Lower blood glucose, hyperglucagonemia, and pancreatic α cell hyperplasia in glucagon receptor knockout mice

R. W. Gelling, X. Q. Du, D. S. Dichmann, J. Rømer, Huan Huang, L. Cui, S. Obici, B. Tang, J. J. Holst, C. Fledelius, P. B. Johansen, L. Rossetti, L. A. Jelicks, P. Serup, E. Nishimura, Maureen J. Charron

Research output: Contribution to journalArticle

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Abstract

Glucagon, the counter-regulatory hormone to insulin, is secreted from pancreatic α cells in response to low blood glucose. To examine the role of glucagon in glucose homeostasis, mice were generated with a null mutation of the glucagon receptor (Gcgr-/-). These mice display lower blood glucose levels throughout the day and improved glucose tolerance but similar insulin levels compared with control animals. Gcgr-/- mice displayed supraphysiological glucagon levels associated with postnatal enlargement of the pancreas and hyperplasia of islets due predominantly to α cell, and to a lesser extent, δ cell proliferation. In addition, increased proglucagon expression and processing resulted in increased pancreatic glucogen-like peptide 1 (GLP-1) (1-37) and GLP-1 amide (1-36 amide) content and a 3- to 10-fold increase in circulating GLP-1 amide. Gcgr-/- mice also displayed reduced adiposity and leptin levels but normal body weight, food intake, and energy expenditure. These data indicate that glucagon is essential for maintenance of normal glycemia and postnatal regulation of islet and α and δ cell numbers. Furthermore, the lean phenotype of Gcgr-/- mice suggests glucagon action may be involved in the regulation of whole body composition.

Original languageEnglish (US)
Pages (from-to)1438-1443
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume100
Issue number3
DOIs
StatePublished - Feb 4 2003

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Glucagon Receptors
Glucagon
Knockout Mice
Hyperplasia
Blood Glucose
Amides
Peptides
Proglucagon
Insulin
Glucose
Ideal Body Weight
Adiposity
Leptin
Body Composition
Islets of Langerhans
Energy Metabolism
Pancreas
Homeostasis
Cell Count
Eating

ASJC Scopus subject areas

  • Genetics
  • General

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Lower blood glucose, hyperglucagonemia, and pancreatic α cell hyperplasia in glucagon receptor knockout mice. / Gelling, R. W.; Du, X. Q.; Dichmann, D. S.; Rømer, J.; Huang, Huan; Cui, L.; Obici, S.; Tang, B.; Holst, J. J.; Fledelius, C.; Johansen, P. B.; Rossetti, L.; Jelicks, L. A.; Serup, P.; Nishimura, E.; Charron, Maureen J.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 100, No. 3, 04.02.2003, p. 1438-1443.

Research output: Contribution to journalArticle

Gelling, RW, Du, XQ, Dichmann, DS, Rømer, J, Huang, H, Cui, L, Obici, S, Tang, B, Holst, JJ, Fledelius, C, Johansen, PB, Rossetti, L, Jelicks, LA, Serup, P, Nishimura, E & Charron, MJ 2003, 'Lower blood glucose, hyperglucagonemia, and pancreatic α cell hyperplasia in glucagon receptor knockout mice', Proceedings of the National Academy of Sciences of the United States of America, vol. 100, no. 3, pp. 1438-1443. https://doi.org/10.1073/pnas.0237106100
Gelling, R. W. ; Du, X. Q. ; Dichmann, D. S. ; Rømer, J. ; Huang, Huan ; Cui, L. ; Obici, S. ; Tang, B. ; Holst, J. J. ; Fledelius, C. ; Johansen, P. B. ; Rossetti, L. ; Jelicks, L. A. ; Serup, P. ; Nishimura, E. ; Charron, Maureen J. / Lower blood glucose, hyperglucagonemia, and pancreatic α cell hyperplasia in glucagon receptor knockout mice. In: Proceedings of the National Academy of Sciences of the United States of America. 2003 ; Vol. 100, No. 3. pp. 1438-1443.
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