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Plasma levels of selenium-containing proteins in Inuit adults from Nunavik.

https://arctichealth.org/en/permalink/ahliterature290755
Source
Environmental International. 2016 11; 96:8-15
Publication Type
Journal Article
Research Support, Non-U.S. Gov't
Date
11-2016
Author
Adel Achouba
Pierre Dumas
Nathalie Ouellet
Mélanie Lemire
Pierre Ayotte
Author Affiliation
Axe santé des Populations et Pratiques Optimales en Santé, Centre de Recherche du CHU de Québec, Hôpital du Saint-Sacrement, 1050, chemin Sainte-Foy, Québec, QC G1S 4L8, Canada.
Source
Environmental International. 2016 11; 96:8-15
Date
11-2016
Language
English
Geographic Location
Canada
Publication Type
Journal Article
Research Support, Non-U.S. Gov't
Keywords
Adult
Arctic Regions
Health Surveys
Humans
Inuits - statistics & numerical data
Quebec - epidemiology
Selenium - blood
Selenoproteins - blood
Abstract
Selenium (Se) is highly abundant in marine foods traditionally consumed by Inuit of Nunavik (Northern Quebec, Canada) and accordingly, their Se intake is among the highest in the world. However, little is known regarding the biological implications of this high Se status in this Arctic indigenous population. We used a method combining affinity chromatography and inductively coupled plasma-mass spectrometry with quantification by post-column isotope dilution to determine total Se levels and concentrations of Se-containing proteins in archived plasma samples of Inuit adults who participated to the 2004 Nunavik Inuit Health Survey (N = 852). Amounts of mercury (Hg) associated with Se-containing proteins were also quantified. Results show that glutathione peroxidase 3 (GPx3), selenoprotein P (SelP) and selenoalbumin (SeAlb) represented respectively 25%, 52% and 23% of total plasma Se concentrations. In addition, small amounts of Hg co-eluted with each Se-containing protein and up to 50% of plasma Hg was associated to SelP. Total plasma Se concentrations (median = 139 µg L- 1; interquartile range (IQR) = 22.7 µg L- 1) were markedly lower and less variable than whole blood Se concentration (median = 261 µg L- 1, IQR = 166 µg L- 1). A non linear relation was observed between whole blood Se and plasma Se levels, with plasma Se concentrations leveling off at approximately 200 µg L- 1, whereas 16% and 3% of individuals exhibited whole blood concentrations higher than 500 µg L- 1 and 1000 µg L- 1, respectively. In contrast, a linear relationship was previously reported in communities consuming Brazil nuts which are rich Se, mainly present as selenomethionine. This suggests that a different selenocompound, possibly selenoneine, is present in the Arctic marine food chain and accumulates in the blood cellular fraction of Inuit.
PubMed ID
27588697 View in PubMed
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