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- W2328614464 abstract "To evaluate reverse 3,3',5'-triiodothyronine (rT3) metabolism in nephrotic syndrome, serum rT3 kinetic studies from 10 nephrotics (mean urinary protein losses 7.0 g/day) with normal glomerular filtration rates (GFR; creatinine clearance 107 ml/min) were compared with 9 normal healthy subjects. Serum disappearance data were analyzed in a three-pool model, including rapidly (liver and kidney) and slowly (muscle, skin, and brain) equilibrating pools exchanging with serum, with all losses from the rapidly equilibrating pool. Serum free thyroxine (T4), determined by equilibrium dialysis, and parathyroid hormone levels were unaltered; total T4, T3, and rT3, and free rT3, albumin, and transferrin levels were significantly decreased; and free fractions of T4 and rT3 and thyroid-stimulating hormone (TSH) levels were increased. Despite reduced rT3 binding in serum, fractional transfer rates from serum to extravascular sites and serum clearance rates of total rT3 were unaltered. Free hormone clearance, serum appearance, and maximum hormone production rates were decreased. Total hormone transfer rates between serum and tissue pools and rT3 mass in serum and both tissue pools were reduced. Binding in the slowly equilibrating pool was decreased, and binding in both rapidly and slowly equilibrating pools was correlated with the free fraction of rT3 (r = -0.79, P = 0.007, and r = -0.70, P less than 0.025, respectively), with a shift of rT3 from the slow to the rapid pool. These findings suggest that binding of rT3 and T4 to serum carrier proteins is reduced, the transfer process for rT3 from serum to extravascular sites is decreased by factors in addition to reduced serum binding, degradation of rT3 is impaired, and decreased slow-pool binding may reflect reduced rT3 binding to serum-derived proteins in interstitial fluid. Furthermore, rT3 production rates are reduced, despite normal serum free T4 levels, accounting for low serum free rT3 concentrations. Total rT3 levels are decreased because of decrements in both serum binding and production rates." @default.
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- W2328614464 date "1991-04-01" @default.
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- W2328614464 title "rT3 metabolism in patients with nephrotic syndrome and normal GFR compared with normal subjects" @default.
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- W2328614464 doi "https://doi.org/10.1152/ajpendo.1991.260.4.e641" @default.
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