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• W2079226987 abstract "Human and rat placental homogenates contain inner ring deiodinase activity (PT4ase) towards T4 and T3. This activity may decrease the transfer of T4 and T3 across the placenta and influence thyroid hormone disposal in the fetal circulation. Data are now presented on human PT4ase in subcellular fractions, the Km of human PT4ase, and the effects of drugs and other compounds on human and rat PT4ase. The specific activity (nanograms of rT3 produced per min/mg protein) of each fraction of human placenta was as follows: nuclear, 0.07; mitochondrial, 0.15; lysosomal, 0.19; microsomal, 1.30; and cytosol, 0.01. The apparent Michaelis-Menton (Km) for PT4ase in human placental microsomes was 1.2 X 10(-7) M. T3, 3,3'-diiodothyronine, iopanoic acid, iodoacetic acid, diamide, and propranolol all exhibited dose-dependent inhibition of human and rat PT4ase when tested in the presence of 10 mM dithiothreitol (DTT). Propylthiouracil did not inhibit PT4ase at 10 mM DTT, but when the DTT concentration was lowered to 0.25 mM, up to 71% inhibition was noted. Many drugs, as noted in other organs with respect to outer and inner ring iodothyronine deiodinases, inhibited human PT4ase. These studies may be relevant to the practice of administering propylthiouracil, propranolol, and iopanoic acid to pregnant women." @default.
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• W2079226987 date "1984-02-01" @default.
• W2079226987 modified "2023-10-01" @default.
• W2079226987 title "The Effects of Propylthiouracil, Iodothyronines, and Other Agents on Thyroid Hormone Metabolism in Human Placenta*" @default.
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• W2079226987 doi "https://doi.org/10.1210/jcem-58-2-280" @default.
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