Summary
The present studies were directed to examine the effect of gastrin-releasing peptide (GRP) on β-adrenergic stimulated gastrin release by cultured rat antral mucosa and to assess the anatomical relationship between gastrin cells and GRP nerves in rat and human antrum. Peptide-containing cells were identified by application of an avidinbiotin-peroxidase immunocytochemical double staining method utilizing antibodies to GRP and gastrin prepared in rabbits. Rat antral mucosa was cultured for 60 min and gastrin released into the culture medium was measured by radioimmunoassay. Inclusion of antibodies to GRP in culture medium did not affect carbachol-stimulated gastrin release, whereas isoproterenol-stimulated gastrin release into the medium was inhibited significantly by addition of GRP antiserum to the culture medium. GRP-containing neurons and axonal fibers were stained immunocytochemically with diaminobenzidine (reddish-brown specific staining) and were located in the lamina propria adjacent to and surrounding the main lobules of antral glands. After double staining utilizing 4-Cl-1-Naphthol as substrate, blue stained gastrin-containing cells were identified in the middle and deeper regions of antral glands in close proximity to GRP neuronal elements. These studies suggest that β-adrenergic, but not cholinergic, stimulation of gastrin release is mediated, at least in part, through GRP. They also demonstrate intimate anatomical, as well as functional, relationships between gastrin cells and GRP-containing neurons.
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These studies were supported by Grant AM 13711 from the National Institutes of Health
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Jain, D.K., Wolfe, M.M. & McGuigan, J.E. Functional and anatomical relationships between antral gastrin cells and gastrin-releasing peptide neurons. Histochemistry 82, 463–467 (1985). https://doi.org/10.1007/BF02450481
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DOI: https://doi.org/10.1007/BF02450481