Localization of enkephalin- and neurotensin-like immunoreactivities in cat adrenal medulla |
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Authors: | M Pelto-Huikko T Salminen A Hervonen |
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Institution: | (1) Department of Biomedical Sciences, University of Tampere, SF-33101 Tampere, Finland;(2) Department of Public Health, University of Tampere, SF-33101 Tampere, Finland |
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Abstract: | Summary Enkephalin (ENK)- and neurotensin (NT)-immunoreactivities (IR) were localized in cat adrenal medulla using immunocytochemistry. ENK was localized mainly in adrenaline cells, 70%–80% of which were heavily labelled. About 5%–10% of the noradrenaline cells were ENK-immunoreactive (IR). A dense network of ENK-IR nerves was localized among adrenaline cells. NT was localized only in the noradrenaline cells, 60%–70% of which were immunoreactive. NT- and ENK-IR were localized in separate noradrenaline cells. A dense network of NT-IR nerves was restricted among noradrenaline cells.The present findings confirm that ENK- and NT-like peptides are localized in separate adrenal medullary cells and demonstrate that also the preganglionic nerves are divided in subpopulations according to their neuropeptide content. These nerves have a selective localization among adrenaline and noradrenaline cells and may have physiological significance in the control of secretion of catecholamines and neuropeptides from adrenal medulla. |
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