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American Journal of Clinical Nutrition, Vol 47, 481-483, Copyright © 1988 by The American Society for Clinical Nutrition, Inc
ORIGINAL RESEARCH COMMUNICATIONS |
JA Cimino, RA Noto, CL Fusco and JM Cooperman
Department of Community and Preventive Medicine, New York Medical College, Valhalla 10595.
In the hypothyroid rat the flavin adenine dinucleotide (FAD) content of the liver is similar to that observed in rats maintained on a riboflavin-deficient diet. Thyroxine regulates the enzyme flavin kinase. Human adults with hypothyroidism have levels of erythrocyte glutathione reductase (EGR), an FAD-containing enzyme, in the range indicative of riboflavin deficiency, which can be corrected with thyroxine therapy. In the present study six newborns with severe congenital hypothyroidism because of athyrosis, ectopic thyroidism, or congenital hypothyroidism with Down's syndrome had normal levels of EGR, and treatment with thyroxine had no effect on these levels.
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