Synergistic genetic defect in B-lymphocyte function. I. Defective responses to B-cell stimulants and their genetic basis

doi:10.1084/jem.151.1.224

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Synergistic genetic defect in B-lymphocyte function. I. Defective responses to B-cell stimulants and their genetic basis

C Bona, JJ Mond and WE Paul

CBA/N female mice, which express an X-linked defect in B-lymphocyte function, were mated with C3H/HeJ male mice, which are unresponsive to lipopolysaccharide (LPS). The resulting F1 hybrid females were mated to C3H/HeJ males. Approximately one-half of the backcross (BC.1) males obtained from this mating expressed a more profound immunologic defect than either of the parental strains. Spleen cells from these mice were unresponsive to a series of B-cell mitogens including LPS prepared from Escherichia coli K235 and from E. coli 0111:B4, lipoprotein mitogen from E. coli, and Nocardia water-soluble mitogen (NWSM). They failed to give in vitro antibody responses to the thymus-independent type 2 (TI- 2) antigen trinophenylated Ficoll and most were unresponsive to the TI- 1 antigens trinitrophenylated Brucella abortus, trinitrophenylated LPS, and trinitrophenylated NWSM. This synergistic defect in B-lymphocyte function depended on the presence of the CBA/N xid gene but the critical gene(s) from the C3H strain was not the defective Lps gene (Lpsd). These mice should provide a valuable tool for the elucidation of B-lymphocyte ontogeny, heterogeneity, and function.
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