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  • Title: Prohormone atrial natriuretic peptides 1-30 and 31-67 increase in hyperthyroidism and decrease in hypothyroidism.
    Author: Vesely DL, Winters CJ, Sallman AL.
    Journal: Am J Med Sci; 1989 Apr; 297(4):209-15. PubMed ID: 2523193.
    Abstract:
    Hyperthyroidism characteristically has natriuresis and vasodilation associated with it, whereas hypothyroidism is associated with impaired water excretion and vasoconstriction. This investigation was designed to determine if the plasma concentration(s) of three newly described hormones synthesized in the heart are increased in patients with hyperthyroidism and/or decreased in patients with hypothyroidism compared to normal subjects. The three hormones consist of amino acids 1-30, 31-67, and 99-126 (ANF) of the 126 amino acid prohormone of atrial natriuretic factor. Prohormone atrial natriuretic peptides (pro ANFs) 1-30, 31-67, and ANF were increased threefold, fourfold, and twofold respectively in hyperthyroid patients compared to the mean circulating concentration of 54 healthy persons without thyroid disease. Plasma concentrations of the three peptides in hypothyroid patients were only one-half that of the 54 persons without thyroid disease. With appropriate treatment of hyperthyroidism and hypothyroidism, the levels of the three peptides returned to normal. The peptide hormones increased proportionately with the increasing dosages of L-thyroxine of 50 micrograms/day and 100 micrograms/day in the hypothyroid patients. In persons with hypothyroidism complicated by congestive heart failure, the levels of pro ANFs 1-30, 31-67, and 99-126 were increased, demonstrating that abnormalities of salt and water metabolism are a strong stimulus to the release of these peptides.
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