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Related Experiment Videos

Elevated serum angiotensin-converting enzyme in hyperthyroidism.

E Silverstein, G C Schussler, J Friedland

    The American Journal of Medicine
    |August 1, 1983
    PubMed
    Summary

    Serum angiotensin-converting enzyme (ACE) levels are elevated in hyperthyroidism, correlating with thyroid hormone concentrations. This suggests hyperthyroidism influences ACE levels, impacting conditions like sarcoidosis.

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    Area of Science:

    • Endocrinology
    • Biochemistry
    • Immunology

    Background:

    • Serum angiotensin-converting enzyme (ACE) is a key enzyme in the renin-angiotensin system.
    • Elevated serum ACE levels are associated with certain conditions, including sarcoidosis.
    • The relationship between thyroid hormones and serum ACE levels requires further elucidation.

    Purpose of the Study:

    • To investigate the association between thyroid dysfunction and serum angiotensin-converting enzyme (ACE) levels.
    • To explore the correlation between thyroid hormone concentrations and serum ACE activity.
    • To determine if triiodothyronine directly influences ACE synthesis in immune cells.

    Main Methods:

    • Measurement of serum ACE activity in patients with hyperthyroidism, hypothyroidism, and thyroiditis.
    • Correlation analysis between serum ACE levels and thyroid hormone indicators (thyroxine, triiodothyronine resin uptake).
    • In vitro experiments assessing the effect of triiodothyronine on ACE synthesis in cultured macrophages and monocytes.

    Main Results:

    • Serum ACE levels were significantly elevated in hyperthyroid patients (p < 0.001).
    • No significant elevation in serum ACE was observed in hypothyroid or thyroiditis patients.
    • Serum ACE positively correlated with serum thyroxine (r = 0.60, p < 0.01) and triiodothyronine resin uptake (r = 0.56, p < 0.01).
    • Triiodothyronine did not enhance ACE synthesis in cultured immune cells.

    Conclusions:

    • Hyperthyroidism is associated with elevated serum angiotensin-converting enzyme (ACE) levels.
    • The increase in serum ACE in hyperthyroidism appears to be independent of direct stimulation of ACE synthesis by thyroid hormones.
    • Consideration of hyperthyroidism in the evaluation of serum ACE may be beneficial for diagnosing and managing conditions like sarcoidosis.

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