind to two intracellular receptor populations in the brain - the mineralocorticoid and glucocorticoid receptor. Recent studies have revealed that the corticosteroid hormones are able to restore changes in neuronal membrane properties induced by current or neurotransmitters, probably through a genomic action. In general, mineralocorticoid receptors mediate steroid actions that enhance cellular excitability, whereas activated glucocorticoid receptors can suppress temporarily raised neuronal activity. The steroid-mediated control of excitability and the implications for information processing in the brain are reviewed in this article.