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Related Experiment Videos

Acromegaly and insulin resistance: a case study.

J M García López, A De la Fuente, M A Tomé

    Acta Endocrinologica
    |April 1, 1986
    PubMed
    Summary

    Elevated growth hormone (GH) levels in acromegaly cause insulin resistance, impairing glucose metabolism. Reducing GH with bromocriptine treatment improved glucose tolerance and insulin sensitivity in a patient.

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    Area of Science:

    • Endocrinology
    • Metabolic Research

    Background:

    • Acromegaly is characterized by elevated growth hormone (GH) levels, which are known to affect glucose metabolism and insulin sensitivity.
    • Understanding the precise relationship between GH levels and impaired glucose tolerance is crucial for managing acromegaly patients.

    Observation:

    • This study investigated glucose metabolism in a single acromegaly patient with varying endogenous GH levels.
    • Insulin-induced glucose decline was measured before and after bromocriptine treatment to lower GH levels.

    Findings:

    • High GH levels (120 µg/l) were associated with significantly impaired glucose metabolism, evidenced by a slower decline in blood glucose and longer time to reach normoglycemia.
    • After bromocriptine treatment reduced GH to 8 µg/l, glucose metabolism markedly improved, with a steeper glucose decline, shorter time to normoglycemia, and increased glucose clearance.

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  • Specific metrics like the slope of glucose decrease, time to normoglycemia, glucose pool elimination, and total glucose clearance demonstrated significant improvements post-treatment.

    • Implications:

    • This case study highlights that elevated endogenous GH directly induces insulin resistance in acromegaly.
    • Pharmacological reduction of GH levels, as demonstrated with bromocriptine, can effectively reverse insulin resistance and improve glucose metabolism.
    • These findings underscore the importance of GH level management in mitigating metabolic complications associated with acromegaly.