Prediction of human iron bioavailability using rapid c-ELISAs for human plasma hepcidin
Abstract
Background:
Hepcidin is the central systemic regulator of iron metabolism, but its quantification in biological fluids is challenging. Rapid, accurate and user-friendly methods are needed. Our aim was to assess the ability of hepcidin as measured by three different c-ELISA assays to predict iron bioavailability in humans.
Methods:
The three assays used were commercially available DRG and Peninsula assays and the c-ELISA method performed at Radboud University Medical Centre, Nijmegen, The Netherlands (Hepcidinanalysis.com), validated by comparative measurements with time-of-flight mass spectrometry. We analyzed plasma samples (n=37) selected to represent a broad range of hepcidin concentrations from a subgroup of healthy, iron-depleted women in a study assessing fractional absorption from iron supplements.
Results:
In single regressions, all three c-ELISA assays were predictors of fractional iron absorption: R2=0.363 (DRG), R2=0.281 (Peninsula) and R2=0.327 (Hepcidinanalysis.com). In multiple regressions, models including hepcidin measured with either DRG-, Peninsula or Hepcidinanalysis.com explained 55.7%, 44.5% and 52.5% of variance in fractional absorption, and hepcidin was a strong predictor of fractional absorption irrespective of the hepcidin assays used. However, we found significant differences in absolute values for hepcidin between different methods. Both the DRG assay’s (y=0.61x+0.87; R2=0.873) and the Peninsula assay’s measurements (y=1.88x+0.62; R2=0.770) were correlated with Hepcidinanalysis.com.
Conclusions:
The biological variability in plasma hepcidin, (inter-sample CV) was 5–10-fold higher for both the Peninsula and DRG assay than the analytical variably (inter-run within-sample CV) suggesting substantial discriminatory power to distinguish biological hepcidin variation. Between methods, prediction of iron bioavailability in generally healthy iron depleted subjects appears comparable. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000233020Publication status
publishedExternal links
Journal / series
Clinical Chemistry and Laboratory MedicineVolume
Pages / Article No.
Publisher
De GruyterSubject
iron deficiency anemia; anemia of chronic disease; iron overload; hepcidin; iron absorptionOrganisational unit
03957 - Zimmermann, Michael Bruce (emeritus) / Zimmermann, Michael Bruce (emeritus)
Notes
It was possible to publish this article open access thanks to a Swiss National Licence with the publisher.More
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