The lymphopenic environment of CD132 (common gamma-chain)-deficient hosts elicits rapid homeostatic proliferation of naive T cells via IL-15
Homeostatic proliferation for naive T cells is observed readily only under lymphopenic conditions in response to elevated levels of IL-7 and contact with self-MHC/peptide ligands. Homeostatic proliferation occurs at a slow pace and gradually induces the dividing cells to acquire characteristics of memory cells. We describe a novel type of homeostatic proliferation whereby naive T cells proliferate at a significantly faster rate, resembling the proliferation speed induced by foreign Ags, and the expanding cells rapidly differentiate into central memory cells. Remarkably, such rapid homeostatic proliferation is driven by a combination of IL-2 and IL-15, with IL-15 playing a bigger role, and applies for a wide repertoire of CD8(+) naive T cells, including many TCR-transgenic lines, even those that fail to undergo IL-7-driven homeostatic proliferation. Thus, naive T cells can be induced to undergo homeostatic proliferation of variable speed with a few members of the common gamma-chain (CD132) family of cytokines, the speed of proliferation depending on the levels of the particular cytokine involved.
|Authors||Ramsey, C. Rubinstein, M. P. Kim, D. M. Cho, J. H. Sprent, J. Surh, C. D.|
|Publisher Name||J IMMUNOL|
|Published Date||2008-04-01 00:00:00|
|OpenAccess Link||https://publications.gimr.garvan.org.au/download.php?10063_10182/08 Ramsey JI 5320.pdf|