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Sivasankar, Baalasubramanian; Longhi, M Paula; Gallagher, Kathleen M E; Betts, Gareth J; Morgan, B Paul; Godkin, Andrew J; Gallimore, Awen M
The Journal of immunology (1950), 2009-May-01, Volume: 182, Issue: 9Journal Article
CD59, a broadly expressed GPI-anchored molecule, regulates formation of the membrane attack complex of the complement cascade. We previously demonstrated that mouse CD59 also down-modulates CD4(+) T cell activity in vivo. In this study, we explored the role of CD59 on human CD4(+) T cells. Our data demonstrate that CD59 is up-regulated on activated CD4(+) T cells and serves to down-modulate their activity in response to polyclonal and Ag-specific stimulation. The therapeutic potential of this finding was explored using T cells isolated from colorectal cancer patients. The findings were striking and indicated that blockade of CD59 significantly enhanced the CD4(+) T cell response to two different tumor Ags. These data highlight the potential for manipulating CD59 expression on T cells for boosting weak immune responses, such as those found in individuals with cancer.
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