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Published in: Immunity & Ageing 1/2022

Open Access 01-12-2022 | Cytokines | Research

Impaired JAK-STAT pathway signaling in leukocytes of the frail elderly

Authors: Leonard Daniël Samson, Peter Engelfriet, W. M. Monique Verschuren, H. Susan J. Picavet, José A. Ferreira, Mary-lène de Zeeuw-Brouwer, Anne-Marie Buisman, A. Mieke H. Boots

Published in: Immunity & Ageing | Issue 1/2022

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Abstract

Background

Elderly often show reduced immune functioning and can develop chronic low-grade inflammation. Why some elderly are more prone to become frail is unknown. We investigated whether frailty is associated with altered cytokine signaling through the JAK-STAT pathway in leukocytes of 34 individuals aged 65–74 years. In addition, we investigated how this relation is affected by chronic low-grade inflammation during the previous 20 years. Cytokine signaling was quantified by measuring intracellular STAT1, STAT3, and STAT5 phosphorylation in monocytes, B cells, CD4+ T cells and CD8+ T cells upon stimulation with IL-2, IL-6, IL-10, IFNα and IFNγ, using phospho-flow cytometry. Presence of chronic low-grade inflammation was investigated by evaluating 18 different plasma inflammatory markers that had been measured repeatedly in the same individuals over the previous 20 years. Frailty was assessed as a score on a frailty index.

Results

We found that lower cytokine-induced pSTAT responsiveness in the various cell subsets was seen with higher frailty scores in both men and women, indicative of dysfunctional pSTAT responses in frailer individuals. Associations differed between men and women, with frailer women showing lower pSTAT1 responses in monocytes and frailer men showing lower pSTAT5 responses in CD4+ and CD8+ T cells. Notably, lower IL-10-induced pSTAT3 responses in men were related to both higher frailty scores and higher CRP levels over the past 20 years. This might indicate poor resolution of low-grade inflammation due to defective regulatory pSTAT signaling in older men.

Conclusions

Our results emphasize the importance of preserved JAK-STAT pathway signaling in healthy aging and reveal cellular pSTAT levels as a candidate biomarker of frailty.
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Metadata
Title
Impaired JAK-STAT pathway signaling in leukocytes of the frail elderly
Authors
Leonard Daniël Samson
Peter Engelfriet
W. M. Monique Verschuren
H. Susan J. Picavet
José A. Ferreira
Mary-lène de Zeeuw-Brouwer
Anne-Marie Buisman
A. Mieke H. Boots
Publication date
01-12-2022
Publisher
BioMed Central
Keyword
Cytokines
Published in
Immunity & Ageing / Issue 1/2022
Electronic ISSN: 1742-4933
DOI
https://doi.org/10.1186/s12979-021-00261-w

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