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Topography of somatostatin cells in the stomach of the rat: Possible functional significance

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Summary

Somatostatin cells in the stomach of the rat have a characteristic shape and distribution. In the antral mucosa they occur together with gastrin cells and enterochromaffin cells at the base of the glands. In the oxyntic mucosa they are scattered along the entire glands with some predominance in the zone of parietal cells. Throughout the gastric mucosa the somatostatin cells possess long and slender processes that emerge from the base of the cell and end in clublike swellings. Such processes appear to contact a certain proportion of neighbouring gastrin cells in the antral mucosa and parietal cells in the oxyntic mucosa.

Exogenous somatostatin given by intravenous infusion to conscious rats counteracted the release of gastrin stimulated by feeding, elevated antral pH or vagal excitation. Gastrin causes parietal cells to secrete HCl and endocrine cells in the oxyntic mucosa to mobilise and synthesise histamine. Somatostatin is known to block the response of the parietal cells to gastrin. In contrast, somatostatin did not block the response of the histamine-storing endocrine cells to gastrin, perhaps because these endocrine cells lack receptors to somatostatin. Conceivably, somatostatin in the gastric mucosa has a paracrine mode of action. The observations of the present study suggest that somatostatin may affect some, but not all of the various cell types in the stomach. Under physiological conditions this selectivity may be achieved in the following ways: 1) Communication may be based on direct cell-to-cell contact. 2) Only certain cell types are supplied with somatostatin receptors.

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Authors and Affiliations

  1. Departments of Pharmacology, Surgery, and Histology, University of Lund, Lund, Sweden

    J. Alumets, M. Ekelund, H. A. El Munshid,  R. Håkanson, I. Lorén & F. Sundler

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  1. J. Alumets
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  2. M. Ekelund
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  3. H. A. El Munshid
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  4. R. Håkanson
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  5. I. Lorén
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  6. F. Sundler
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Alumets, J., Ekelund, M., El Munshid, H.A. et al. Topography of somatostatin cells in the stomach of the rat: Possible functional significance. Cell Tissue Res. 202, 177–188 (1979). https://doi.org/10.1007/BF00232233

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