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Islet amyloid polypeptide tonally inhibits β-, α-, and δ-cell secretion in isolated rat pancreatic islets

Authors :
Feng Wang
Thomas Gasslander
Johan Permert
Xian-Zhong Ding
Thomas E. Adrian
Gunilla T. Westermark
Source :
American Journal of Physiology-Endocrinology and Metabolism. 276:E19-E24
Publication Year :
1999
Publisher :
American Physiological Society, 1999.

Abstract

Islet amyloid polypeptide (IAPP, or amylin) is produced in pancreatic β-cells. The intraislet significance of IAPP is still uncertain. In the present study, paracrine effects of endogenous IAPP and somatostatin were investigated in isolated rat pancreatic islets. The intraislet IAPP activity was inhibited with an IAPP antiserum or a specific antagonist [IAPP-(8—37)]. Somatostatin activity was inhibited by immunoneutralization. Basal insulin and glucagon secretion were not affected by the somatostatin and/or IAPP blockade. Arginine-stimulated insulin and glucagon secretion were dose dependently increased by IAPP antiserum, IAPP-(8—37), and somatostatin antiserum, respectively. Arginine-stimulated somatostatin secretion was dose dependently potentiated by IAPP antiserum. Insulin secretion induced by 16.7 mM glucose was enhanced by IAPP antiserum and IAPP-(8—37), respectively. A combination of somatostatin antiserum with IAPP antiserum or IAPP-(8—37) further enhanced the arginine-stimulated insulin and glucagon secretion compared with effects when the blocking reagents were used individually. These results indicate that endogenously produced IAPP tonally inhibits stimulated insulin, glucagon, and somatostatin secretion. Furthermore, the paracrine effects of IAPP and somatostatin are additive.

Details

ISSN :
15221555 and 01931849
Volume :
276
Database :
OpenAIRE
Journal :
American Journal of Physiology-Endocrinology and Metabolism
Accession number :
edsair.doi.dedup.....bfe9ad8fe41b1631008ae3f92f786896