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Related Experiment Videos

D-propranolol and DL-propranolol both decrease conversion of L-thyroxine to L-triiodothyronine

P Heyma, R G Larkins, L Higginbotham

    British Medical Journal
    |July 5, 1980
    PubMed
    Summary
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    Propranolol and its isomer D-propranolol reduce thyroid hormone levels, specifically L-triiodothyronine (T3), in euthyroid individuals. This effect on thyroid hormone conversion is independent of beta-adrenergic blockade.

    Area of Science:

    • Endocrinology
    • Pharmacology

    Background:

    • Thyroid hormones, L-thyroxine (T4) and L-triiodothyronine (T3), regulate metabolism.
    • Propranolol is a beta-adrenergic blocker with potential effects on thyroid hormone metabolism.

    Purpose of the Study:

    • To investigate the impact of propranolol and D-propranolol on thyroid hormone metabolism.
    • To determine if propranolol's effect on T4 to T3 conversion is linked to its beta-adrenergic activity.

    Main Methods:

    • Studied six euthyroid volunteers and six hypothyroid patients receiving T4 replacement.
    • Administered DL-propranolol and D-propranolol to euthyroid subjects.
    • Administered D-propranolol to hypothyroid patients.
    • Conducted parallel in vitro investigations.

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    Main Results:

    • Both propranolol and D-propranolol decreased T3 concentrations and the T3/T4 ratio in euthyroid subjects.
    • D-propranolol decreased these variables in hypothyroid patients.
    • In vitro studies supported the in vivo findings.

    Conclusions:

    • Propranolol's influence on the conversion of T4 to T3 is not related to its beta-adrenergic blocking activity.
    • Propranolol may exhibit significant in vivo membrane-stabilizing effects at low therapeutic doses.