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Glucagon receptor antibody completely suppresses type 1 diabetes phenotype without insulin by disrupting a novel diabetogenic pathway

Wang, May-Yun
Yan, Hai
Shi, Zhiqing
Evans, Matthew R
Yu, Xinxin
Lee, Young
Chen, Shiuhwei
Williams, Annie
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Published in Proceedings of the National Academy of Sciences. 2015, vol. 112, no. 8, p. 2503-2508
Abstract Insulin monotherapy can neither maintain normoglycemia in type 1 diabetes (T1D) nor prevent the long-term damage indicated by elevated glycation products in blood, such as glycated hemoglobin (HbA1c). Here we find that hyperglycemia, when unaccompanied by an acute increase in insulin, enhances itself by paradoxically stimulating hyperglucagonemia. Raising glucose from 5 to 25 mM without insulin enhanced glucagon secretion ∼two- to fivefold in InR1-G9 α cells and ∼18-fold in perfused pancreata from insulin-deficient rats with T1D. Mice with T1D receiving insulin treatment paradoxically exhibited threefold higher plasma glucagon during hyperglycemic surges than during normoglycemic intervals. Blockade of glucagon action with mAb Ac, a glucagon receptor (GCGR) antagonizing antibody, maintained glucose below 100 mg/dL and HbA1c levels below 4% in insulin-deficient mice with T1D. In rodents with T1D, hyperglycemia stimulates glucagon secretion, up-regulating phosphoenolpyruvate carboxykinase and enhancing hyperglycemia. GCGR antagonism in mice with T1D normalizes glucose and HbA1c, even without insulin.
Keywords AnimalsAntibodies, Monoclonal/pharmacology/therapeutic useBlood Glucose/metabolismDiabetes Mellitus, Experimental/blood/drug therapy/pathologyDiabetes Mellitus, Type 1/blood/drug therapy/pathologyFemaleGlucagon/secretionHumansInsulin/therapeutic useMiceMice, Inbred NODParacrine Communication/drug effectsRatsRats, ZuckerReceptors, Glucagon/immunology
PMID: 25675519
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Research group Diabète et régulation des gènes (36)
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WANG, May-Yun et al. Glucagon receptor antibody completely suppresses type 1 diabetes phenotype without insulin by disrupting a novel diabetogenic pathway. In: National Academy of Sciences. Proceedings, 2015, vol. 112, n° 8, p. 2503-2508. doi: 10.1073/pnas.1424934112 https://archive-ouverte.unige.ch/unige:81175

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Deposited on : 2016-03-01

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