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. 1982 Nov;38(2):745–754. doi: 10.1128/iai.38.2.745-754.1982

Neutralization of Chlamydia trachomatis infectivity with antibodies to the major outer membrane protein.

H D Caldwell, L J Perry
PMCID: PMC347801  PMID: 7141712

Abstract

Rabbit immunoglobulin G (IgG) antibodies raised against the major outer membrane protein of the Chlamydia trachomatis lymphogranuloma venereum strain 434 neutralized the infectivity of the parasite for HeLa 229 cells. The mechanism by which anti-major outer membrane protein IgG prevented C. trachomatis from establishing infection was studied by using intrinsically 14C-radiolabeled elementary bodies. Neutralized elementary bodies were filterable through a polycarbonate filter (pore diameter, 600 nm), demonstrating that reduction in infectivity was not due to the aggregation of elementary bodies by cross-linking IgG. Antibody-neutralized elementary bodies attached to and penetrated HeLa cells at rats nearly identical to those for infectious organisms exposed to nonneutralizing control IgG. These results suggest that antibody interferes with the infectious process of the parasite after its internalization. Anti-major outer membrane protein Fab fragments could not be substituted for neutralizing IgG antibodies. The requirement for intact IgG implies that cross-linking of antibodies to the major outer membrane protein on the surfaces of the organisms may be instrumental in neutralization.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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