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The cationic liposomal adjuvants CAF01 and CAF09 formulated with the major outer membrane protein elicit robust protection in mice against a Chlamydia muridarum respiratory challenge.
Vaccine 2017 Februrary 24
Two cationic liposomal adjuvants CAF01 and CAF09 were formulated with the native or the recombinant Chlamydia muridarum major outer membrane protein (nMOMP and rMOMP). BALB/c mice were immunized with the four vaccine formulations using the subcutaneous followed by the intranasal (i.n.) routes. As positive controls mice were inoculated i.n. with live C. muridarum and negative controls received i.n. minimal essential medium (MEM). Four weeks after the last immunization mice were challenged i.n. with 10(4) inclusion forming units (IFU) of C. muridarum. Following the challenge the mice were weighed daily. At 10days post-challenge the mice were euthanized, their lungs weighed and the number of C. muridarum IFU determined. Serum collected the day before the challenge showed that all four groups of mice immunized with CAF01, or CAF09 and MOMP had significant C. muridarum-specific antibody titers. As determined by a T-cell lymphoproliferative assay, these four groups of mice also mounted robust cell mediated immune responses with high production of IFN-γ and IL17 and low levels of IL-4. Following the challenge the four groups of mice lost significantly less body weight than the MEM-immunized group. Lungs of mice vaccinated with CAF01, or CAF09, and nMOMP were significantly lighter than those from mice immunized using rMOMP. The number of IFU recovered from the lungs of mice vaccinated with CAF01, or CAF09, and nMOMP was similar to the number of IFU recovered from mice immunized with live EB. Mice that received rMOMP had significantly higher numbers of IFU than other groups. In conclusion, CAF01 and CAF09 elicited very robust protective humoral and cellular immune responses and were equally effective at adjuntavizing the C. muridarum MOMP. Mice vaccinated with nMOMP were significantly better protected than those immunized with rMOMP, indicative of the importance of the structural conformation of this antigen in protection.
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