Summary
The coexistence of met5- and leu5-enkephalinlike immunoreactivities with catecholamines in the rat adrenal medulla was studied with combined fluorescence microscopy and immunocytochemistry. Both met5- and leu5-enkephalin-like immunoreactivities were localized in few heavily stained adrenaline cells and in a population of nerves innervating adrenaline cells and as well as ganglion cells among the adrenaline cells. Only occasionally single noradrenaline cells exhibited light immunostaining for both enkephalins but no positive fibers could be found around the noradrenaline cells. In electron microscope the immunoreaction was seen in the granules of the adrenaline cells and in the large synaptic vesicles of the nerve terminals around the adrenaline cells. The present findings suggest that enkephalin-like immunoreactivity coexists mainly with adrenaline in rat adrenal medulla and that the enkephalin immunoreactive terminals regulate secretion of adrenaline from rat adrenal medulla.
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Pelto-Huikko, M., Salminen, T. & Hervonen, A. Localization of enkephalins in adrenaline cells and the nerves innervating adrenaline cells in rat adrenal medulla. Histochemistry 82, 377–383 (1985). https://doi.org/10.1007/BF00494067
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DOI: https://doi.org/10.1007/BF00494067