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- W2045419527 abstract "Activation induced cell death (AICD) is a major physiologic pathway that regulates T cell homeostasis. In CD4 T cells, AICD is mediated mainly through Fas/FasL interactions. Although TCR occupancy triggers AICD, the contribution of its tightly associated CD4 coreceptor to the process that leads to AICD is not known. Here we show that CD4 molecule plays an essential regulatory role of TCR dependent AICD. Loss of CD4 rendered activated 5kc T cell hybridoma resistant to AICD. The resistance of CD4 negative 5kc T cells to AICD was due to selective inhibition of FasL expression and it could be reversed by addition of recombinant FasL. Furthermore, a direct functional link between CD4 and FasL was demonstrated by induction of FasL upon CD4 crosslinking in a TCR independent fashion. The importance of CD4 interaction with MHC/peptide complex in mediating AICD was also evident in normal T cells that could survive chronic stimulation with anti-CD3 but died after short period of proliferation after stimulation with MHC/peptide. Thus it appears that AICD is controlled by the CD4 molecule via regulation of FasL expression. These findings have important implications for our understanding of mechanisms of peripheral tolerance as well as pathogenesis of autoimmune diseases." @default.
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- W2045419527 date "2001-01-01" @default.
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- W2045419527 title "Antigen-Induced T Cell Death Is Regulated by CD4 Expression" @default.
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- W2045419527 doi "https://doi.org/10.3109/08830180109045577" @default.
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