[HTML][HTML] TCR–like antibodies mediate complement and antibody-dependent cellular cytotoxicity against Epstein-Barr virus–transformed B lymphoblastoid cells …

J Lai, JAL Choo, WJ Tan, CT Too, MZ Oo, MA Suter… - Scientific Reports, 2017 - nature.com
J Lai, JAL Choo, WJ Tan, CT Too, MZ Oo, MA Suter, FB Mustafa, N Srinivasan, CEZ Chan
Scientific Reports, 2017nature.com
Epstein-Barr virus (EBV) is a common gammaherpesvirus associated with various human
malignancies. Antibodies with T cell receptor-like specificities (TCR-like mAbs) provide a
means to target intracellular tumor-or virus-associated antigens by recognising their
processed peptides presented on major histocompatibility complex (MHC) class I (pMHC)
complexes. These antibodies are however thought to be relevant only for a single HLA
allele. Here, we show that HLA-A* 02: 01-restricted EBV antigenic peptides EBNA1562-570 …
Abstract
Epstein-Barr virus (EBV) is a common gammaherpesvirus associated with various human malignancies. Antibodies with T cell receptor-like specificities (TCR-like mAbs) provide a means to target intracellular tumor- or virus-associated antigens by recognising their processed peptides presented on major histocompatibility complex (MHC) class I (pMHC) complexes. These antibodies are however thought to be relevant only for a single HLA allele. Here, we show that HLA-A*02:01-restricted EBV antigenic peptides EBNA1562-570, LMP1125-133 and LMP2A426-434 display binding degeneracy towards HLA-A*02 allelic microvariants, and that these pMHC complexes are recognised by anti-EBV TCR-like mAbs E1, L1 and L2 raised in the context of HLA-A*02:01. These antibodies bound endogenously derived pMHC targets on EBV–transformed human B lymphoblastoid cell lines expressing A*02:01, A*02:03, A*02:06 and A*02:07 alleles. More importantly, these TCR-like mAbs mediated both complement-dependent and antibody-dependent cellular cytotoxicity of these cell lines in vitro. This finding suggests the utility of TCR-like mAbs against target cells of closely related HLA subtypes, and the potential applicability of similar reagents within populations of diverse HLA-A*02 alleles.
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