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Rancan, C. ; Schirrmann, L. ; Hüls, C. ; Zeidler, R. ; Moosmann, A.

Latent membrane protein LMP2A impairs recognition of EBV-infected cells by CD8+ T cells.

PLoS Pathog. 11:e1004906 (2015)
Publ. Version/Full Text DOI PMC
Open Access Gold
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The common pathogen Epstein-Barr virus (EBV) transforms normal human B cells and can cause cancer. Latent membrane protein 2A (LMP2A) of EBV supports activation and proliferation of infected B cells and is expressed in many types of EBV-associated cancer. It is not clear how latent EBV infection and cancer escape elimination by host immunity, and it is unknown whether LMP2A can influence the interaction of EBV-infected cells with the immune system. We infected primary B cells with EBV deleted for LMP2A, and established lymphoblastoid cell lines (LCLs). We found that CD8+ T cell clones showed higher reactivity against LMP2A-deficient LCLs compared to LCLs infected with complete EBV. We identified several potential mediators of this immunomodulatory effect. In the absence of LMP2A, expression of some EBV latent antigens was elevated, and cell surface expression of MHC class I was marginally increased. LMP2A-deficient LCLs produced lower amounts of IL-10, although this did not directly affect CD8+ T cell recognition. Deletion of LMP2A led to several changes in the cell surface immunophenotype of LCLs. Specifically, the agonistic NKG2D ligands MICA and ULBP4 were increased. Blocking experiments showed that NKG2D activation contributed to LCL recognition by CD8+ T cell clones. Our results demonstrate that LMP2A reduces the reactivity of CD8+ T cells against EBV-infected cells, and we identify several relevant mechanisms.
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Publication type Article: Journal article
Document type Scientific Article
Corresponding Author
Keywords Epstein-barr-virus; Hla-class-i; Bovine Leukemia-virus; Cytotoxic T-cells; Nuclear Antigen 1; B-cells; Growth Transformation; Burkitts-lymphoma; Regulates Reactivation; Encoded Interleukin-10
ISSN (print) / ISBN 1553-7366
e-ISSN 1553-7374
Journal PLoS Pathogens
Quellenangaben Volume: 11, Issue: 6, Pages: , Article Number: e1004906 Supplement: ,
Publisher Public Library of Science (PLoS)
Publishing Place San Francisco
Non-patent literature Publications
Reviewing status Peer reviewed
Institute(s) Research Unit Gene Vector (AGV)
CCG Immunooncology (AGV-KIO)