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- W2038583828 abstract "3,5,3′-Triiodo-L-thyronine-125I (T3-125I) metabolism was studied in nine euthyroid human subjects on blocking doses of nonradioactive iodide. After the intravenous injection of T3-125I, the fractional disappearance rate of plasma radioactivity progressively disappearance rate of plasma radioactivity progressively decreased with time. Analysis of individual plasma samples by dialysis, electrophoretic, and extraction techniques revealed three radioactive components: T3-125I, iodide-125I, and an unidentified material which was nonextractable in acid butanol (NE125I). Ne125I rose to maximal levels 24-36 hr after injection of T3-125I and then decreased with a fractional rate which approached, after 12-14 days, approximately 0.05 day-1 (t½ = 14 days). The plasma T3-125I concentration, obtained by subtraction of iodide-125I and NE125I from the plasma total 125I, declined at a constant fractional rate with time with a t½ of 1.5 days. Qualitatively similar results were obtained in rats. After 72 hr, 57% of the plasma and 40% of the liver radioactivity was NE125I. Chromatographic purification of the T3-125I before injection did not alter these results. The extrathyroidal origin of NE125I was further demonstrated by similar results in thyroidectomized rats maintained on thyroxine. NE125I from human sera separated from the other radioiodinated substances by ion-exchange chromatography was quantitatively precipitated by trichloracetic acid, not dialyzable, insoluble in CHCl3:CH2OH, and migrated with albumin during starch-gel electrophoresis. Based on these properties, NE125I was tentatively identified as iodoalbumin. Observations in rats equilibrated with 125I, as well as nonradioactive iodine determinations in human sera before and after acid butanol extraction, indicate that 10-20% of the serum organic iodine is in the form of iodoprotein. Our studies suggest that this moiety may be derived at least in part from the peripheral metabolism of the thyroid hormones." @default.
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- W2038583828 date "1969-04-01" @default.
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- W2038583828 title "Formation of iodoprotein during the peripheral metabolism of 35,3′-triiodo-l-thyronine-125I in the euthyroid man and rat" @default.
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- W2038583828 doi "https://doi.org/10.1172/jci106026" @default.
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