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Development and evaluation as vaccines in mice of Brucella melitensis Rev.1 single and double deletion mutants of the bp26 and omp31 genes coding for antigens of diagnostic significance in ovine brucellosis
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Development and evaluation as vaccines in mice of Brucella melitensis Rev.1 single and double deletion mutants of the bp26 and omp31 genes coding for antigens of diagnostic significance in ovine brucellosis
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Development and evaluation as vaccines in mice of Brucella melitensis Rev.1 single and double deletion mutants of the bp26 and omp31 genes coding for antigens of diagnostic significance in ovine brucellosis
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Journal Article
Development and evaluation as vaccines in mice of Brucella melitensis Rev.1 single and double deletion mutants of the bp26 and omp31 genes coding for antigens of diagnostic significance in ovine brucellosis
2004
Overview
The live attenuated
Brucella melitensis Rev.1 strain is considered the best vaccine available for the prophylaxis of brucellosis in sheep caused by either
B. melitensis or
Brucella ovis. However, its application stimulates antibody responses in vaccinated animals indistinguishable by the current conventional serological tests from those observed in infected animals. The periplasmic protein BP26 and the outer membrane protein (OMP) Omp31 are immunodominant antigens in the serological responses of
B. melitensis and
B. ovis infected sheep, respectively. Accordingly, vaccine strain Rev.1 single and double deletion mutants of the
bp26 and
omp31 genes were developed, based on the principle that the use of such mutants as vaccines in association with diagnostic tests based on BP26 and Omp31 antigens would allow the serological differentiation between infected and vaccinated animals. The deletion mutants obtained were indistinguishable from the parental Rev.1 strain by conventional bacteriological and typing tests. The expression of their major surface antigens, as determined by reactivity with specific monoclonal antibodies (MAbs), remained unaffected, i.e. smooth-lipopolysaccharide (S-LPS) and OMPs besides in the expression of the antigens whose respective genes were deleted. The
bp26 and
omp31 deletions did not modify the kinetics of splenic infection nor the residual virulence of Rev.1 in the BALB/c mouse model. Vaccination of BALB/c mice with the deletion mutants conferred significant protective immunity against
B. melitensis strain H38 or
B. ovis strain PA challenges, to the same extent as that induced by parental Rev.1 strain. Thus, these Rev.1
bp26 or
omp31 deletion mutants are promising vaccine candidates against
B. melitensis and
B. ovis infections and will be further evaluated in sheep.
Publisher
Elsevier Ltd,Elsevier
Subject
/ Antibodies, Monoclonal - pharmacology
/ Antigens, Bacterial - genetics
/ Bacterial Outer Membrane Proteins - genetics
/ Biological and medical sciences
/ Brucella melitensis - genetics
/ Brucella melitensis - immunology
/ Cattle
/ Cattle Diseases - immunology
/ Enzyme-Linked Immunosorbent Assay
/ Female
/ Fundamental and applied biological sciences. Psychology
/ Lipopolysaccharides - immunology
/ Membrane Proteins - genetics
/ Mice
/ Mutants
/ Vaccines, antisera, therapeutical immunoglobulins and monoclonal antibodies (general aspects)
