Abstract
Anatomical and biochemical studies have identified a hypothalamic tubero-infundibular GABAergic system, which plays a functional role on anterior pituitary hormone secretion. Experimental and clinical evidence support the presence of a dual component in the action of GABA; one mediated via the central nervous system and the other exerted directly at the anterior pituitary level. The two sites of action may be responsible for the excitatory and inhibitory effects of GABA on pituitary hormone and especially prolactin secretion. The future characterization of this system will provide a better understanding of the involvement of GABA in the physiology of anterior pituitary hormone secretion and will contribute to the developent of new pharmacological agents for the therapy of neuroendocrine disorders.
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