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Tang L, Yang Z, Zhang H, Zhou Z, Arulanandam B, Baseman J, Zhong G. Induction of protective immunity against Chlamydia muridarum intracervical infection in DBA/1j mice. Vaccine 2013; 32:1407-13. [PMID: 24188757 DOI: 10.1016/j.vaccine.2013.10.018] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2013] [Revised: 09/25/2013] [Accepted: 10/03/2013] [Indexed: 12/22/2022]
Abstract
We previously reported that intracervical inoculation with Chlamydia muridarum induced hydrosalpinx in DBA/1j mice, but intravaginal inoculation failed to do so. In the current study, we found unexpectedly that intrabursal inoculation of live chlamydial organisms via the oviduct failed to induce significant hydrosalpinx. We further tested whether primary infection via intravaginal or intrabursal inoculation could induce protective immunity against hydrosalpinx following intracervical challenge infection. Mice infected intravaginally with C. muridarum were fully protected from developing hydrosalpinx, while intrabursal inoculation offered partial protection. We then compared immune responses induced by the two genital tract inoculations. Both inoculations induced high IFNγ and IL-17 T cell responses although the ratio of IgG2a versus IgG1 in intravaginally infected mice was significantly higher than in mice infected intrabursally. When the antigen-specificities of antibody responses were compared, both groups of mice dominantly recognized 24 C. muridarum antigens, while each group preferentially recognized unique sets of antigens. Thus, we have demonstrated that intrabursal inoculation is neither effective for causing hydrosalpinx nor efficient in inducing protective immunity in DBA/1j mice. Intravaginal immunization, in combination with intracervical challenge infection in DBA/1j mice, can be a useful model for understanding mechanisms of chlamydial pathogenicity and protective immunity.
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Affiliation(s)
- Lingli Tang
- Department of Microbiology and Immunology, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA; Department of Clinic Laboratory, Second Xiangya Hospital, Central South University, 139 Renmin Middle Rd., Changsha, Hunan 410011, China
| | - Zhangsheng Yang
- Department of Microbiology and Immunology, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA
| | - Hongbo Zhang
- Department of Microbiology and Immunology, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA
| | - Zhiguang Zhou
- Department of Clinic Laboratory, Second Xiangya Hospital, Central South University, 139 Renmin Middle Rd., Changsha, Hunan 410011, China
| | - Bernard Arulanandam
- Department of Biology, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA
| | - Joel Baseman
- Department of Microbiology and Immunology, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA
| | - Guangming Zhong
- Department of Microbiology and Immunology, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA.
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Lu C, Peng B, Li Z, Lei L, Li Z, Chen L, He Q, Zhong G, Wu Y. Induction of protective immunity against Chlamydia muridarum intravaginal infection with the chlamydial immunodominant antigen macrophage infectivity potentiator. Microbes Infect 2013; 15:329-38. [PMID: 23416214 DOI: 10.1016/j.micinf.2013.02.001] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2012] [Revised: 01/28/2013] [Accepted: 02/03/2013] [Indexed: 12/21/2022]
Abstract
We previously reported that 5 Chlamydia muridarum antigens reacted with antisera from >90% mice urogenitally infected with C. muridarum and they are TC0660 (ABC transporter or ArtJ), TC0727 (outer membrane complex protein B or OmcB), TC0828 (macrophage infectivity potentiator or MIP), TC0726 (inclusion membrane protein or Inc) & TC0268 (hypothetical protein or HP). The orthologs of these antigens in Chlamydia trachomatis were also highly reactive with antisera from women urogenitally infected with C. trachomatis. In the current study, we evaluated these C. muridarum antigens for their ability to induce protection against a C. muridarum intravaginal challenge infection in mice. We found that only MIP induced the most pronounced protection against C. muridarum infection. The protection correlated well with robust C. muridarum MIP-specific antibody and Th1-dominant T cell responses. The MIP-immunized mice displayed significantly reduced live organism shedding from the lower genital tract and highly attenuated inflammatory pathologies in the upper genital tissues. These results demonstrate that MIP, an immunodominant antigen identified by both human and mouse antisera, may be considered a component of a multi-subunit chlamydial vaccine for inducing protective immunity.
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Affiliation(s)
- Chunxue Lu
- Department of Microbiology and Immunology, University of South China, 28 West Changsheng Rd., Hengyang, Hunan 421001, China
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