Plasma mineral (Se, Zn or Cu) concentrations in the general pregnant population, adjusted for supplement intake, in relation to thyroid function

Pop, Victor, Krabbe, Johannes, Maret, Wolfgang and Rayman, Margaret (2020) Plasma mineral (Se, Zn or Cu) concentrations in the general pregnant population, adjusted for supplement intake, in relation to thyroid function British Journal of Nutrition. pp. 1-23.

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Abstract

The current study reports on first-trimester reference ranges of plasma mineral Se/Zn/Cu concentration in relation to free thyroxine (FT4), thyrotropin (TSH) and thyroid peroxidase antibodies (TPO-Ab), assessed at 12 weeks’ gestation in 2041 pregnant women, including 544 women not taking supplements containing Se/Zn/Cu. The reference range (2.5th – 97.5th percentiles) in these 544 women was 0.72 – 1.25 μmol/L for Se, 17.15 – 35.98 μmol/L for Cu, and 9.57 – 16.41 μmol/L for Zn. These women had significantly lower mean plasma Se concentration (0.94 μmol/L, SD 0.12) than those (N = 1479) taking Se/Zn/Cu supplements (1.03 μmol/L, SD, 0.14; P < 0.001) while the mean Cu (26.25 μmol/L) and Zn (12.55 μmol/L) concentrations were almost identical in these sub-groups. Women with hypothyroxinemia (FT4 below reference range with normal TSH) had significantly lower plasma Zn concentrations than euthyroid women. After adjusting for co-variates including supplement intake, plasma Se (negatively), Zn and Cu (positively) concentrations were significantly related to logFT4; Se and Cu (but not Zn) were positively and significantly related to logTSH. Women taking additional Se/Zn/Cu supplements were 1.46 (95% CI: 1.09 – 2.04) times less likely to have elevated titres of TPO-Ab at 12 weeks of gestation. We conclude that first-trimester Se reference ranges are influenced by Se-supplement intake while Cu and Zn ranges are not. Plasma mineral Se/Zn/Cu concentration are associated with thyroid FT4 and TSH concentrations. Se/Zn/Cu supplement intake affects TPO-Ab status. Future research should focus on the impact of trace-mineral status during gestation on thyroid function.

Item Type:	Article
Divisions :	Faculty of Health and Medical Sciences > School of Biosciences and Medicine
Authors :	Name Email ORCID Pop, Victor Krabbe, Johannes Maret, Wolfgang w.maret@surrey.ac.uk Rayman, Margaret M.Rayman@surrey.ac.uk
Date :	14 July 2020
DOI :	10.1017/S000711452000255X
Copyright Disclaimer :	© The Authors 2020
Uncontrolled Keywords :	Selenium, copper, zinc, pregnancy, thyroid function
Additional Information :	Embargo OK Metadata Pending Version online is the proof version. Final version forthcoming.
Depositing User :	James Marshall
Date Deposited :	15 Jul 2020 12:17
Last Modified :	15 Jul 2020 12:17
URI:	http://epubs.surrey.ac.uk/id/eprint/858214

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