Immunoneutralization of endogenous glucagon reduces hepatic glucose output and improves long-term glycemic control in diabetic ob/ob mice.

Abstract

In type 2 diabetes, glucagon levels are elevated in relation to the prevailing insulin and glucose levels. The relative hyperglucagonemia is linked to increased hepatic glucose output (HGO) and hyperglycemia. Antagonizing the effects of glucagon is therefore considered an attractive target for treatment of type 2 diabetes. In the current study, effects of eliminating glucagon signaling with a glucagon monoclonal antibody (mAb) were investigated in the diabetic ob/ob mouse. Acute effects of inhibiting glucagon action were studied by an oral glucose tolerance test (OGTT) and by measurement of HGO. In addition, the effects of subchronic (5 and 14 days) glucagon mAb treatment on plasma glucose, insulin, triglycerides, and HbA1c (A1C) levels were investigated. Glucagon mAb treatment reduced the area under the curve for glucose after an OGTT, reduced HGO, and increased the rate of hepatic glycogen synthesis. Glucagon mAb treatment for 5 days lowered plasma glucose and triglyceride levels, whereas 14 days of glucagon mAb treatment reduced A1C. In conclusion, acute and subchronic neutralization of endogenous glucagon improves glycemic control, thus supporting the contention that glucagon antagonism may represent a beneficial treatment of diabetes.

• Authors: Heidi Sørensen, Christian L Brand, Susanne Neschen, Jens Juul Holst, Keld Fosgerau, Erica Nishimura, Gerald I Shulman
• Journal: Diabetes (Diabetes) Vol. 55 Issue 10 Pg. 2843-8 (Oct 2006) ISSN: 0012-1797 [Print] United States
• PMID: 17003351 (Publication Type: Journal Article)

Chemical References

• Liver Glycogen
• Glucagon
• Glucose

Topics

• Animals
• Diabetes Mellitus, Type 2 (physiopathology)
• Female
• Glucagon (immunology, physiology)
• Glucose (metabolism)
• Hyperglycemia (physiopathology)
• Liver (drug effects, metabolism)
• Liver Glycogen (metabolism)
• Male
• Mice
• Mice, Obese