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Yam KK, Hugentobler F, Pouliot P, Stern AM, Lalande JD, Matlashewski G, Olivier M, Cousineau B. Generation and evaluation of A2-expressing Lactococcus lactis live vaccines against Leishmania donovani in BALB/c mice. J Med Microbiol 2011; 60:1248-1260. [PMID: 21527547 DOI: 10.1099/jmm.0.029959-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Leishmaniasis is a parasitic disease affecting over 12 million individuals worldwide. As current treatments are insufficient, the development of an effective vaccine is a priority. This study generated and assessed the efficacy of Leishmania vaccines engineered from the non-colonizing, non-pathogenic Gram-positive bacterium Lactococcus lactis. A truncated, codon-optimized version of the A2 antigen from Leishmania donovani was engineered for expression in Lactococcus lactis in three different subcellular compartments: in the cytoplasm, secreted outside the cell or anchored to the cell wall. These three A2-expressing Lactococcus lactis strains were tested for their ability to generate A2-specific immune responses and as live vaccines against visceral Leishmania donovani infection in BALB/c mice. Subcutaneous immunization with live Lactococcus lactis expressing A2 anchored to the cell wall effectively induced high levels of antigen-specific serum antibodies. It was demonstrated that Lactococcus lactis-based vaccines are a feasible approach in the generation of live vaccines against leishmaniasis. The Lactococcus lactis strains generated in this study provide an excellent foundation for further studies on live bacterial vaccines against leishmaniasis and other pathogens.
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Affiliation(s)
- Karen K Yam
- Department of Microbiology and Immunology, McGill University, 3775 University Street, Montreal, QC H3A 2B4, Canada
| | - Felix Hugentobler
- Department of Microbiology and Immunology, McGill University, 3775 University Street, Montreal, QC H3A 2B4, Canada
| | - Philippe Pouliot
- Department of Microbiology and Immunology, McGill University, 3775 University Street, Montreal, QC H3A 2B4, Canada
| | - Andrew M Stern
- Department of Microbiology and Immunology, McGill University, 3775 University Street, Montreal, QC H3A 2B4, Canada
| | - Jean-Daniel Lalande
- Department of Microbiology and Immunology, McGill University, 3775 University Street, Montreal, QC H3A 2B4, Canada
| | - Greg Matlashewski
- Department of Microbiology and Immunology, McGill University, 3775 University Street, Montreal, QC H3A 2B4, Canada
| | - Martin Olivier
- Centre for the Study of Host Resistance, Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada.,Department of Microbiology and Immunology, McGill University, 3775 University Street, Montreal, QC H3A 2B4, Canada
| | - Benoit Cousineau
- Department of Microbiology and Immunology, McGill University, 3775 University Street, Montreal, QC H3A 2B4, Canada
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Tsang RS, Nielsen KH, Henning DM, Poppe C, Khakhria R, Woodward DL, Johnson WM. Screening for Salmonella with a murine monoclonal antibody M105 detects both Felix O1 bacteriophage sensitive and resistant Salmonella strains. ZENTRALBLATT FUR BAKTERIOLOGIE : INTERNATIONAL JOURNAL OF MEDICAL MICROBIOLOGY 1997; 286:23-32. [PMID: 9241797 DOI: 10.1016/s0934-8840(97)80071-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Ten Felix O1 (FO1) bacteriophage sensitive Salmonella strains as well as their phage resistant derivates together with 39 strains of FO1-resistant Salmonella were tested for their reactivities with a murine monoclonal antibody, M105, by indirect whole cell and competitive ELISA. All FO1 phage sensitive and 48 of the 49 FO1-resistant Salmonella strains were found to react with M105. The single Salmonella strain not reacting with M105 was a FO1 resistant derivative selected by exposing the sensitive parent strain to the phage. This M105-negative and FO1-resistant strain was also found to be a rough mutant without O-antigens and possibly lacks the terminal LPS core sugars which form the M105 reactive epitope.
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Affiliation(s)
- R S Tsang
- National Laboratory for Enteric Pathogens, Bureau of Microbiology, Health Canada.
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