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CD8(+) CD45RA(+) CCR7(+) FOXP3(+) T Cells with Immunosuppressive Properties: A Novel Subset of Inducible Human Regulatory T Cells JOURNAL OF IMMUNOLOGY Suzuki, M., Jagger, A. L., Konya, C., Shimojima, Y., Pryshchep, S., Goronzy, J. J., Weyand, C. M. 2012; 189 (5): 2118-2130

Abstract

CD8 T cells stimulated with a suboptimal dose of anti-CD3 Abs (100 pg/ml) in the presence of IL-15 retain a naive phenotype with expression of CD45RA, CD28, CD27, and CCR7 but acquire new functions and differentiate into immunosuppressive T cells. CD8+CCR7+ regulatory T cells (Tregs) express FOXP3 and prevent CD4 T cells from responding to TCR stimulation and entering the cell cycle. Naive CD4 T cells are more susceptible to inhibition than memory cells. The suppressive activity of CD8+CCR7+ Tregs is not mediated by IL-10, TGF-ß, CTLA-4, CCL4, or adenosine and relies on interference with very early steps of the TCR signaling cascade. Specifically, CD8+CCR7+ Tregs prevent TCR-induced phosphorylation of ZAP70 and dampen the rise of intracellular calcium in CD4 T cells. The inducibility of CD8+CCR7+ Tregs is correlated with the age of the individual with PBLs of donors older than 60 y yielding low numbers of FOXP3(low) CD8 Tregs. Loss of CD8+CCR7+ Tregs in the elderly host may be of relevance in the aging immune system as immunosenescence is associated with a state of chronic smoldering inflammation.

View details for DOI 10.4049/jimmunol.1200122

View details for Web of Science ID 000308083600009

View details for PubMedID 22821963

View details for PubMedCentralID PMC3424334