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Aging is associated with decreased expansion of T cells upon stimulation. In young mice, infection induces a transient T cell depletion followed by the development of an Ag-specific T cell response that controls the infection. We found that T cells were depleted early after infection with E55 + murine leukemia retrovirus in young, but not aged, mice. Adoptive transfer experiments showed donor T cells of young, but not aged, mice were depleted due to apoptosis in various tissues of young recipients. However, T cells of neither young nor aged donors were depleted in aged recipients. These results indicate that both environmental and intrinsic cellular properties limit depletion of T cells of aged mice and suggest a novel explanation for the decreased T cell response associated with aging.

Cutting Edge: T Cells from Aged Mice Are Resistant to Depletion Early During Virus Infection