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Chlamydia trachomatis native major outer membrane protein induces partial protection in nonhuman primates: implication for a trachoma transmission-blocking vaccine.
- Source :
-
Journal of immunology (Baltimore, Md. : 1950) [J Immunol] 2009 Jun 15; Vol. 182 (12), pp. 8063-70. - Publication Year :
- 2009
-
Abstract
- A vaccine is likely the most effective strategy for controlling human chlamydial infections. Recent studies have shown immunization with Chlamydia muridarum major outer membrane protein (MOMP) can induce significant protection against infection and disease in mice if its native trimeric structure is preserved (nMOMP). The objective of this study was to investigate the immunogenicity and vaccine efficacy of Chlamydia trachomatis nMOMP in a nonhuman primate trachoma model. Cynomolgus monkeys (Macaca fascicularis) were immunized systemically with nMOMP, and monkeys were challenged ocularly. Immunization induced high serum IgG and IgA ELISA Ab titers, with Abs displaying high strain-specific neutralizing activity. The PBMCs of immunized monkeys produced a broadly cross-reactive, Ag-specific IFN-gamma response equivalent to that induced by experimental infection. Immunized monkeys exhibited a significant decrease in infectious burden during the early peak shedding periods (days 3-14). However, at later time points, they exhibited no difference from control animals in either burden or duration of infection. Immunization had no effect on the progression of ocular disease. These results show that systemically administered nMOMP is highly immunogenic in nonhuman primates and elicits partially protective immunity against ocular chlamydial challenge. This is the first time a subunit vaccine has shown a significant reduction in ocular shedding in nonhuman primates. A partially protective vaccine, particularly one that reduces infectious burden after primary infection of children, could interrupt the natural trachoma reinfection cycle. This would have a beneficial effect on the transmission between children and sensitized adults which drives blinding inflammatory disease.
- Subjects :
- Animals
Antibodies, Bacterial blood
Antibodies, Bacterial immunology
Antibody Specificity
Chlamydia Infections pathology
Chlamydia Infections transmission
Cytokines immunology
Cytokines metabolism
Disease Models, Animal
Enzyme-Linked Immunosorbent Assay
HeLa Cells
Humans
Kinetics
Leukocytes immunology
Leukocytes metabolism
Male
Protein Denaturation
Titrimetry
Bacterial Outer Membrane Proteins immunology
Bacterial Vaccines immunology
Chlamydia Infections immunology
Chlamydia Infections prevention & control
Chlamydia trachomatis immunology
Macaca fascicularis immunology
Subjects
Details
- Language :
- English
- ISSN :
- 1550-6606
- Volume :
- 182
- Issue :
- 12
- Database :
- MEDLINE
- Journal :
- Journal of immunology (Baltimore, Md. : 1950)
- Publication Type :
- Academic Journal
- Accession number :
- 19494332
- Full Text :
- https://doi.org/10.4049/jimmunol.0804375