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Expression of glycosylphosphatidylinositol-anchored CD59 on target cells enhances human NK cell-mediated cytotoxicity

Omidvar, Nader, Wang, Edward Chung Yern ORCID:, Brennan, Paul ORCID:, Longhi, Maria P., Smith, Richard A. G. and Morgan, Bryan Paul ORCID: 2006. Expression of glycosylphosphatidylinositol-anchored CD59 on target cells enhances human NK cell-mediated cytotoxicity. The Journal of Immunology 176 (5) , pp. 2915-2923. 10.4049/jimmunol.176.5.2915

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NK cell-mediated cytotoxicity of target cells is the result of a balance between the activating and inhibitory signals provided by their respective ligand-receptor interactions. In our current study, we have investigated the significance of CD59 on human target cells in modulating this process. A range of CD59 site-specific Abs were used in NK cytotoxicity blocking studies against the CD59-expressing K562 target cell line. Significantly reduced cytotoxicity was observed in the presence of Abs previously shown to lack blocking capacity for C-mediated lysis. We investigated the consequences for alternative membrane attachment modalities, namely bis-myristoylated-peptidyl (BiMP) and GPI anchoring, on CD59-negative U937 cells. Expression of GPI-anchored CD59 either via transfection or incorporation rendered U937 targets more susceptible to NK cytotoxicity, whereas incorporation of CD59 via a BiMP anchor to similar levels did not alter susceptibility to NK cytotoxicity. Localization of both BiMP- and GPI-anchored CD59 proteins was shown to be within the lipid raft microdomain. A role for the GPI anchor and independence from glycosylation status was confirmed by expression of transmembrane-anchored CD59 or unglycosylated CD59 and by testing in NK cytotoxicity assays. To investigate mechanisms, we compared the signaling capacity of the various forms of expressed and incorporated CD59 following Ab cross-linking in calcium flux assays. GPI-anchored CD59, with or without glycosylation, mediated activation events, whereas CD59 forms lacking the GPI anchor did not. The data show that the increased susceptibility of target cells expressing CD59 to NK cytotoxicity requires GPI anchor-mediating signaling events, likely mediated by interactions between GPI-anchored CD59 on targets and NK receptors.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Systems Immunity Research Institute (SIURI)
Subjects: R Medicine > R Medicine (General)
R Medicine > RZ Other systems of medicine
Additional Information: Publication Types Research Support, Non-U.S. Gov't Grant Support 068590/Wellcome Trust/United Kingdom G0300180/Medical Research Council/United Kingdom G0300180(65735)/Medical Research Council/United Kingdom G0500617/Medical Research Council/United Kingdom G0500617(74644)/Medical Research Council/United Kingdom Full Text Sources HighWire Europe PubMed Central - Author Manuscript PubMed Central - Author Manuscript PubMed Central Canada - Author Manuscript Other Literature Sources COS Scholar Universe Miscellaneous NCI CPTC Antibody Characterization Program
Publisher: American Association of Immunologists
ISSN: 0022-1767
Last Modified: 25 Oct 2022 09:53

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