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Immunohistochemical heterogeneity of nerve cells in the human adrenal gland with special reference to substance P

M Colombo-Benkmann, L Klimaschewski and C Heym

Department of Surgery, University of Heidelberg, Germany.

Neurons in the human adrenal medulla, stained by the NADH-diaphorase reaction, were counted and their neurochemical markers were investigated by double labeling immunofluorescence with special reference to substance P. The findings indicate a significant participation of intramedullary nerve cell bodies in human adrenal innervation with 40.4 neurons/mm3 adrenal medulla. Substance P- immunoreactive neurons, which made up approximately 20% of all neurons, exhibited heterogeneity by co-localization of immunoreactivities for dynorphin, for cholecystokinin, and for neurofilament triplet. Substance-P-immunolabeled neurons were always nonreactive for calcitonin gene-related peptide, for vasoactive intestinal polypeptide, or for tyrosine hydroxylase, the rate-limiting enzyme of catecholamine synthesis. These chemical phenotypes of intramedullary neurons reveal immunohistochemical similarities with postganglionic neurons in parasympathetic ganglia or with enteric neurons, suggesting a hitherto unrecognized functional significance of the intrinsic nervous system in the human adrenal gland.

Volume 44, Issue 4, pp. 369-375, 04/01/1996
Copyright © 1996 by The Histochemical Society


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