Abstract
Fas antigen and Bcl-2 protein are considered to be involved in cellular homeostasis. We precisely analyzed the expression of human Fas antigen and Bcl-2 protein on CD4+ T cells, CD8+ T cells, and monocytes. The positivities of Fas antigen on CD4+ and CD8+ T cells increased with aging. In CD4+ T cells, the Fas-/CD45RO+ subpopulation was dominant compared with the Fas+/CD45RO- subpopulation. Conversely, in CD8+ T cells, the Fas+/CD45RO- subpopulation was dominant compared with the Fas-/CD45RO+ subpopulation. Monocytes exhibited high positivity of Fas antigen and low fluorescence intensity of Bcl-2 protein compared with T cells. These results suggest that Fas antigen acts in different processes of cellular homeostasis between CD4+ and CD8+ T cells and that expression of Fas antigen and Bcl-2 protein is involved in homeostasis of monocytes as well as lymphocytes.
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