Insulin Signaling in α Cells Modulates Glucagon Secretion In Vivo
Open accessAbstract
Glucagon plays an important role in glucose homeostasis by regulating hepatic glucose output in both normo- and hypoglycemic conditions. In this study, we created and characterized alpha cell-specific insulin receptor knockout (alphaIRKO) mice to directly explore the role of insulin signaling in the regulation of glucagon secretion in vivo. Adult male alphaIRKO mice exhibited mild glucose intolerance, hyperglycemia, and hyperglucagonemia in the fed state and enhanced glucagon secretion in response to L-arginine stimulation. Hyperinsulinemic-hypoglycemic clamp studies revealed an enhanced glucagon secretory response and an abnormal norepinephrine response to hypoglycemia in alphaIRKO mice. The mutants also exhibited an age-dependent increase in beta cell mass. Furthermore, siRNA-mediated knockdown of insulin receptor in glucagon-secreting InR1G cells promoted enhanced glucagon secretion and complemented our in vivo findings. Together, these data indicate a significant role for intraislet insulin signaling in the regulation of alpha cell function in both normo- and hypoglycemic conditions.
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Blocking insulin signalling in islet alpha-cells in mice results in defective suppression of the fed state on glucagon secretion, highlighting the pivotal role of insulin in regulation of the alpha-cell.
“However, studies have demonstrated that blocking insulin signalling in islet alpha-cells in mice results in defective suppression of the fed state on glucagon secretion, highlighting the pivotal role of insulin in the regulation of the alpha-cell.105,149”
From A review of current trends with type 2 diabetes epidemiology, aetiology, pathogenesis, treatments and future perspectives (2021) · cites this paper as [149]
Dysfunctional glucagon secretion in T2D could be due to decreased insulin levels, as insulin suppresses alpha-cell function.
“The dysfunctional glucagon secretion in T2D could be due to the decreased insulin levels, as insulin suppresses alpha-cell function.105,149”
From A review of current trends with type 2 diabetes epidemiology, aetiology, pathogenesis, treatments and future perspectives (2021) · cites this paper as [149]
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- Authors
- Kawamori, D., Kurpad, A. J., Hu, J., Liew, C. W., Shih, J. L., Ford, E. L., Herrera, P. L., Polonsky, K. S., McGuinness, O. P., & Kulkarni, R. N.
- Affiliations
- Joslin Diabetes Center (US)
- Washington University in St. Louis (US)
- University of Geneva (CH)
- Vanderbilt University (US)
- Corresponding author
- Kulkarni, Rohit N.
- Venue
- Cell Metabolism
- Publisher
- Elsevier BV
- Published
- 2009-04
- Volume
- 9
- Issue
- 4
- Pages
- 350-361
- ISSN
- 1550-4131 (ISSN-L)
- PMC
- PMC2694613
- OpenAlex
- W2054111620
- Cited by
- 316
- References
- 65
- Citations by year
- 2026: 13 · 2025: 13 · 2024: 12 · 2023: 12 · 2022: 17 · 2021: 22 · 2020: 17 · 2019: 22 · 2018: 20 · 2017: 19 · 2016: 15 · 2015: 24 · 2014: 27 · 2013: 16 · 2012: 18
- FWCI
- 22.39
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Cell Metabolism (publishedVersion)
- PubMed (publishedVersion)
- Archive ouverte UNIGE (University of Geneva) (publishedVersion, other-oa)
- PubMed Central (acceptedVersion)
- Archive ouverte UNIGE (University of Geneva) (submittedVersion, cc-by)
- Funders
- National Institutes of Health (UL1TR000448, 5p60dk020593-31)
- National Institute of Diabetes and Digestive and Kidney Diseases (P60-DK020593, R01DK031842, DK-31842, DK59637, DK56341, DK 20593, U24DK059637, DK-67536, R37DK031842, P30DK036836, P30DK056341, R01DK067536, P30DK020593)
- National Center for Research Resources (UL1RR024992)
- National Center for Advancing Translational Sciences
- Topics
- Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Treatment and Management
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Diabetes and associated disorders
- Keywords
- insulin signaling, alpha cells, glucagon secretion, insulin receptor, glucose homeostasis, hyperglucagonemia, hypoglycemia, norepinephrine, beta-cell mass, hepatic glucose production
- MeSH terms
- Animals, Arginine, Diabetes Mellitus, Experimental, Fasting, Feeding Behavior, Gene Expression Regulation, Glucagon, Hyperinsulinism, Hypoglycemia, Insulin, Organ Specificity, Organ Size, Receptor, Insulin, Streptozocin, Signal Transduction, Glucose Intolerance, Mice, Knockout, Glucagon-Secreting Cells, Insulin-Secreting Cells, Mice
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Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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