Gut hormones in cyclostomes |
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Authors: | Susan Van Noorden |
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Institution: | (1) Histopathology Department, Royal Postgraduate Medical School, Du Cane Road, W12 ONN London, England |
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Abstract: | The current state of knowledge about regulatory peptides in endocrine cells and nerves of the alimentary canal of lampreys
and hagfishes is reviewed. Cyclostomes have a wide range of peptides similar immunochemically to those of higher vertebrates.
They include, in the endocrine cells of the intestine, peptides resembling glucagon, gastrin/cholecystokinin, peptide YY (pancreatic
polypeptide/neuropeptide Y), substance P, vasoactive intestinal peptide, somatostatin and, in the larval stages at least,
insulin. The enteric nerves of some lamprey species contain peptides resembling bombesin (gastrin-releasing peptide) and calcitonin
gene-related peptide, as well as serotonin. The occurrence of other peptides is less well documented.
Little is known of the molecular structure or the biological roles of the enteric peptides in cyclostomes. Extraction, purification,
sequencing and physiological experiments are greatly needed. |
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Keywords: | cyclostome lamprey hagfish regulatory peptides neuropeptides pancreas intestine endocrine cells hormones |
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