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Islet amyloid polypeptide inhibits glucagon release and exerts a dual action on insulin release from isolated islets.

Åkesson, Björn LU ; Panagiotidis, Georgios; Westermark, Per and Lundquist, Ingmar LU (2003) In Regulatory Peptides 111(1-3). p.55-60
Abstract
We have studied the influence of a wide concentration range of islet amyloid polypeptide (IAPP) on both glucagon and insulin release stimulated by various types of secretagogues. In an islet incubation medium devoid of glucose, the rate of glucagon release being high, we observed a marked suppressive action by low concentrations of IAPP, 10−10 and 10−8 M, on glucagon release. Similarly, glucagon release stimulated by Image-arginine, the cholinergic agonist carbachol, or the phosphodiesterase inhibitor isobutylmethyl xanthine (IBMX), an activator of the cyclic AMP system, was inhibited by IAPP in the 10−10 and 10−8 M concentration range. Moreover, basal glucagon release at 7 and 10 mM glucose was suppressed by IAPP. In contrast, IAPP... (More)
We have studied the influence of a wide concentration range of islet amyloid polypeptide (IAPP) on both glucagon and insulin release stimulated by various types of secretagogues. In an islet incubation medium devoid of glucose, the rate of glucagon release being high, we observed a marked suppressive action by low concentrations of IAPP, 10−10 and 10−8 M, on glucagon release. Similarly, glucagon release stimulated by Image-arginine, the cholinergic agonist carbachol, or the phosphodiesterase inhibitor isobutylmethyl xanthine (IBMX), an activator of the cyclic AMP system, was inhibited by IAPP in the 10−10 and 10−8 M concentration range. Moreover, basal glucagon release at 7 and 10 mM glucose was suppressed by IAPP. In contrast, IAPP exerted a dual action on insulin release. Hence, low concentrations of IAPP brought about a modest increase of basal insulin secretion at 7 mM glucose and also of insulin release stimulated by carbachol. High concentrations of IAPP, however, inhibited insulin release stimulated by glucose (10 and 16.7 mM), IBMX, carbachol and Image-arginine. In conclusion, our data suggest that IAPP has complex effects on islet hormone secretion serving as an inhibitor of glucagon release and having a dual action on insulin secretion exerting mainly a negative feedback on stimulated and a positive feedback on basal insulin release. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Phosphodiesterase inhibition, Image-Arginine, slet secretory mechanisms, Glucose, Cholinergic agonist
in
Regulatory Peptides
volume
111
issue
1-3
pages
55 - 60
publisher
Elsevier
external identifiers
  • pmid:12609749
  • wos:000181621700007
  • scopus:0037471369
ISSN
1873-1686
DOI
10.1016/S0167-0115(02)00252-5
language
English
LU publication?
yes
id
ac41c821-9529-4c2e-8f2a-3620fca1fbb7 (old id 113079)
alternative location
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12609749&dopt=Abstract
date added to LUP
2007-07-09 15:47:02
date last changed
2018-09-02 03:35:24
@article{ac41c821-9529-4c2e-8f2a-3620fca1fbb7,
  abstract     = {We have studied the influence of a wide concentration range of islet amyloid polypeptide (IAPP) on both glucagon and insulin release stimulated by various types of secretagogues. In an islet incubation medium devoid of glucose, the rate of glucagon release being high, we observed a marked suppressive action by low concentrations of IAPP, 10−10 and 10−8 M, on glucagon release. Similarly, glucagon release stimulated by Image-arginine, the cholinergic agonist carbachol, or the phosphodiesterase inhibitor isobutylmethyl xanthine (IBMX), an activator of the cyclic AMP system, was inhibited by IAPP in the 10−10 and 10−8 M concentration range. Moreover, basal glucagon release at 7 and 10 mM glucose was suppressed by IAPP. In contrast, IAPP exerted a dual action on insulin release. Hence, low concentrations of IAPP brought about a modest increase of basal insulin secretion at 7 mM glucose and also of insulin release stimulated by carbachol. High concentrations of IAPP, however, inhibited insulin release stimulated by glucose (10 and 16.7 mM), IBMX, carbachol and Image-arginine. In conclusion, our data suggest that IAPP has complex effects on islet hormone secretion serving as an inhibitor of glucagon release and having a dual action on insulin secretion exerting mainly a negative feedback on stimulated and a positive feedback on basal insulin release.},
  author       = {Åkesson, Björn and Panagiotidis, Georgios and Westermark, Per and Lundquist, Ingmar},
  issn         = {1873-1686},
  keyword      = {Phosphodiesterase inhibition,Image-Arginine,slet secretory mechanisms,Glucose,Cholinergic agonist},
  language     = {eng},
  number       = {1-3},
  pages        = {55--60},
  publisher    = {Elsevier},
  series       = {Regulatory Peptides},
  title        = {Islet amyloid polypeptide inhibits glucagon release and exerts a dual action on insulin release from isolated islets.},
  url          = {http://dx.doi.org/10.1016/S0167-0115(02)00252-5},
  volume       = {111},
  year         = {2003},
}