Summary
The distribution of peptide hormone-like immunostaining in the gastrointestinal tract of 11 teleost species was investigated by immunofluorescence.
Cells immunoreactive for somatostatin were found in the glandular epithelium of the stomach of four species and in the epithelium of the pyloric appendage of one species. The mid-gut epithelium contained cells reactive with antibodies to glucagon (three species), gastrin (five species), pancreatic polypeptide (five species), and substance P (two species). Cells immunoreactive for met-enkephalin were found in the epithelium of both the mid-gut and the stomach of six species.
In six species in which the endocrine pancreas was investigated, insulin-, glucagon-, and somatostatin-like immunoreactivity was observed. Pancreatic polypeptide was definitely localised by immunostaining in cells of the endocrine pancreas of only one out of three species examined.
Vasoactive intestinal polypeptide-, neurotensin-, bombesin-, and enkephalin-like immunoreactivity was identified in the gastrointestinal nerve fibres in various species.
In view of the considerable species variation found, caution should be exercised in generalising about the peptides present in the gastrointestinal tract of fish.
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Langer, M., Van Noorden, S., Polak, J.M. et al. Peptide hormone-like immunoreactivity in the gastrointestinal tract and endocrine pancreas of eleven teleost species. Cell Tissue Res. 199, 493–508 (1979). https://doi.org/10.1007/BF00236085
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DOI: https://doi.org/10.1007/BF00236085