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Article Dans Une Revue PLoS Biology Année : 2019

Cell generation dynamics underlying naïve T cell homeostasis in adult humans

Résumé

Thymic involution and proliferation of naive T cells both contribute to shaping the naive T-cell repertoire as humans age, but a clear understanding of the roles of each throughout a human life span has been difficult to determine. By measuring nuclear bomb test-derived 14 C in genomic DNA, we determined the turnover rates of CD4 + and CD8 + naive T-cell populations and defined their dynamics in healthy individuals ranging from 20 to 65 years of age. We demonstrate that naive T-cell generation decreases with age because of a combination of declining peripheral division and thymic production during adulthood. Concomitant decline in T-cell loss compensates for decreased generation rates. We investigated putative mechanisms underlying age-related changes in homeostatic regulation of CD4+ naive T-cell turnover, using mass cytometry to profile candidate signaling pathways involved in T-cell activation and proliferation relative to CD31 expression, a marker of thymic proximity for the CD4+ naive T-cell population. We show that basal nuclear factor κB (NF-κB) phosphory-lation positively correlated with CD31 expression and thus is decreased in peripherally expanded naive T-cell clones. Functionally, we found that NF-κB signaling was essential for naive T-cell proliferation to the homeostatic growth factor interleukin (IL)-7, and reduced NF-κB phosphorylation in CD4 + CD31 − naive T cells is linked to reduced homeostatic proliferation potential. Our results reveal an age-related decline in naive T-cell turnover as a putative regulator of naive T-cell diversity and identify a molecular pathway that restricts proliferation of peripherally expanded naive T-cell clones that accumulate with age.
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Dates et versions

hal-02160888 , version 1 (20-06-2019)
hal-02160888 , version 2 (31-10-2019)

Licence

Paternité - Pas d'utilisation commerciale - Pas de modification

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Jeff E. Mold, Pedro Réu, Axel Olin, Samuel Bernard, Jakob Michaelsson, et al.. Cell generation dynamics underlying naïve T cell homeostasis in adult humans. PLoS Biology, 2019, 17 (10), pp.e3000383. ⟨10.1371/journal.pbio.3000383⟩. ⟨hal-02160888v2⟩
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