Abstract
Spleen and peritoneal cells from unimmunized BALB/c mice were cultured in the presence of LPS for 24 hr and fused to produce hybridomas secreting antibodies against bromelain-treated mouse erythrocytes (BrMRBC). Three clones from spleen cells and eight clones from peritoneal cells were isolated and characterized further. All the monoclonal antibodies had IgMκ isotype. Their reactivities against untreated and bromelain-treated erythrocytes from various species were assessed by hemolysis and indirect radioimmunoassay; all the clones had similar antigen specificities. On the isoelectric focussing patterns of light chains, they were separated into two groups, two and nine clones, and all the light chains in each group showed identical patterns. The two groups shared no common idiotope detectable by anti-idiotype antibodies prepared by immunization of rabbits with the monoclonal antibodies, but all the antibodies in each group shared common idiotopes. In each group, one antibody had a unique idiotope different from any other antibody, but eight antibodies in a group shared another identical idiotope. These findings suggest the restricted heterogeneity of anti-BrMRBC antibodies in the mouse.
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