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Department of Internal Medicine III, Erasmus University Medical School (K.R., E.K., J.P.S., H.v.T., W.W.d.H., E.P.K., T.J.V.), Rotterdam, The Netherlands; Department of Obstetrics and Gynaecology, University of Dundee, Ninewells Hospital and Medical School (K.R., R.H.), Dundee, United Kingdom; Department of Pathology, Erasmus University Medical School (J.C.d.H.), Rotterdam, The Netherlands; and Department of Nuclear Medicine, University Hospital Dijkzigt (E.P.K.), Rotterdam, The Netherlands
Address all correspondence and requests for reprints to: Theo J. Visser, Department of Internal Medicine III, Erasmus University Medical School, P.O. Box 1738, Room Bd. 234, 3000 DR Rotterdam, The Netherlands. E-mail: visser{at}inw3.azr.nl
The role of the deiodinases D1, D2, and D3 in the tissue-specific and time-dependent regulation of thyroid hormone bioactivity during fetal development has been investigated in animals but little is known about the ontogeny of these enzymes in humans. We analyzed D1, D2, and D3 activities in liver microsomes from 10 fetuses of 1520 weeks gestation and from 8 apparently healthy adult tissue transplant donors, and in liver homogenates from 2 fetuses (20 weeks gestation), 5 preterm infants (2732 weeks gestation), and 13 term infants who survived up to 39 weeks postnatally. D1 activity was determined using 1 µM [3',5'-125I]rT3 as substrate and 10 mM dithiothreitol (DTT) as cofactor, D2 activity using 1 nM [3',5'-125I]T4 and 25 mM DTT in the presence of 1 mM 6-propyl-2-thiouracil (to block D1 activity) and 1 µM T3 (to block D3 activity), and D3 activity using 10 nM [3,5-125I]T3 and 50 mM DTT, by quantitation of the release of 125I-. The assays were validated by high performance liquid chromatography of the products, and kinetic analysis [Michaelis-Menten constant (Km) of rT3 for D1: 0.5 µM; Km of T3 for D3: 2 nM]. In liver homogenates, D1 activity was not correlated with age, whereas D3 activity showed a strong negative correlation with age (r -0.84), with high D3 activities in preterm infants and (except in 1 infant of 35 weeks) absent D3 activity in full-term infants. In microsomes, D1 activities amounted to 4.360 pmol/min/mg protein in fetal livers and to 170313 pmol/min/mg protein in adult livers, whereas microsomal D3 activities were 0.151.45 pmol/min/mg protein in fetuses and <0.1 pmol/min/mg protein in all but one adult. In the latter sample, D3 activity amounted to 0.36 pmol/min/mg protein. D2 activity was negligible in both fetal and adult livers. These findings indicate high D1 and D3 activities in fetal human liver, and high D1 and mostly absent D3 activities in adult human liver. Therefore, the low serum T3 levels in the human fetus appear to be caused by high hepatic (and placental) D3 activity rather than caused by low hepatic D1 activity. The occasional expression of D3 in adult human liver is intriguing and deserves further investigation.
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G. G. J. M. Kuiper, W. Klootwijk, and T. J. Visser Substitution of Cysteine for Selenocysteine in the Catalytic Center of Type III Iodothyronine Deiodinase Reduces Catalytic Efficiency and Alters Substrate Preference Endocrinology, June 1, 2003; 144(6): 2505 - 2513. [Abstract] [Full Text] [PDF] |
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P. Cettour-Rose, A. G. Burger, C. A. Meier, T. J. Visser, and F. Rohner-Jeanrenaud Central stimulatory effect of leptin on T3 production is mediated by brown adipose tissue type II deiodinase Am J Physiol Endocrinol Metab, November 1, 2002; 283(5): E980 - E987. [Abstract] [Full Text] [PDF] |
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C. A. Shepherdley, C. B. Daniels, S. Orgeig, S. J. Richardson, B. K. Evans, and V. M. Darras Glucocorticoids, thyroid hormones, and iodothyronine deiodinases in embryonic saltwater crocodiles Am J Physiol Regulatory Integrative Comp Physiol, November 1, 2002; 283(5): R1155 - R1163. [Abstract] [Full Text] [PDF] |
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A L Ogilvy-Stuart Neonatal thyroid disorders Arch. Dis. Child. Fetal Neonatal Ed., November 1, 2002; 87(3): F165 - 171. [Abstract] [Full Text] [PDF] |
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S. A. Huang, S. A. Fish, D. M. Dorfman, D. Salvatore, H. P. W. Kozakewich, S. J. Mandel, and P. R. Larsen A 21-Year-Old Woman with Consumptive Hypothyroidism due to a Vascular Tumor Expressing Type 3 Iodothyronine Deiodinase J. Clin. Endocrinol. Metab., October 1, 2002; 87(10): 4457 - 4461. [Abstract] [Full Text] [PDF] |
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R. M. Calvo, E. Jauniaux, B. Gulbis, M. Asuncion, C. Gervy, B. Contempre, and G. Morreale de Escobar Fetal Tissues Are Exposed to Biologically Relevant Free Thyroxine Concentrations during Early Phases of Development J. Clin. Endocrinol. Metab., April 1, 2002; 87(4): 1768 - 1777. [Abstract] [Full Text] [PDF] |
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A. C. Bianco, D. Salvatore, B. Gereben, M. J. Berry, and P. R. Larsen Biochemistry, Cellular and Molecular Biology, and Physiological Roles of the Iodothyronine Selenodeiodinases Endocr. Rev., February 1, 2002; 23(1): 38 - 89. [Abstract] [Full Text] [PDF] |
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J.-P. Chanoine, J. Nève, S. Wu, J. Vanderpas, and P. Bourdoux Selenium Decreases Thyroglobulin Concentrations But Does Not Affect the Increased Thyroxine-to-Triiodothyronine Ratio in Children with Congenital Hypothyroidism J. Clin. Endocrinol. Metab., March 1, 2001; 86(3): 1160 - 1163. [Abstract] [Full Text] |
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G. Morreale de Escobar, M. Jesús Obregón, and F. Escobar del Rey Is Neuropsychological Development Related to Maternal Hypothyroidism or to Maternal Hypothyroxinemia? J. Clin. Endocrinol. Metab., November 1, 2000; 85(11): 3975 - 3987. [Abstract] [Full Text] |
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A. G. van Wassenaer and J. H. Kok Thyroid Function and Thyroid Hormone Requirements of Very Preterm Infants NeoReviews, June 1, 2000; 1(6): e116 - 121. [Full Text] |
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J. P. Sanders, S. Van der Geyten, E. Kaptein, V. M. Darras, E. R. Kühn, J. L. Leonard, and T. J. Visser Cloning and Characterization of Type III Iodothyronine Deiodinase from the Fish Oreochromis niloticus Endocrinology, August 1, 1999; 140(8): 3666 - 3673. [Abstract] [Full Text] |
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