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Related Experiment Videos

New developments in the incretin concept.

W Creutzfeldt, R Ebert

    Diabetologia
    |August 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    The incretin effect, crucial for glucose regulation, is diminished in Type 2 diabetes. While gastric inhibitory polypeptide (GIP) is a key factor, other hormones likely contribute to this response.

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    Area of Science:

    • Endocrinology
    • Gastroenterology
    • Metabolic Research

    Background:

    • The incretin concept describes the enhanced insulin secretion following oral nutrient intake.
    • The nervous and humoral components of the entero-insular axis, regulating insulin release, are not fully understood.
    • Type 2 diabetes is associated with a reduced incretin effect.

    Purpose of the Study:

    • To investigate the role of gastric inhibitory polypeptide (GIP) and other potential factors in the incretin effect.
    • To explore the relationship between GIP secretion and the entero-insular axis in health and Type 2 diabetes.
    • To examine the direct metabolic effects of GIP independent of insulin secretion.

    Main Methods:

    • Review of experimental and clinical data over the past six years.

    Related Experiment Videos

  • Analysis of the incretin effect in denervated porcine pancreas models.
  • Assessment of GIP secretion and its correlation with entero-insular axis disturbances.
  • Evaluation of the impact of exogenous GIP and GIP antibodies on the incretin effect.
  • Measurement of insulin and C-peptide levels following oral glucose challenges.

    • Main Results:

    • The incretin effect is preserved after pancreatic denervation, suggesting a significant humoral component.
    • Type 2 diabetic patients exhibit a markedly decreased incretin effect.
    • Gastric inhibitory polypeptide (GIP) is a primary incretin, but its response is poorly correlated with entero-insular axis dysfunction in diabetes.
    • Physiological GIP levels do not fully replicate the incretin effect, and GIP antibodies do not abolish it, indicating other incretin factors.
    • GIP may have direct metabolic actions unrelated to insulinotropic effects.
    • The incretin effect is more accurately reflected by C-peptide than insulin measurements.
    • Reduced hepatic insulin extraction partially explains the incretin effect but GIP is not the primary regulator.

    Conclusions:

    • The incretin effect is mediated by both nervous and humoral factors, with GIP being a major but not sole contributor.
    • Significant alterations in the entero-insular axis and reduced incretin effect are characteristic of Type 2 diabetes.
    • The existence of additional, yet unidentified, humoral incretin factors is suggested.
    • GIP possesses metabolic functions beyond its insulin-releasing capacity, warranting further investigation.