The glycosylphosphatidylinositol-anchored CD59 protein stimulates both T cell receptor zeta/ZAP-70-dependent and -independent signaling pathways in T cells

European Journal of Immunology
M DeckertA M Bernard

Abstract

The glycosylphosphatidylinositol (GPI)-anchored CD59 protein (human protectin) protects cells against complement-induced lysis, binds to CD2 and also transduces activation signals within T cells. We have further examined the biochemical signals transduced by CD59 and addressed its role in regard to the CD3-mediated signaling cascade. We show here that CD59 cross-linking induces a time-dependent activation of p56lck and of p70zap (ZAP-70) in CD3-positive Jurkat cells, leading to the stimulation of the T cell receptor zeta/ZAP-70 signaling cascade and interleukin-2 (IL-2) synthesis. Cross-linking of CD59 on peripheral T cells and thymocytes induces tyrosine phosphorylations identical to those seen in Jurkat cells and this is followed by lymphokine production and proliferation. In contrast, only activation of CD59-associated p56lck occurs in CD3-negative Jurkat cells, while IL-2 production is impaired, consistent with the lack of ZAP-70 tyrosine phosphorylation observed in these cells. CD59 triggers activation events even in the absence of CD3/T cell receptor expression in Jurkat cells. CD59 cross-linking synergizes with sub-optimal doses of phorbol ester for activation of the protein kinase C and of the p42mapk, as shown by in vi...Continue Reading

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