A human hybridoma monoclonal antibody (TrJ11) recognizing a new HLA-DR epitope shared by DR4, DR8, DR11, and DRB1*1303.
The cytotoxic IgM lambda human hybridoma mAb TrJ11 reacts with lymphoblastoid B-cell lines expressing DR4, DR8, DR11, and DRB1*1303. However, TrJ11 was monospecific when normal B cells freshly isolated from blood served as targets in that it only killed HLA-DR4-positive cells. Thus, of 235 HLA-typed persons TrJ11 was strongly cytotoxic for normal B cells of all 90 DR4-positive individuals, but it did not react with B cells from any of the 145 DR4-negative donors. Hence, mAb TrJ11 proved to be suitable for routine DR4 typing. The specific binding of TrJ11 to a DR4-positive cell line was profoundly blocked by the mouse HLA-DR beta chain-specific monomorphic mAb TAL 14.1, indicating that the epitope recognized by TrJ11 is located in the DR beta chain. The possibility that amino acids located in the floor of the peptide-binding site are critical for the TrJ11 epitope is discussed.
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J
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Department of Immunology, University of Tromsø, School of Medicine, Norway.
Bratlie
A
A
Hannestad
K
K
D000483:Alleles; D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology*; D001327:Autoimmune Diseases / Q000235:genetics / Q000276:immunology; D001402:B-Lymphocytes / Q000276:immunology; D002461:Cell Line, Transformed; D004198:Disease Susceptibility / Q000276:immunology; D000939:Epitopes / Q000276:immunology*; D020022:Genetic Predisposition to Disease; D006684:HLA-DR Antigens / Q000235:genetics / Q000276:immunology*; D059810:HLA-DR Serological Subtypes; D015804:HLA-DR4 Antigen / Q000276:immunology; D059811:HLA-DRB1 Chains; D006801:Humans; D006825:Hybridomas / Q000276:immunology*; D007075:Immunoglobulin M / Q000276:immunology*; D051379:Mice
D000911:Antibodies, Monoclonal; D000939:Epitopes; D006684:HLA-DR Antigens; D059810:HLA-DR Serological Subtypes; C080766:HLA-DR11 antigen; D015804:HLA-DR4 Antigen; C041559:HLA-DR8 antigen; D059811:HLA-DRB1 Chains; D007075:Immunoglobulin M