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In this work, the presence of galanin was examined by immunohistochemistry, radioimmunoassay and high performance liquid chromatography (HPLC) in porcine nodose ganglia, mainly constituted of cell bodies from the vagal sensory neurons. Galanin-like immunoreactivity (Gal-LI) was revealed in 10 to 15% of the total cell bodies by the indirect immunofluorescent technique of Coons. For comparison, a positive staining was revealed in a few cell bodies of the submucous plexus and in fibers located in the different layers of the ileum. The extractable Gal-LI content in nodose ganglia was 7.2 +/- 0.8 pmol/g wet tissue, which represents a concentration about nine times lower than that found in the ileum. HPLC of extractable material revealed a predominant peak which coeluted with the synthetic peptide. We propose that, in pigs, galanin may play a role in the transmission of visceral information through the vagal afferences.
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Annals of anatomy = Anatomischer Anzeiger : official organ of the Anatomische Gesellschaft,
