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Interaction of glucagon-like peptide-I (GLP-I) and galanin in insulin (βTC-1)- and somatostatin (RIN T3)-secreting cells and evidence that both peptides have no receptors on glucagon (INR1G9)-secreting cells

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Abstract

The interaction of glucagon-like peptide-I (GLP-I) and galanin in clonal endocrine pancreatic cells was characterized. By Northern blot analysis the presence of GLP-I receptor mRNA was shown in B (\TC-1 cells) and D (RIN 1048-38) cells but not in A (INR1 G9) cells, thus confirming functional data demonstrating the absence of active GLP-I receptors on glucagon-producing cells. Galanin receptors were detected on B and D cells but not on A cells. In B and D cells galanin inhibited the GLP-I stimulated adenylate cyclase activity. Treatment of insulin-and somatostatin-producing cells with GLP-I increased intracellular cAMP levels, and this was dampened by galanin. GLP-I stimulated the activity of protein kinase A in B and D cells, which was also inhibited by galanin. Galanin alone did not influence B- and D-cell function. These data show that in the endocrine pancreas B and D cells but not A cells express GLP-I and galanin receptors. The interaction of GLP-I and galanin occurs at the level of adenylate cyclase. Galanin might act in the endocrine pancreas as a physiological inhibitor of the potent incretin hormone GLP-I. Therefore, we suggest galanin is a ‘decretin’.

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Authors and Affiliations

  1. Clinical Research Unit for Gastrointestinal Endocrinology, Department of Medicine, Philipps-University, Baldingerstrasse, D-35033, Marburg, Germany

    H. -C. Fehmann, M. Janßen & B. Göke

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  1. H. -C. Fehmann
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  2. M. Janßen
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  3. B. Göke
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Fehmann, H.C., Janßen, M. & Göke, B. Interaction of glucagon-like peptide-I (GLP-I) and galanin in insulin (βTC-1)- and somatostatin (RIN T3)-secreting cells and evidence that both peptides have no receptors on glucagon (INR1G9)-secreting cells. Acta Diabetol 32, 176–181 (1995). https://doi.org/10.1007/BF00838488

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  • DOI: https://doi.org/10.1007/BF00838488

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