title: The relationships of nicotinamide adenine dinucleotide phosphate-d to nitric oxide synthase, vasoactive intestinal polypeptide, galanin and pituitary adenylate activating polypeptide in pigeon gut neurons.
abstract: The distribution of nicotinamide adenine dinucleotide phosphate (NADPH)-d neurons and their relationship with nitric oxide synthase (NOS), vasoactive intestinal polypeptide (VIP), pituitary adenylate activating polypeptide (PACAP) and galanin (Gal) were examined in the gastrointestinal (GI) tract of the pigeon Columbia livia. NADPH-d-histochemistry, indirect immunofluorescence and confocal analysis were applied to cryosections. Western blot analysis was also applied on pigeon gut. NADPH-d neurons were found throughout the pigeon GI tract and they were evident in the myenteric, circular muscle and submucous plexuses. Positive varicose nerve fibres were also distributed within the longitudinal muscle layers and in the lamina propria of the mucosa. The stomach was the segment richest in positivities. The copresence VIP/Gal/NOS as well as PACAP/VIP were revealed in some NADPH-d-neurons. We suppose that the nitrergic nerve population of the pigeon GI tract belong to the muscle motility regulation as an inhibitory descending nerve pathway. Moreover the presence of VIP, Gal and PACAP in some NADPH-d-containing neurons enhances the inhibitory actions of these neurotransmitters whereas PACAP and Gal role is actually unknown.
authors.affiliation: Department of Biological Structures, Functions and Technology, University of Naples 'Federico II' via Veterinaria 1, 80137, Naples, Italy.
authors.forename: N
authors.initials: N
authors.lastname: Mirabella
authors.forename: C
authors.initials: C
authors.lastname: Lamanna
authors.forename: L
authors.initials: L
authors.lastname: Assisi
authors.forename: V
authors.initials: V
authors.lastname: Botte
authors.forename: A
authors.initials: A
authors.lastname: Cecio
mesh_terms: D000818:Animals; D010856:Columbidae; D004064:Digestive System / Q000737:chemistry / Q000201:enzymology* / Q000294:innervation*; D017615:Enteric Nervous System / Q000737:chemistry / Q000201:enzymology; D019004:Galanin / Q000378:metabolism; D018613:Microscopy, Confocal; D008856:Microscopy, Fluorescence; D009252:NADPH Dehydrogenase / Q000378:metabolism*; D009419:Nerve Tissue Proteins / Q000378:metabolism*; D009479:Neuropeptides / Q000378:metabolism; D019001:Nitric Oxide Synthase / Q000378:metabolism*; D052248:Nitric Oxide Synthase Type I; D051219:Pituitary Adenylate Cyclase-Activating Polypeptide; D014660:Vasoactive Intestinal Peptide / Q000378:metabolism
chemical_list: D009419:Nerve Tissue Proteins; D009479:Neuropeptides; D051219:Pituitary Adenylate Cyclase-Activating Polypeptide; D014660:Vasoactive Intestinal Peptide; D019004:Galanin; D019001:Nitric Oxide Synthase; D052248:Nitric Oxide Synthase Type I; D009252:NADPH Dehydrogenase