Does the IL-2 receptor alpha chain induced on dendritic cells have a biological function?

International Immunology
V KroninK Shortman

Abstract

The IL-2 receptor (IL-2R) alpha chain (CD25), but not the IL-2R beta chain, is induced on dendritic cells (DC) by brief periods of culture. To test if this IL-2R alpha is important for DC function, DC were isolated from the spleens of mutant mice with the IL-2R alpha gene disrupted and compared with normal DC for ability to stimulate proliferation of allogeneic CD4 and CD8 T cells in culture. The IL-2R alpha null DC and the normal DC produced nearly identical proliferative responses from CD4 and from CD8 T cells. When the CD8 alpha+ and CD8 alpha- subsets of the IL-2R alpha null DC were separated, they also produced proliferative responses similar to that of their normal DC counterparts. Overall there was no evidence that the inducible IL-2R alpha on DC was required for DC development, for stimulation of T cells or for regulation of T cell responses.

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