Immunohistochemical localization of (neuro)peptide hormones in endocrine cells and nerves of the gut of a stomachless teleost fish,Barbus conchonius (Cyprinidae) |
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Authors: | Dr. J. H. W. M. Rombout M. Reinecke |
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Affiliation: | (1) Department of Animal Morphology and Cell Biology, Agricultural University, Wageningen, The Netherlands;(2) Institute of Anatomy III, University of Heidelberg, Heidelberg, Federal Republic of Germany;(3) Department of Animal Morphology and Cell Biology, ZODIAC, Marijkeweg 40, 6709 PG Wageningen, The Netherlands |
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Abstract: | Summary Enteroendocrine cells containing glucagon-, substance P-, neurotensin- and VIP-like substances have been demonstrated immunocytochemically in the gut of Barbus conchonius. Mainly based on the distribution of the immunoreactive endocrine cells in this and a previous* study, at least eight different enteroendocrine cell types appear to be present in this stomachless fish: 1. C-terminal-gastrinimmunoreactive cells*, predominantly present in the upper parts of the folds of the proximal part of the intestinal bulb. 2. Metenkephalin-immunoreactive cells*, basally located in the folds of the first segment. 3. Pancreatic polypeptide (PP)-immunoreactive cells*, mainly present in the first half of the first segment. 4. Glucagon-like-immunoreactive (GLI) cells that are basally located in the folds of the first segment and that contain a different polypeptide (possibly glicentin) than pancreatic glucagon cells. 5. Substance P-immunoreactive cells, present in the upper parts of the folds throughout the gut. 6. C-terminal-neurotensin-immunoreactive cells, basally located in the folds throughout the first segment. 7. Vasoactive intestinal polypeptide (VIP)-immunoreactive cells, present in small numbers in the proximal part of the intestinal bulb. 8. Nonspecifically-immunoreactive cells*, found throughout the intestinal bulb. Many VIP-immunoreactive nerves have been demonstrated in the smooth muscle layer and myenteric plexus of the gut; furthermore some of them are peptide histidineisoleucine (PHI)-immunoreactive. Substance P-, somatostatin-, neurotensin- and met-enkephalin-immunoreactive nerves are also found. Thus, at least partial sequences of four different mammalian neuropeptide hormones (VIP, substance P, neurotensin, met-enkephalin) occur both in endocrine cells and enteric nerves of the gut of B. conchonius. |
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Keywords: | Enteroendocrine cells Innervation Neuropeptide immunocytochemistry Teleosts Gut hormones Intestine, small |
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