Human MHC class II molecules as differentiation markers
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Abstract
DA6.231 and DA6.164 are mouse monoclonal antibodies that immunoprecipitate HLA-DR-like p34,29 glycoprotein dimers from surface- and metabolically-labeled cells. On lymphoblastoid cell lines the distribution of the 231 epitope is completely nonpolymorphic, while the 164 epitope is present on all cells except on those that are DR7 homozygous. Binding-inhibition studies show that the 231 and 164 epitopes are spatially close to each other when present on the same molecule. The mutual inhibition pattern and the absence of the 164 epitope from the 231+ cells of a few leukemia patients suggest, however, that 231 and 164 epitopes are not invariably present together. Most DR-positive cells possess 231− 164+ and 231+ 164− class 11 molecules in approximately a 2:1 ratio. This has been confirmed by immune depletion studies. Thus DA6.231 appears to define a supralocus epitope. The 164 epitope may be a marker for a subset of class 11 molecules exhibiting differential expression on various cell types immortalized by malignant transformation.
Keywords
Monoclonal Antibody Leukemia Malignant Transformation Differentiation Marker Mouse Monoclonal AntibodyPreview
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