University of Sussex

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Cytomegalovirus infection induces the accumulation of short-lived, multifunctional CD4+CD45RA+CD27+ T cells: the potential involvement of interleukin-7 in this process

journal contribution
posted on 2023-06-08, 12:41 authored by V Libri, R I Azevedo, S E Jackson, D Di Mitri, R Lachmann, S Fuhrmann, M Vukmanovic-Stejic, K Yong, L Battistini, Florian KernFlorian Kern, M V Soares, A N Akbar
The relative roles that ageing and lifelong cytomegalovirus (CMV) infection have in shaping naive and memory CD4+ T-cell repertoires in healthy older people is unclear. Using multiple linear regression analysis we found that age itself is a stronger predictor than CMV seropositivity for the decrease in CD45RA+ CD27+ CD4+ T cells over time. In contrast, the increase in CD45RA(-) CD27(-) and CD45RA+ CD27(-) CD4+ T cells is almost exclusively the result of CMV seropositivity, with age alone having no significant effect. Furthermore, the majority of the CD45RA(-) CD27(-) and CD45RA+ CD27(-) CD4+ T cells in CMV-seropositive donors are specific for this virus. CD45RA+ CD27(-) CD4+ T cells have significantly reduced CD28, interleukin-7 receptor alpha (IL-7Ralpha) and Bcl-2 expression, Akt (ser473) phosphorylation and reduced ability to survive after T-cell receptor activation compared with the other T-cell subsets in the same donors. Despite this, the CD45RA+ CD27(-) subset is as multifunctional as the CD45RA(-) D27+ and CD45RA(-) CD27(-) CD4+ T-cell subsets, indicating that they are not an exhausted population. In addition, CD45RA+ CD27(-) CD4+ T cells have cytotoxic potential as they express high levels of granzyme B and perforin. CD4+ memory T cells re-expressing CD45RA can be generated from the CD45RA(-) CD27+ population by the addition of IL-7 and during this process these cells down-regulated expression of IL-7R and Bcl-2 and so resemble their counterparts in vivo. Finally we showed that the proportion of CD45RA+ CD27(-) CD4+ T cells of multiple specificities was significantly higher in the bone marrow than the blood of the same individuals, suggesting that this may be a site where these cells are generated.


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Blackwell Publishing





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  • Clinical and Experimental Medicine Publications

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