Recombinant LipL32 stimulates interferon-gamma production in cattle vaccinated with a monovalent Leptospira borgpetersenii serovar Hardjo subtype Hardjobovis vaccine.
Leptospira borgpetersenii serovar Hardjo subtype Hardjobovis (Hardjobovis) is the main causative agent of bovine leptospirosis in Australia, New Zealand, North America and elsewhere. Bovine leptospirosis can result in spontaneous abortion, stillbirth and reduced milk output. The organism is shed in the urine of infected animals and contact with contaminated materials can result in zoonotic infections in humans. Protective immunity in cattle against Hardjobovis involves stimulation of a Th1 cell mediated immune response, which can be characterized by the production of IFN-γ when blood from vaccinated animals is exposed to Hardjobovis antigens. However, the leptospiral components involved in stimulating this response have yet to be identified. In this study, 238 recombinant leptospiral proteins were evaluated for their ability to stimulate IFN-γ production in blood of cattle vaccinated with a commercial monovalent Hardjobovis vaccine. The conserved lipoprotein LipL32 is the major outer membrane protein of pathogenic Leptospira spp. A pool of soluble recombinant proteins which included LipL32, as well as LipL32 alone, stimulated significant IFN-γ production in blood of vaccinated cattle. A number of recombinant LipL32 fragments was generated, which identified the amino acids between 20 and 200 as containing the bovine T-cell reactive regions of LipL32. However, whether LipL32 plays a role in stimulating protective immunity in mammals has yet to be conclusively determined.
Australian Research Council Centre of Excellence in Structural and Functional Microbial Genomics, Departments of Microbiology and Biochemistry & Molecular Biology, Monash University, Clayton 3800, Australia.
Deanna S
DS
Deveson Lucas
Australian Research Council Centre of Excellence in Structural and Functional Microbial Genomics, Departments of Microbiology and Biochemistry & Molecular Biology, Monash University, Clayton 3800, Australia.
Miranda
M
Lo
Australian Research Council Centre of Excellence in Structural and Functional Microbial Genomics, Departments of Microbiology and Biochemistry & Molecular Biology, Monash University, Clayton 3800, Australia.
Dieter M
DM
Bulach
Australian Research Council Centre of Excellence in Structural and Functional Microbial Genomics, Departments of Microbiology and Biochemistry & Molecular Biology, Monash University, Clayton 3800, Australia.
Noelene S
NS
Quinsey
Australian Research Council Centre of Excellence in Structural and Functional Microbial Genomics, Departments of Microbiology and Biochemistry & Molecular Biology, Monash University, Clayton 3800, Australia.
Gerald L
GL
Murray
Pfizer Animal Health, Parkville 3052, Australia.
Andy
A
Allen
Australian Research Council Centre of Excellence in Structural and Functional Microbial Genomics, Departments of Microbiology and Biochemistry & Molecular Biology, Monash University, Clayton 3800, Australia. Electronic address: Ben.Adler@monash.edu.
Ben
B
Adler
D000596:Amino Acids / Q000276:immunology; D000818:Animals; D001425:Bacterial Outer Membrane Proteins / Q000235:genetics / Q000276:immunology*; D001428:Bacterial Vaccines / Q000276:immunology*; D002417:Cattle; D002418:Cattle Diseases / Q000276:immunology*; D005260:Female; D007111:Immunity, Cellular / Q000276:immunology; D007371:Interferon-gamma / Q000097:blood / Q000378:metabolism*; D007919:Leptospira / Q000276:immunology*; D007922:Leptospirosis / Q000276:immunology / Q000662:veterinary*; D008074:Lipoproteins / Q000235:genetics / Q000276:immunology*; D011994:Recombinant Proteins / Q000235:genetics / Q000276:immunology*
D000596:Amino Acids; D001425:Bacterial Outer Membrane Proteins; D001428:Bacterial Vaccines; C406589:LipL32 protein, Leptospira; D008074:Lipoproteins; D011994:Recombinant Proteins; D007371:Interferon-gamma
Bovine; Interferon gamma; Leptospirosis; LipL32; Vaccine