4.5 Article

Thyroid hormone transport and metabolism by organic anion transporter 1C1 and consequences of genetic variation

期刊

ENDOCRINOLOGY
卷 149, 期 10, 页码 5307-5314

出版社

ENDOCRINE SOC
DOI: 10.1210/en.2008-0430

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资金

  1. The Netherlands Organization of Scientific Research Institute for Diseases [6730040]
  2. Danish Research Agency [014-93-015]
  3. Agnes and Knut Mork Foundation [17-12-1981]
  4. Novo Nordisk Foundation
  5. Foundation of Medical Research in the County of Funen
  6. Else Poulsens Mindelegat
  7. Foundation of Direktor Jacob Madsen and Hustru Olga Madsen
  8. Foundation of Johan Boserup and Lise Boserup
  9. A. P. Moller and Hustru Chastine McKinney Mollers Foundation
  10. A. P. Moller Relief Foundation
  11. Clinical Research Institute, Odense University

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Organic anion transporting polypeptide (OATP) 1C1 has been characterized as a specific thyroid hormone transporter. Based on its expression in capillaries in different brain regions, OATP1C1 is thought to play a key role in transporting thyroid hormone across the blood-brain barrier. For this reason, we studied the specificity of iodothyronine transport by OATP1C1 in detail by analysis of thyroid hormone uptake in OATP1C1-transfected COS1 cells. Furthermore, we examined whether OATP1C1 is rate limiting in subsequent thyroid hormone metabolism in cells cotransfected with deiodinases. We also studied the effect of genetic variation in the OATP1C1 gene: polymorphisms were determined in 155 blood donors and 1192 Danish twins and related to serum thyroid hormone levels. In vitro effects of the polymorphisms were analyzed in cells transfected with the variants. Cells transfected with OATP1C1 showed increased transport of T-4 and T-4 sulfate (T4S), little transport of rT(3), and no transport of T-3 or T-3 sulphate, compared with mock transfected cells. Metabolism of T-4, T4S, and rT(3) by cotransfected deiodinases was greatly augmented in the presence of OATP1C1. The OATP1C1-intron3C > T, Pro143Thr, and C3035T polymorphisms were not consistently associated with thyroid hormone levels, nor did they affect transport function in vitro. In conclusion, OATP1C1 mediates transport of T4, T4S, and rT3 and increases the access of these substrates to the intracellular active sites of the deiodinases. No effect of genetic variation on the function of OATP1C1 was observed.

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