Systematic name M3321
Brief description Genes up-regulated in comparison of resting CD4 [GeneID=920] T cells versus bystander activated CD4 [GeneID=920] T cells.
Full description or abstract There is much evidence that T cells may be activated via mechanisms which act independently of direct TCR ligation. Despite this, the question of whether such forms of ?bystander? T cell activation occur during immune responses is hotly debated. To address some outstanding questions, we set up an in vitro system within which to analyse bystander T cell activation in human T cells, in the absence of the possibility for TCR cross-reactivity. In addition, we have investigated the genetic, phenotypic, and functional characteristics of bystander activated T cells. Here, we show that bystander T cell activation is, indeed, observed during a specific immune response, and that it occurs preferentially amongst CD4+ memory T cells. Furthermore, bystander activated T cells display a distinct gene expression profile. The mechanism for bystander T cell activation involves soluble factors, and the outcome is an elevated level of apoptosis. This may provide an explanation for the attrition of T cell memory pools of heterologous specificity during immune responses to pathogens such as viruses.
Collection C7: Immunologic Signature
      IMMUNESIGDB: ImmuneSigDB
Source publication Pubmed 19201849   Authors: Bangs SC,Baban D,Cattan HJ,Li CK,McMichael AJ,Xu XN
Exact source GSE13738_1726_200_UP
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Source species Homo sapiens
Contributed by Jernej Godec (Dana-Farber Cancer Institute)
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Version history 7.3: Moved to ImmuneSigDB sub-collection.

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