A mouse monoclonal antibody reactive preferentially with human IgM lambda.
In analyzing mouse monoclonal antibodies (mAb) against a human IgM kappa paraprotein, we found an unusual mAb (LP4; gamma 2b kappa isotype) that reacted in an enzyme linked immunosorbent assay with all 5 IgM lambda but not with 8 IgM kappa or other myelomas. Neither isolated mu heavy nor lambda light chains were reactive with LP4 mAb. By immunofluorescence, LP4 mAb identified approximately 30% of IgM+ B cells and approximately 40% of mitogen-stimulated, IgM+ plasma cells from 4-7 normal blood samples. All LP4+ cells were IgM+. Biosynthetic analysis of the plasma cells revealed that LP4 mAb recognized most IgM lambda and a very minor proportion of IgM kappa molecules. This mAb provides a useful marker for the analysis of pre-B and B cell differentiation.
Ohno
T
T
Department of Medicine, University of Alabama, Birmingham.
Cooper
M D
MD
Kubagawa
H
H
D000818:Animals; D000888:Antibodies, Anti-Idiotypic; D000911:Antibodies, Monoclonal; D000918:Antibody Specificity; D000939:Epitopes; D006801:Humans; D006825:Hybridomas / Q000276:immunology; D007075:Immunoglobulin M; D007146:Immunoglobulin lambda-Chains; D051379:Mice
D000888:Antibodies, Anti-Idiotypic; D000911:Antibodies, Monoclonal; D000939:Epitopes; D007075:Immunoglobulin M; D007146:Immunoglobulin lambda-Chains