Summary
The relationship between insulin and the glucose-glucagon feedback mechanism was studied by testing the effectiveness of various routes, doses and timing of insulin administration prior to and during a glucose tolerance test in Peking ducks made transiently diabetic by subtotal pancreatectomy. Insulin injections or infusions given either before, or only during the glucose load, did not restore the A-cell response to glucose. Yet, if given both before and during the glucose test, in conditions which mimic the physiological basal insulin level and its variations (with, initially, intramuscular injections of 0.2 IU/kg and 8 μg/kg glucagon, every six hours, and then an intravenous injection of 3.6 mU/kg plus an infusion of 0.9 mU/kg/ minute for one hour), the normal glucagon response to glucose was re-established. Insulin must therefore be present, both before and during glucose stimulation, for glucose to be effective as an A-cell suppressor.
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This work was supported by the CNRS (ERA 188) and the INSERM.
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Laurent, F., Mialhe, P. Insulin and the glucose-glucagon feedback mechanism in the duck. Diabetologia 12, 23–33 (1976). https://doi.org/10.1007/BF01221961
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DOI: https://doi.org/10.1007/BF01221961