Abstract
The hypervariable regions of the immunoglobulins which function as the antigen binding sites are capable of provoking an antibody response and are referred to as anti-idiotypic antibodies. Antisera were raised in rabbits against the idiotypes of a mouse monoclonal antibody HGT3a which binds only to the 38 kDa antigen of the M. tuberculosis complex group of organisms. Idiotype specificity in these antisera was determined by dot ELISA, Western blot and solid phase inhibition assays. In vivo administration of this rabbit anti-idiotypic antibody to Swiss mice evoked an anti-anti-idiotypic antibody response, further confirming the internal antigen mimicry by the anti-idiotypic antibodies of the 38 kDa antigenic epitope and its potential use as a surrogate antigen. Antibody response to the anti-idiotypic antibodies in the sera of patients with pulmonary tuberculosis showed significant correlation with the antibody response to the 38 kDa antigen studied in the same clinical samples indicating a close similarity of the 38 kDa antigen of M. tuberculosis and the rabbit andi-idiotypic antibody produced against MoAb HGT3a.
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