The sodium‐iodide symporter expression in placental tissue at different gestational age: an immunohistochemical study

Background  Iodide (I−) is crucial for foetal thyroid function. Foetal iodide results from maternal circulating iodide and from deiodination of iodothyronines within the placenta. The Na+/I− symporter (NIS) localized in placental cells appears to be involved in iodide exchange. Low NIS expression has been reported in trophoblast cells from the first trimester and pregnancy at term.

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