Exhaustion of blood glucose response and enhancement of insulin response after repeated glucagon injections in type-2 diabetes: Potentiation by progressive hyperglycemia

被引:0
作者
Castillo, MJ
Scheen, AJ
Paolisso, G
Lefebvre, PJ
机构
[1] CHU LIEGE, DEPT MED, DIV DIABET NUTR & METAB DISORDERS, B-4000 LIEGE 1, BELGIUM
[2] UNIV GRANADA, SCH MED, CLIN PHYSIOL UNIT, E-18071 GRANADA, SPAIN
关键词
C-peptide; glucagon; glucagon test; NIDDM;
D O I
暂无
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Aims: To investigate the hyperglycemic and insulinemic response to repeated glucagon injections in Type-2 (non-insulin-dependent) diabetic patients. Methods: In overnight fasted Type-2 diabetic patients, three i.v. glucagon (1 mg) injections were given as a bolus at two-hour intervals. In the hour preceding each glucagon injection, 6 patients received saline and they were tested at near-baseline blood glucose levels, while 8 patients received a glucose-controlled glucose infusion and they were tested at increasing blood glucose levels (7.5 +/- 0.2, 12.9 +/- 0.5 and 18.7 +/- 0.7 mmol/l). Blood samples were collected at 0, 3, 5, 10, 15, 30 and 60 min after each glucagon injection. Results: In the patients tested at near-baseline blood glucose levels, the blood glucose rise induced by glucagon was smaller after repeated injections. By contrast, the B-cell response to glucagon was well preserved. In the patients tested at increasing blood glucose levels, the blood glucose response to glucagon was abolished after repeated injections. By contrast, the B-cell response was significantly potentiated. The respective areas under the curve of plasma insulin levels in response to glucagon were 563 +/- 72, 1047 +/- 154 and 1844 +/- 305 m U x 30 min/l (p < 0.001). Conclusion: In Type-2 (non-insulin-dependent) diabetic patients, repeated glucagon injections, even when administered in a short (4 h) period of time, do not exhaust the B-cell. Endogenous insulin secretion is even potentiated at increasing blood glucose levels. By contrast, the hyperglycemic response to glucagon is significantly abolished, particularly at high blood glucose levels.
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页码:395 / 402
页数:8
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