Monoclonal antibody definition of the DRB3 allele, HLA-Dw25

Monoclonal antibodies are powerful tools for analyzing HLA antigen polymorphism. We have investigated the serological and biochemical nature of the DRw52-related antigen defined by the monoclonal antibody NDS10. A detailed analysis of the population distribution of NDS10 reactivity revealed that the epitope was present on a subpopulation of DRw52 positive cells. A distinct pattern of reactivity was found within DR3 individuals: all of the B18.DR3 cells were NDS10 positive, whereas the A1,B8,DR3 cells were negative. All of the DR5(w 11) cells and two of three DRwl2 cells reacted with NDS10. NDS10 reactivity with DRw6 was not restricted to either of the serologically defined subtypes; three of 17 DRwl3 and nine of 10 DRwl4 cells were NDS10 positive. NDS10 was unreactive with all of the DRw8 cells tested. Two-dimensional gel analyses revealed that the NDS10 molecule precipitated from DR3, DR5(w11) and DRw6(w14) cell lines had an identical β chain profile. These data indicate that NDS10 recognises the Dw25 allele of the DRw52 complex.