Antigenic Specificity of Human Antibody to Chlamydia in Trachoma and Lymphogranuloma Venereum Free

Abstract

An understanding of the molecular basis of the humoral immune response to chlamydial infections in man requires the identification of target antigens to which antibodies are directed. The antigenic specificity of antibody from patients with lymphogranuloma venereum (LGV) or trachoma was therefore assessed by Western blotting. Surface polypeptides were first identified using purified chlamydial outer membrane complex as antigen. Antibodies in sera from patients with LGV but not from control negative sera reacted with a wide range of chlamydial surface polypeptides with molecular masses of 19, 29, 41, 58, 63 and 65 kDa. The major component of the antibody response detected by both immunoblotting and immunoprecipitation assay was directed against the major outer membrane protein (MOMP). Antibody to MOMP was species-specific on Western blotting, whereas antibody to several other polypeptides recognized common immunodeterminants on polypeptides of Cal-10 of equivalent molecular mass. Immunologically Cal-10 was more closely related to LGV strains of than a guinea pig inclusion conjunctivitis strain of

Trachoma sera collected from a village in southern Iran showed predominantly type-specific antibody on micro-immunofluorescence to serotype A or B trachoma agents. These sera showed a weak immune response to MOMP, a pronounced response to a polypeptide of 36 kDa and much less widespread reactivity with other chlamydial polypeptides. The lack of an immune response to SDS-stable immunodeterminants on MOMP might contribute to the susceptibility of trachoma patients to repeated cycles of ocular infection with chlamydiae.

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1986-06-01
2024-03-29
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