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Glucagon receptor knockout mice display increased insulin sensitivity and impaired beta-cell function

Sorensen, Heidi ; Sörhede Winzell, Maria LU ; Brand, Christian L. ; Fosgerau, Keld ; Gelling, Richard W. ; Nishimura, Erica and Ahrén, Bo LU (2006) In Diabetes 55(12). p.3463-3469
Abstract
In previous studies, glucagon receptor knockout mice (Gcgr(-/-)) display reduced blood glucose and increased glucose tolerance, with hyperglucagonemia and increased levels of glucagon-like peptide (GLP)-1. However, the role of glucagon receptor signaling for the regulation of islet function and insulin sensitivity is unknown. We therefore explored P-cell function and insulin sensitivity in Gcgr(-/-) and wild-type mice. The steady-state glucose infusion rate during hyperinsulinemic-euglycemic clamp was elevated in Gcgr(-/-) mice, indicating enhanced insulin sensitivity. Furthermore, the acute insulin response (AIR) to intravenous glucose was higher in Gcgr(-/-) mice. The augmented AIR to glucose was blunted by the GLP-1 receptor antagonist,... (More)
In previous studies, glucagon receptor knockout mice (Gcgr(-/-)) display reduced blood glucose and increased glucose tolerance, with hyperglucagonemia and increased levels of glucagon-like peptide (GLP)-1. However, the role of glucagon receptor signaling for the regulation of islet function and insulin sensitivity is unknown. We therefore explored P-cell function and insulin sensitivity in Gcgr(-/-) and wild-type mice. The steady-state glucose infusion rate during hyperinsulinemic-euglycemic clamp was elevated in Gcgr(-/-) mice, indicating enhanced insulin sensitivity. Furthermore, the acute insulin response (AIR) to intravenous glucose was higher in Gcgr(-/-) mice. The augmented AIR to glucose was blunted by the GLP-1 receptor antagonist, exendin-3. In contrast, AIR to intravenous administration of other secretagogues was either not affected (carbachol) or significantly reduced (arginine, cholecystokinin octapeptide) in Gcgr(-/-) mice. In islets isolated from Gcgr(-/-) mice, the insulin responses to glucose and several insulin secretagogues were all significantly blunted compared with wild-type mice. Furthermore, glucose oxidation was reduced in islets from Gcgr(-/-) mice. In conclusion, the present study shows that glucagon signaling is required for normal P-cell function and that insulin action is improved when disrupting the signal. In vivo, augmented GLP-1 levels compensate for the impaired beta-cell function in Gcgr(-/-) mice. (Less)
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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Diabetes
volume
55
issue
12
pages
3463 - 3469
publisher
American Diabetes Association Inc.
external identifiers
  • wos:000242446800032
  • scopus:33845522289
  • pmid:17130493
ISSN
1939-327X
DOI
10.2337/db06-0307
language
English
LU publication?
yes
id
91686c85-3d91-452d-96c7-22f543ef24cc (old id 685271)
date added to LUP
2016-04-01 16:45:43
date last changed
2021-10-03 04:14:05
@article{91686c85-3d91-452d-96c7-22f543ef24cc,
  abstract     = {In previous studies, glucagon receptor knockout mice (Gcgr(-/-)) display reduced blood glucose and increased glucose tolerance, with hyperglucagonemia and increased levels of glucagon-like peptide (GLP)-1. However, the role of glucagon receptor signaling for the regulation of islet function and insulin sensitivity is unknown. We therefore explored P-cell function and insulin sensitivity in Gcgr(-/-) and wild-type mice. The steady-state glucose infusion rate during hyperinsulinemic-euglycemic clamp was elevated in Gcgr(-/-) mice, indicating enhanced insulin sensitivity. Furthermore, the acute insulin response (AIR) to intravenous glucose was higher in Gcgr(-/-) mice. The augmented AIR to glucose was blunted by the GLP-1 receptor antagonist, exendin-3. In contrast, AIR to intravenous administration of other secretagogues was either not affected (carbachol) or significantly reduced (arginine, cholecystokinin octapeptide) in Gcgr(-/-) mice. In islets isolated from Gcgr(-/-) mice, the insulin responses to glucose and several insulin secretagogues were all significantly blunted compared with wild-type mice. Furthermore, glucose oxidation was reduced in islets from Gcgr(-/-) mice. In conclusion, the present study shows that glucagon signaling is required for normal P-cell function and that insulin action is improved when disrupting the signal. In vivo, augmented GLP-1 levels compensate for the impaired beta-cell function in Gcgr(-/-) mice.},
  author       = {Sorensen, Heidi and Sörhede Winzell, Maria and Brand, Christian L. and Fosgerau, Keld and Gelling, Richard W. and Nishimura, Erica and Ahrén, Bo},
  issn         = {1939-327X},
  language     = {eng},
  number       = {12},
  pages        = {3463--3469},
  publisher    = {American Diabetes Association Inc.},
  series       = {Diabetes},
  title        = {Glucagon receptor knockout mice display increased insulin sensitivity and impaired beta-cell function},
  url          = {http://dx.doi.org/10.2337/db06-0307},
  doi          = {10.2337/db06-0307},
  volume       = {55},
  year         = {2006},
}