Summary
The localization of bombesin- (BOMB) and enkephalin-(ENK) immunoreactive (IR) nerves was studied in rat coeliac-superior mesenteric ganglion complex in relation to neuropeptide Y (NPY)- and tyrosine hydroxylase (TH)-immunoreactive neurons with an immunofluorescence double-staining method. Very dense networks of BOMB-IR nerve terminals surrounded the majority of the principal ganglion cells, wheter or not they were TH-IR. BOMB-IR nerves were specifically related to the non-NPY-IR neurons. Moderately dense networks of ENK-IR fibers were unevenly distributed among the ganglion cells. Majority of these neurons exhibited TH-IR and some of them also contained NPY-IR. In sections double stained with antibodies to ENK and BOMB some nerve fibers contained both peptides. The findings suggest that BOMB-IR nerves, which have been previously demonstrated to originate from gut, control the function of non-NPY-IR ganglion cells. ENK-IR nerves apparently control the adrenergic neurons which project to gut and also some NPY-IR vasomotoric neurons. The finding that ENK- and BOMB-IR coexist in some nerves suggests that some ENK-IR nerves may originate from gut, although the major part probably represents preganglionic fibers originating from spinal cord.
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Järvi, R. Localization of bombesin-, neuropeptide Y-, enkephalin-and tyrosine hydroxylase-like immunoreactivities in rat coeliac-superior mesenteric ganglion. Histochemistry 92, 231–236 (1989). https://doi.org/10.1007/BF00500923
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DOI: https://doi.org/10.1007/BF00500923