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Open AccessArticle

Reduced Renal Colonization and Enhanced Protection by Leptospiral Factor H Binding Proteins as a Multisubunit Vaccine against Leptospirosis in Hamsters

1
Department of Microbiology, Faculty of Medicine, Chulalongkorn University, Pathumwan, Bangkok 10330, Thailand
2
Chula Vaccine Research Center (Chula VRC), Center of Excellence in Vaccine Research and Development, Chulalongkorn University, Pathumwan, Bangkok 10330, Thailand
3
Vaccine Formulation Laboratory (VFL), University of Lausanne, Epalinges 1066, Switzerland
4
Department of Microbiology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
5
Armed Force Research Institute of Medical Sciences (AFRIMS), Ratchathewi, Bangkok 10400, Thailand
6
Institute of Molecular Biosciences, Mahidol University, Nakhon Pathom 73170, Thailand
*
Author to whom correspondence should be addressed.
Vaccines 2019, 7(3), 95; https://doi.org/10.3390/vaccines7030095
Received: 4 August 2019 / Revised: 19 August 2019 / Accepted: 20 August 2019 / Published: 22 August 2019
(This article belongs to the Section Veterinary Vaccines)
Subunit vaccines conferring complete protection against leptospirosis are not currently available. The interactions of factor H binding proteins (FHBPs) on pathogenic leptospires and host factor H are crucial for immune evasion by inhibition of complement-mediated killing. The inhibition of these interactions may be a potential strategy to clear leptospires in the host. This study aimed to evaluate a multisubunit vaccine composed of four known leptospiral FHBPs: LigA domain 7–13 (LigAc), LenA, LcpA, and Lsa23, for its protective efficacy in hamsters. The mono and multisubunit vaccines formulated with LMQ adjuvant, a combination of neutral liposome, monophosphoryl lipid A, and Quillaja saponaria fraction 21, induced high and comparable specific antibody (IgG) production against individual antigens. Hamsters immunized with the multisubunit vaccine showed 60% survival following the challenge by 20× LD50 of Leptospira interrogans serovar Pomona. No significant difference in survival rate and pathological findings of target organs was observed after vaccinations with multisubunit or mono-LigAc vaccines. However, the multisubunit vaccine significantly reduced leptospiral burden in surviving hamsters in comparison with the monosubunit vaccines. Therefore, the multisubunit vaccine conferred partial protection and reduced renal colonization against virulence Leptospira infection in hamsters. Our multisubunit formulation could represent a promising vaccine against leptospirosis. View Full-Text
Keywords: leptospirosis; Leptospira; factor H binding protein; multisubunit vaccine; neutral liposome; MPL; QS21 leptospirosis; Leptospira; factor H binding protein; multisubunit vaccine; neutral liposome; MPL; QS21
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Techawiwattanaboon, T.; Barnier-Quer, C.; Palaga, T.; Jacquet, A.; Collin, N.; Sangjun, N.; Komanee, P.; Piboonpocanun, S.; Patarakul, K. Reduced Renal Colonization and Enhanced Protection by Leptospiral Factor H Binding Proteins as a Multisubunit Vaccine against Leptospirosis in Hamsters. Vaccines 2019, 7, 95.

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