Protein Antigens of Treponema pallidum Reacting with Serum IgM Antibodies of Syphilis Patients

Lee, Min Geol; Sung, Yeol Oh; Kim, Dong Kun; Lee, Jung Bock

Abstract

This study was undertaken to identify the protein antigens reacting with IgM antibodies in the sera of various stages of syphilis before and after treatment, employing sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE), immunoblotting and immunoperoxidase stain. The results were as follows : 1. Before treatment, the most strongly reacting antigens of T. pallidam precipitated by IgM antibodies in the sera of patients were polypeptides of molecular weights 47,000, 34,000 and 29,500. So it was observed that those were the major antigens of T. pallidum reacting with IgM antibodies. 2. After observing protein antigens of T. pallidum reacting with IgM antibodies in the sera of patients with syphilis before and after treatment, it was seen that in primary, secondary and early latent syphilis there was a loss of several antigens and s decrease in reactivity, but no changes occurred in late latent and reinfected syphilis. 3. From the observation of the reaction between serum antibodies of patients with trested syphilis and major antigens of T. pallidum, an evident decrease in reactivity was observed only with protein antigen of molecular weight 47,000 which reacts with IgM antibody. From the above results, it could be concluded that of molecular weight 47,000 could contribute to the assessment of the diagnosis of syphilis and the efficacy of treatment.