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Variability of iodine concentrations in the human placenta.
Scientific Reports ( IF 3.8 ) Pub Date : 2020-01-13 , DOI: 10.1038/s41598-019-56775-3
Kristof Y Neven 1 , Cédric B D Marien 2 , Bram G Janssen 1 , Harry A Roels 1, 3 , Nadia Waegeneers 2 , Tim S Nawrot 1, 4 , Ann Ruttens 2
Affiliation  

Iodine is an essential trace element, necessary for the production of thyroid hormones, which play a key role in optimal foetal growth and (neuro-) development. To date, iodine deficiency remains a health burden in many countries. We investigated the variability of placental iodine concentrations within and between individuals. We used 20 mother-neonate pairs from the ENVIRONAGE birth cohort, took samples at three standardized locations of the placentas, pooled and digested them, and determined the iodine concentrations using an ICP-MS method as an alternative for the Sandell-Kolthoff method. The variability between and within the three sample regions was calculated using the intra-class correlation coefficient (ICC) from the variance components of mixed models. With the Friedman test, the differences between placental biopsies were assessed. The ICC showed a higher between-placenta (68.6%) than within-placenta (31.4%) variability. Subsequently, we used our optimized method to determine iodine concentrations in 498 mother-neonate pairs, which averaged 26.1 μg/kg. For 96 mothers, the urinary iodine concentrations were also determined, which showed no correlation with the placental iodine storage, as was expected. Future studies are necessary to explore the effects of these placental iodine concentrations in relation to health outcomes of mother and child at birth and later in life.

中文翻译:

人胎盘中碘浓度的变化。

碘是必需的微量元素,是产生甲状腺激素所必需的,甲状腺素在最佳胎儿生长和(神经)发育中起关键作用。迄今为止,碘缺乏症仍然是许多国家的健康负担。我们调查了个体内部和个体之间胎盘碘浓度的变异性。我们使用了来自环境出生队列的20对新生儿新生儿,在胎盘的三个标准化位置取样,合并并消化,并使用ICP-MS方法(作为Sandell-Kolthoff方法的替代方法)确定了碘浓度。使用类别内相关系数(ICC)从混合模型的方差分量中计算出三个样本区域之间和之内的变异性。用弗里德曼检验,评估胎盘活检之间的差异。ICC的胎盘间差异(68.6%)高于胎盘内差异(31.4%)。随后,我们使用优化的方法确定了498对新新生儿母亲中的碘浓度,平均为26.1μg/ kg。对于96名母亲,还测定了尿中的碘浓度,这与预期的胎盘碘储存量无关。有必要进行进一步的研究,以探讨这些胎盘碘浓度对母子在出生时和生命中的健康结局的影响。如所预期的,其与胎盘碘的储存没有相关性。有必要进行进一步的研究,以探讨这些胎盘碘浓度对母子在出生时和生命后期的健康结局的影响。如所预期的,其与胎盘碘的储存没有相关性。有必要进行进一步的研究,以探讨这些胎盘碘浓度对母子在出生时和生命中的健康结局的影响。
更新日期:2020-01-13
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