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Insulin release, insulin sensitivity, and glucose intolerance

S Efendić, A Wajngot, E Cerasi

    Proceedings of the National Academy of Sciences of the United States of America
    |December 1, 1980
    PubMed
    Summary

    Glucose intolerance is linked to reduced insulin release and sensitivity. Impaired glucose tolerance affects beta-cell function and insulin action, impacting blood sugar regulation.

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    Area of Science:

    • Endocrinology
    • Metabolic Research
    • Diabetes Pathophysiology

    Background:

    • Glucose intolerance represents a spectrum of metabolic dysfunction.
    • Understanding beta-cell function and insulin sensitivity is crucial for diabetes research.

    Purpose of the Study:

    • To assess beta-cell insulin secretory capacity and insulin sensitivity in varying degrees of glucose intolerance.
    • To differentiate the roles of glucose-stimulated insulin release (initiatory and potentiatory effects) and insulin sensitivity.

    Main Methods:

    • Subjects were grouped by fasting blood glucose and glucose tolerance tests (oral and intravenous).
    • A standardized glucose infusion test was employed.
    • Computer analysis quantified insulin release parameters (KI, IP, KP) and insulin sensitivity (KG).

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    Main Results:

    • Impaired oral glucose tolerance showed decreased insulin sensitivity (KG) and increased potentiation (KP), with normal initial release (KI, IP).
    • Subjects with both impaired oral and IV glucose tolerance, and mild diabetes, exhibited decreased KI, IP, and KG, with normal KP.
    • Initial insulin release (KI, IP) was lower in impaired glucose tolerance subjects compared to controls with similar insulin sensitivity (KG).

    Conclusions:

    • All stages of glucose intolerance are associated with diminished glucose-initiated insulin release and reduced insulin sensitivity.
    • Compensatory enhancement of glucose's potentiatory effect on insulin release may occur in certain glucose intolerance stages.