Differential contributions of the glycosylphosphatidylinositol (GPI)-anchor and GPI-anchored proteins (GPI-AP) to signalling remain poorly understood. Here we show that GPI-AP deficient murine clones produce on average 18 and 181-fold more IL-2 mRNA and protein, respectively, upon T cell receptor (TCR) stimulation, in a cell-intrinsic fashion. This phenotype is formally attributed to a mutation within the transferase complex that predicates the initial step in GPI-anchor biosynthesis. Conditional disruption of the transferase complex enabled the generation of primary GPI-AP deficient CD4+ T cells, which produce on average 10- and 23-fold more IL-2 mRNA and protein, respectively, upon TCR stimulation. Conditional disruption of the transamidase complex yields GPI-sufficient, GPI-AP deficient primary CD4+ T cells. TCR stimulation of these cells yields levels of IL-2 mRNA and protein ranging from 1 - 3 and 3-fold, respectively, of controls. These results provide the first evidence of a profound impact of GPI in the regulation of TCR signalling.
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