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Perfluorooctanesulfonate (PFOS) is widely distributed and persistent in humans and wildlife. Prior toxicological studies have reported decreased total and free thyroid hormones in serum without a major compensatory rise in thyrotropin (TSH) or altered thyroid gland histology. Although these animals (rats, mice and monkeys) might have maintained an euthyroid state, the basis for hypothyroxinemia remained...
Decreases in serum total thyroxine (TT4) and free thyroxine (FT4) without a compensatory rise in thyroid stimulating hormone (thyrotropin or TSH) or histological changes of the thyroid have been observed in studies with perfluorooctanesulfonate (PFOS) treatments in rats. Prior observations do not fit the clinical profile of a hypothyroid state. PFOS is known to compete with fatty acids for albumin...
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