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- W2116355513 abstract "ABSTRACT Urogenital Chlamydia serovars replicating in reproductive epithelium pose a unique challenge to host immunity and vaccine development. Previous studies have shown that CD4 T cells are necessary and sufficient to clear primary Chlamydia muridarum genital tract infections in the mouse model, making a protective CD4 T cell response a logical endpoint for vaccine development. Our previous proteomics studies identified 13 candidate Chlamydia proteins for subunit vaccines. Of those, PmpG-1 is the most promising vaccine candidate. To further that work, we derived a PmpG 303-311 -specific multifunctional Th1 T cell clone, designated PmpG1.1, from an immune C57BL/6 mouse and used it to investigate the presentation of the PmpG 303-311 epitope by infected epithelial cells. Epithelial presentation of the PmpG 303-311 epitope required bacterial replication, occurred 15 to 18 h postinfection, and was unaffected by gamma interferon (IFN-γ) pretreatment. Unlike epitopes recognized by other Chlamydia -specific CD4 T cell clones, the PmpG 303-311 epitope persisted on splenic antigen-presenting cells (APC) of mice that cleared primary genital tract infections. PmpG1.1 was activated by unmanipulated irradiated splenocytes from immune mice without addition of exogenous Chlamydia antigen, and remarkably, activation of PmpG1.1 by unmanipulated immune splenocytes was stronger 6 months postinfection than it was 3 weeks postinfection. Enhanced presentation of PmpG 303-311 epitope on splenic APC 6 months postinfection reflects some type of “consolidation” of a protective immune response. Understanding the antigen-presenting cell populations responsible for presenting PmpG 303-311 early (3 weeks) and late (6 months) postinfection will likely provide important insights into stable protective immunity against Chlamydia infections of the genital tract." @default.
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- W2116355513 date "2012-06-01" @default.
- W2116355513 modified "2023-09-26" @default.
- W2116355513 title "PmpG <sub>303-311</sub> , a Protective Vaccine Epitope That Elicits Persistent Cellular Immune Responses in Chlamydia muridarum-Immune Mice" @default.
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- W2116355513 doi "https://doi.org/10.1128/iai.06339-11" @default.
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