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COMPARATIVE STUDY
JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Hypoglycemia following insulin and proinsulin. A comparison.
Hormone and Metabolic Research 1986 August
The counterregulatory hormonal response to proinsulin-induced hypoglycemia was investigated in eight volunteers. Proinsulin cleared slower from the circulation than insulin. Hypoglycemia occurred slower (2P less than 0.005) and was prolonged, while the overall hypoglycemic activities were comparable. The antilipolytic effect of proinsulin was also prolonged (2P less than 0.001). The response of epinephrine to hypoglycemia was less pronounced after proinsulin (2P less than 0.05). The amount of epinephrine was correlated to the rate of fall in plasma glucose (P less than 0.005). The production of lactate induced by beta-stimulation was also correlated to the fall of glucose (P less than 0.005). The responses of prolactin (2P less than 0.02), norepinephrine (2P less than 0.02), cortisol, and growth hormone were attenuated following proinsulin. The decreases of serum potassium and serum phosphate (2P less than 0.05) were less pronounced. Symptoms like sweating (2P less than 0.01) and dizziness (2P less than 0.01) were milder after proinsulin. It is concluded that the rate of fall in glucose concentration determines the differing counterregulatory responses. We don't relate the differing counterregulatory responses to special insulin-like properties of proinsulin, but to the slower kinetics which is emphasized by the intravenous bolus injection.
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