An intense form of homeostatic proliferation of naive CD8+ cells driven by IL-2
In conditions of T lymphopenia, interleukin (IL) 7 levels rise and, via T cell receptor for antigen-self-major histocompatibility complex (MHC) interaction, induce residual naive T cells to proliferate. This pattern of lymphopenia-induced "homeostatic" proliferation is typically quite slow and causes a gradual increase in total T cell numbers and differentiation into cells with features of memory cells. In contrast, we describe a novel form of homeostatic proliferation that occurs when naive T cells encounter raised levels of IL-2 and IL-15 in vivo. In this situation, CD8(+) T cells undergo massive expansion and rapid differentiation into effector cells, thus closely resembling the T cell response to foreign antigens. However, the responses induced by IL-2/IL-15 are not seen in MHC-deficient hosts, implying that the responses are driven by self-ligands. Hence, homeostatic proliferation of naive T cells can be either slow or fast, with the quality of the response to self being dictated by the particular cytokine (IL-7 vs. IL-2/IL-15) concerned. The relevance of the data to the gradual transition of naive T cells into memory-phenotype (MP) cells with age is discussed.
|Authors||Cho, J. H.;Boyman, O.;Kim, H. O.;Hahm, B.;Rubinstein, M. P.;Ramsey, C.;Kim, D. M.;Surh, C. D.;Sprent, J. :|
|Publisher Name||J EXP MED|
|Published Date||2007-01-01 00:00:00|
|OpenAccess Link||https://publications.gimr.garvan.org.au/download.php?2183_10919/07 Cho JEM.pdf|