Antigenic heterogeneity of Qa-2 antigens in C57BL/6.
The Qa-2 antigens are class I-like molecules encoded by genes mapped telomeric to the H-2D region on chromosome 17 in the mouse. A panel of 8 new monoclonal anti-Qa-2 antibodies derived from a C3H.KBR anti-C3H. SW immunization was studied. Immunoprecipitation of 125I-labeled C57BL/6 splenocyte antigens showed that all of these antibodies precipitated 40 kDa molecules which could be completely precleared by the monoclonal antibody 20-8-4, which had previously been shown to crossreact with Qa-2. One of the monoclonal antibodies (1-12-1), however, was found not to completely preclear Qa-2 antigens precipitable by the other 7 antibodies or by 20-8-4, suggesting the existence of at least two different species of Qa-2 molecules. Cell lines transfected with Q7 or Q9 genes were reactive with all 9 antibodies and the Qa-2 antigens expressed on surface membranes of these cells were completely precleared by both 20-8-4 and 1-12-1. Therefore, the observed heterogeneity of these molecules cannot be explained by an antigenic difference between the Q7 and Q9 gene products. 2D gel analyses showed identical pI spectra between Qa-2 molecules precipitated with 20-8-4 and 1-12-1. In addition, all of the monoclonal antibodies reacted with labeled antigen preparations following treatment with Endo F or neuraminidase, indicating that carbohydrate moieties are probably not responsible for the antigenic difference between the two species of Qa-2 antigen.
Park
E
E
Immunology Branch, National Cancer Institute, National Institutes of Health, Bethesda, Md.
Shinohara
N
N
Arn
J S
JS
Sharrow
S O
SO
Waneck
G L
GL
Sacks
D H
DH
D000818:Animals; D000911:Antibodies, Monoclonal; D000918:Antibody Specificity; D003429:Cross Reactions; D005805:Genes, MHC Class I / Q000235:genetics; D014644:Genetic Variation; D006183:H-2 Antigens / Q000276:immunology*; D015395:Histocompatibility Antigens Class I / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C / Q000276:immunology; D008809:Mice, Inbred C3H / Q000276:immunology; D008810:Mice, Inbred C57BL / Q000276:immunology; D008815:Mice, Inbred Strains / Q000276:immunology*; D011233:Precipitin Tests; D013154:Spleen / Q000276:immunology; D014162:Transfection
D000911:Antibodies, Monoclonal; D006183:H-2 Antigens; D015395:Histocompatibility Antigens Class I; C032907:Q surface antigens