Immunologic Research

, Volume 58, Issue 2–3, pp 224–233 | Cite as

Effects of serum and plasma matrices on multiplex immunoassays

  • Yael Rosenberg-Hasson
  • Leo Hansmann
  • Michaela Liedtke
  • Iris Herschmann
  • Holden T. Maecker
IMMUNOLOGY AT STANFORD UNIVERSITY

Abstract

Multiplexed fluorescence or electrochemiluminescence immunoassays of soluble cytokines are commonly performed in the context of human serum or plasma, to look for disease biomarkers and to monitor the immune system in a simple and minimally invasive way. These assays provide challenges due to the complexities of the matrix (serum or plasma) and the presence of many cytokines near the limit of detection of the assay. Here, we compare the readout of matched serum and plasma samples, which are generally correlated. However, a subset of cytokines usually have higher levels in serum, and the non-specific background is significantly increased in serum versus plasma. Presumably as a result of this non-specific background, disease-related decreases in low-abundance cytokines can sometimes be detected in plasma but not in serum. We further show, through spike recovery experiments, that both serum and plasma inhibit the readout of many cytokines, with some variability between donors, but with serum causing greater inhibition than plasma in many cases. Standard diluents from different vendors can partially reverse this inhibition to varying degrees. Dilution of samples can also partly overcome the inhibitory effect of the matrix. We also show that dilution is nonlinear and differentially affects various cytokines. Together, these data argue that (1) plasma is a more sensitive matrix for detecting changes in certain low-abundance cytokines; (2) calculation of concentrations in serum or plasma matrices is inherently inaccurate; and (3) dilution of samples should not be assumed to be linear, i.e., all comparisons need to be made among similarly diluted samples.

Keywords

Luminex Immunoassay Serum Plasma Cytokine 

Notes

Acknowledgments

This study was supported by Grants 5U19AI057229 and 5U19AI090019 from the NIAID, NIH. Leo Hansmann is supported by a research fellowship from the German Research Foundation (DFG). We thank Cindy Huynh for technical services.

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Yael Rosenberg-Hasson
    • 1
  • Leo Hansmann
    • 2
  • Michaela Liedtke
    • 3
  • Iris Herschmann
    • 1
  • Holden T. Maecker
    • 1
    • 2
  1. 1.Institute for Immunity, Transplantation, and InfectionStanford University School of MedicineStanfordUSA
  2. 2.Department of Microbiology and ImmunologyStanford University School of MedicineStanfordUSA
  3. 3.Division of Hematology, Department of MedicineStanford University School of MedicineStanfordUSA

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