Publication: OmpL1 DNA vaccine cross-protects against heterologous Leptospira spp. challenge
Issued Date
2007-03-01
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ISSN
0125877X
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2-s2.0-34250850715
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Mahidol University
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SCOPUS
Bibliographic Citation
Asian Pacific Journal of Allergy and Immunology. Vol.25, No.1 (2007), 75-82
Suggested Citation
Santi Maneewatch, Pramuan Tapchaisri, Yuwaporn Sakolvaree, Buppa Klaysing, Pongsri Tongtawe, Urai Chaisri, Thaweesak Songserm, Surasakdi Wongratanacheewin, Potjanee Srimanote, Manas Chongsa-nguan, Wanpen Chaicumpa OmpL1 DNA vaccine cross-protects against heterologous Leptospira spp. challenge. Asian Pacific Journal of Allergy and Immunology. Vol.25, No.1 (2007), 75-82. Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/24572
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Title
OmpL1 DNA vaccine cross-protects against heterologous Leptospira spp. challenge
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Abstract
Available leptospirosis vaccines made up of inactivated bacteria or their membrane components elicit immunity which is serovar specific and unsatisfactory immunological memory. A vaccine that protects across Leptospira serogroups/serovars, i.e. broad spectrum, and induces long-lasting memory is needed for both human and veterinary uses. In this study, a plasmid DNA vaccine was constructed from cloning gene encoding a transmembrane porin protein, OmpL1, of pathogenic Leptospira interrogans, serogroup Icterohaemorrhagiae, serovar Copenhageni into a mammalian expression vector pcDNA3.1(+). The protective efficacy of the ompL1-pcDNA3.1(+) plasmid DNA vaccine was studied by immunizing hamsters intramuscularly with three doses of the vaccine (100 μg per dose) at two week intervals. The empty pcDNA3.1(+) and PBS were used as mock as negative vaccine controls, respectively. All animals were challenged with the heterologous Leptospira interrogans, serogroup Pomona, serovar Pomona (10 LD50), at one week after the last vaccine booster. The ompL1-pcDNA3.1(+) plasmid DNA vaccine rescued some vaccinated animals from the lethal challenge and delayed death time, reduced morbidity, e.g. fever, and/or the numbers of Leptospira in the tissues of the vaccinated animals. While the results are encouraging, further studies are needed to optimize the immunization schedule, vaccine dosage and formulation in order to maximize the efficacy of the vaccine.