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Variability of cytokine concentration in whole blood serum and bronchoalveolar lavage over time


Valaperti, Alan; Bezel, Pascal; Vonow-Eisenring, Maya; Franzen, Daniel; Steiner, Urs C (2019). Variability of cytokine concentration in whole blood serum and bronchoalveolar lavage over time. Cytokine, 123:154768.

Abstract

Measurement of cytokines in peripheral blood and bronchoalveolar lavage fluid (BALF) is a useful method to assess human immune responses in a large range of pulmonary diseases. One of the major pre-analytical challenges of cytokine analysis is the quality and stability of cytokines in the timeframe between sample collection and the separation of supernatant from cells.

To evaluate if the method of storage may affect cytokine quantification, whole blood and BALF were collected, aliquoted, and left at room temperature (RT) to be processed at different time points. In addition, sera and BALF were left either at RT or at 4 °C for 24 h after cell separation to test cytokine variations in the absence of cells. Samples were analysed by a multiple array containing ten cytokines.

Most of the cytokines analysed (interleukin (IL)-4, IL-5, IL-6, IL-12p70, IL-13, IL-17A, IL-23, interferon (IFN)-γ, and tumour necrosis factor (TNF)-α) did not show significant variations in whole blood and BALF. Levels of IL-8 however, increased after storage of whole blood and BALF for 24 h at RT. Ex vivo IL-8 production seems to correlate with higher numbers of macrophages in collected BALF.

These data demonstrate that many cytokines are stable for a brief time after sample collection. For IL-8, freshly collected whole blood and BALF should be quickly processed and frozen to avoid false positive results.

Abstract

Measurement of cytokines in peripheral blood and bronchoalveolar lavage fluid (BALF) is a useful method to assess human immune responses in a large range of pulmonary diseases. One of the major pre-analytical challenges of cytokine analysis is the quality and stability of cytokines in the timeframe between sample collection and the separation of supernatant from cells.

To evaluate if the method of storage may affect cytokine quantification, whole blood and BALF were collected, aliquoted, and left at room temperature (RT) to be processed at different time points. In addition, sera and BALF were left either at RT or at 4 °C for 24 h after cell separation to test cytokine variations in the absence of cells. Samples were analysed by a multiple array containing ten cytokines.

Most of the cytokines analysed (interleukin (IL)-4, IL-5, IL-6, IL-12p70, IL-13, IL-17A, IL-23, interferon (IFN)-γ, and tumour necrosis factor (TNF)-α) did not show significant variations in whole blood and BALF. Levels of IL-8 however, increased after storage of whole blood and BALF for 24 h at RT. Ex vivo IL-8 production seems to correlate with higher numbers of macrophages in collected BALF.

These data demonstrate that many cytokines are stable for a brief time after sample collection. For IL-8, freshly collected whole blood and BALF should be quickly processed and frozen to avoid false positive results.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Clinic for Immunology
04 Faculty of Medicine > University Hospital Zurich > Clinic for Pneumology
Dewey Decimal Classification:610 Medicine & health
Uncontrolled Keywords:Immunology, Immunology and Allergy, Biochemistry, Molecular Biology, Hematology
Language:English
Date:1 November 2019
Deposited On:14 Jan 2020 12:05
Last Modified:10 Feb 2020 15:44
Publisher:Elsevier
ISSN:1043-4666
OA Status:Closed
Publisher DOI:https://doi.org/10.1016/j.cyto.2019.154768
PubMed ID:31276936

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