Helodermin and islet hormone release in isolated rat pancreas.
The effect of helodermin (1,10,100 pmol/L), a new member of the VIP/secretin/glucagon peptide family, was investigated in glucose- (10 mmol/L) and arginine- (10 mmol/L) induced insulin, glucagon, and somatostatin secretion from the isolated perfused rat pancreas. Helodermin stimulated the somatostatin release in a concentration-dependent manner during the first (controls, 100%; 1 pmol/L, 113%, ns; 10 pmol/L, 175%, p less than 0.05; 100 pmol/L, 233%, p less than 0.05) and the second secretion phases (controls, 100%; 1 pmol/L, 117%, ns; 10 pmol/L, 210%, p less than 0.05; 100 pmol/L, 362%, p less than 0.05). There was a biphasic glucagon response with an inhibition during the first phase (controls, 100%; 1 pmol/L, 92%; 10 pmol/L, 63%, p less than 0.05; 100 pmol/L, 52%, p less than 0.05%) and a stimulation during the second phase (controls, 100%; 1 pmol/L, 117%, ns; 10 pmol/L, 210%, p less than 0.05; 100 pmol/L, 362%, p less than 0.05). Helodermin had weak stimulatory effects on pancreatic beta cells with a maximum at 10 pmol/L (first phase: controls, 100%; 1 pmol/L, 96%, ns; 10 pmol/L, 148%, p less than 0.05; 100 pmol/L, 136%, ns; second phase: controls, 100%; 1 pmol/L, 104%, ns; 10 pmol/L, 170%, p less than 0.05; 100 pmol/L, 136%, ns).
Department of Internal Medicine, Phillipps-University of Marburg, FRG.
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HC
Fehmann
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Göke
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Göke
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Eissele
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Arnold
D000818:Animals; D001120:Arginine / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D005934:Glucagon / Q000378:metabolism*; D005947:Glucose / Q000494:pharmacology; D007328:Insulin / Q000378:metabolism*; D000078790:Insulin Secretion; D036341:Intercellular Signaling Peptides and Proteins; D007515:Islets of Langerhans / Q000187:drug effects* / Q000378:metabolism; D008297:Male; D010455:Peptides / Q000008:administration & dosage / Q000494:pharmacology*; D011863:Radioimmunoassay; D051381:Rats; D011919:Rats, Inbred Strains; D013004:Somatostatin / Q000378:metabolism*; D014688:Venoms / Q000494:pharmacology
D007328:Insulin; D036341:Intercellular Signaling Peptides and Proteins; D010455:Peptides; D014688:Venoms; D013004:Somatostatin; C040442:heliodermin; D005934:Glucagon; D001120:Arginine; D005947:Glucose