Anatomical Relationships of Dopaminergic and GABAergic Systems with the GnRH-systems in the Septo-hypothalamic Area. Immunohistochemical Studies

Overview

Journal Exp Brain Res

Specialty Neurology

Date 1983 Jan 1

PMID 6139290

Citations 12

Authors

L Jennes

W E Stumpf

M L Tappaz

Affiliations

Soon will be listed here.

Abstract

Immunohistochemical double staining for gonadotropin releasing hormone (GnRH) and tyrosine hydroxylase (TH) or glutamic acid decarboxylase (GAD) reveals in the septo-preoptic-diagonal band complex of the rat brain close spatial associations between GnRH-immunoreactive perikarya and TH and GAD immunoreactive fibers. In the organum vasculosum laminae terminalis, no close spatial relationships could be observed between TH- or GAD-positive fibers and the GnRH-containing system. In contrast, in the median eminence substantial overlap exists in the distribution of GnRH with TH and GAD containing nerve fibers. This overlap is most intense for TH throughout the lateral palisade zone, while for GAD it is more restricted to the outermost portion of the external palisade zone. The results suggest that dopamine and GABA influence GnRH secretion via axosomatic contacts in the septo-preoptic-diagonal band complex, as well as via axo-axonic interactions in the median eminence, while no such interactions seem to exist in the organum vasculosum laminae terminalis. Since dopaminergic cell bodies in the ventral hypothalamus are closely apposed by GnRH and GAD containing fibers, the existence of feedback circuits among GnRH, dopamine and GABA systems is proposed.

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