A new supertypic HLA class II determinant (PL2) differentially expressed with DR7, DRw11(5), DRw13(w6), DRw14(w6), DR3, and DR2 and biochemically localized to DR7 molecules.
A monoclonal antibody, PL2, has been produced that reacts with a new supertypic determinant expressed on the peripheral blood B lymphocytes and B-leukemic cells (B-CLL) from all individuals who are HLA-DR7 and some individuals who are HLA-DR5 positive. The genetic linkage of the PL2 determinant to the HLA region was demonstrated by family segregation studies. When cultured Epstein-Barr virus (EBV) transformed B cell lines were examined, PL2 was again found to be expressed on all cell lines homozygous for HLA-DR7 and the DRw11(5) subtype of HLA-DR5 positive cells, while one DRw12(5) cell line was negative, suggesting PL2 may distinguish between these DR5 subtypes. In addition, using the panel of EBV-transformed B-cell lines, PL2 was also found to be weakly expressed on HLA-DRw14(w6), -DRw13(w6), -DR3, and -DR2 positive cells but was completely absent from HLA-DR1 and -DR4 positive cells, and is probably absent also from DRw8- and DRw10-positive cells. From titration analysis and quantitative absorption studies the PL2 determinant was found to be expressed at quantitatively different levels in the following order: DR7 greater than DRw11, DRw14 greater than DRw13 greater than DR3 greater than DR2. The molecules carrying the PL2 determinant on DR7 cells have been characterized biochemically to be a subpopulation of HLA class II molecules recognized by the DR specific monoclonal antibody, L243. Furthermore, by two-dimensional gel analysis, PL2 immunoprecipitated only two of three beta chains associated with the DR-apha chain, which are the same two chains that carry the DR7 allodeterminants.(ABSTRACT TRUNCATED AT 250 WORDS)
Horibe
K
K
Knowles
R W
RW
Dupont
B
B
D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology*; D002460:Cell Line; D003602:Cytotoxicity, Immunologic; D000939:Epitopes / Q000032:analysis*; D006684:HLA-DR Antigens; D015802:HLA-DR2 Antigen; D015803:HLA-DR3 Antigen; D015805:HLA-DR5 Antigen; D015808:HLA-DR6 Antigen; D015809:HLA-DR7 Antigen; D000949:Histocompatibility Antigens Class II / Q000276:immunology*; D006801:Humans; D007945:Leukemia, Lymphoid / Q000276:immunology; D051379:Mice; D008815:Mice, Inbred Strains
D000939:Epitopes; D006684:HLA-DR Antigens; D015802:HLA-DR2 Antigen; D015803:HLA-DR3 Antigen; D015805:HLA-DR5 Antigen; D015808:HLA-DR6 Antigen; D015809:HLA-DR7 Antigen; D000949:Histocompatibility Antigens Class II