An extremely high dietary iodide supply forestalls severe hypothyroidism in Na(+)/I(-) symporter (NIS) knockout mice.

An extremely high dietary iodide supply forestalls severe hypothyroidism in Na(+)/I(-) symporter (NIS) knockout mice.
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DOI:
10.1038/s41598-017-04326-z
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发表时间:
2017-07-13
期刊:
影响因子:
4.6
通讯作者:
Carrasco N
Carrasco N
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Ferrandino G;Kaspari RR;Reyna-Neyra A;Boutagy NE;Sinusas AJ;Carrasco N

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钠/碘同调体(NIS)在甲状腺中介导活性碘(I−)的积累,这是甲状腺激素(TH)生物合成的第一步。编码NIS的SLC5A5基因突变导致无功能蛋白,导致I -转运缺陷(ITD)导致先天性甲状腺功能减退。ITD是一种罕见的常染色体疾病,如果在婴儿期不及时治疗,可能会导致智力迟钝,因为TH减少会导致神经系统发育不正常。然而,在一些患者中,通过异常大量的膳食I -可以改善甲状腺功能减退。在这里,我们报告了第一个NIS敲除(KO)小鼠模型,通过靶向Slc5a5基因的6和7外显子获得。在NIS KO小鼠中,在甲状腺、胃和唾液腺中不存在NIS,因此没有NIS底物高技术酸盐(99mTcO4−)的主动积累。NIS KO小鼠在饲喂啮齿类动物最低I -需取量的日粮时,血清T4水平检测不到,T3水平非常低。这些甲状腺功能低下的小鼠在甲状腺中表现出氧化应激,但在棕色脂肪组织或肝脏中没有。给小鼠喂食高I -的食物部分地恢复了TH的生物合成,这表明,在高I -浓度下,I -通过NIS以外的途径进入甲状腺。
The sodium/iodide symporter (NIS) mediates active iodide (I−) accumulation in the thyroid, the first step in thyroid hormone (TH) biosynthesis. Mutations in the SLC5A5 gene encoding NIS that result in a non-functional protein lead to congenital hypothyroidism due to I− transport defect (ITD). ITD is a rare autosomal disorder that, if not treated promptly in infancy, can cause mental retardation, as the TH decrease results in improper development of the nervous system. However, in some patients, hypothyroidism has been ameliorated by unusually large amounts of dietary I−. Here we report the first NIS knockout (KO) mouse model, obtained by targeting exons 6 and 7 of the Slc5a5 gene. In NIS KO mice, in the thyroid, stomach, and salivary gland, NIS is absent, and hence there is no active accumulation of the NIS substrate pertechnetate (99mTcO4 −). NIS KO mice showed undetectable serum T4 and very low serum T3 levels when fed a diet supplying the minimum I− requirement for rodents. These hypothyroid mice displayed oxidative stress in the thyroid, but not in the brown adipose tissue or liver. Feeding the mice a high-I− diet partially rescued TH biosynthesis, demonstrating that, at high I− concentrations, I− enters the thyroid through routes other than NIS.
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发表时间: 2012-01-01
影响因子: 5.5
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发表时间: 2007-08-31
影响因子: 4.8
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发表时间: 1998-08-28
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