TY - JOUR
T1 - A DNA prime-Mycobacterium bovis BCG boost vaccination strategy for cattle induces protection against bovine tuberculosis?
AU - Skinner, Margot A.
AU - Buddle, Bryce M.
AU - Wedlock, D. Neil
AU - Keen, Denise
AU - De Lisle, Geoffrey W.
AU - Tascon, Ricardo E.
AU - Candido, Jose Ferraz
AU - Lowrie, Douglas B.
AU - Cockle, Paul J.
AU - Vordermeier, H. Martin
AU - Hewinson, R. Glyn
PY - 2003/9/1
Y1 - 2003/9/1
N2 - The variable efficacy of bacillus Calmette-Guérin (Mycobacterium bovis BCG) in protecting humans and cattle against tuberculosis has prompted a search for a more effective vaccination regimen. A prime-boost strategy was investigated in cattle naturally sensitized to environmental mycobacteria by using a combination of three DNA vaccines coding for Hsp 65, Hsp 70, and Apa for priming, followed by a boost with BCG prior to experimental challenge with virulent M. bovis. Controls were vaccinated with DNA or BCG alone or were not vaccinated. The immune responses were monitored throughout the study, and protection was assessed based on reductions in the numbers of lesions and viable mycobacteria in lymph node samples. Vaccination with BCG alone or with a DNA prime-BCG boost regimen induced high levels of antigen-specific gamma interferon (IFN-γ) in whole-blood cultures. In the prime-boost group there were fewer animals with severe lung lesions, fewer lymph nodes with lesions per animal, a smaller proportion of animals with lesions, lower mean lung and lymph node lesion scores, and less M. bovis isolated from retropharyngeal and thoracic lymph nodes compared to the results obtained for the nonvaccinated animals. The prime-boost regimen induced significant enhancement of protection in six parameters, compared with significant enhancement of protection in only two parameters for BCG alone. In addition, following challenge, in vitro IFN-γ responses against ESAT-6 and CFP-10, as well as bovine tuberculin-induced skin test and in vitro IFN-γ responses, were identified as immunological markers that predicted protection. The use of the prime-boost strategy suggested that a combination of vaccines may be better than a single vaccine for protection against tuberculosis.
AB - The variable efficacy of bacillus Calmette-Guérin (Mycobacterium bovis BCG) in protecting humans and cattle against tuberculosis has prompted a search for a more effective vaccination regimen. A prime-boost strategy was investigated in cattle naturally sensitized to environmental mycobacteria by using a combination of three DNA vaccines coding for Hsp 65, Hsp 70, and Apa for priming, followed by a boost with BCG prior to experimental challenge with virulent M. bovis. Controls were vaccinated with DNA or BCG alone or were not vaccinated. The immune responses were monitored throughout the study, and protection was assessed based on reductions in the numbers of lesions and viable mycobacteria in lymph node samples. Vaccination with BCG alone or with a DNA prime-BCG boost regimen induced high levels of antigen-specific gamma interferon (IFN-γ) in whole-blood cultures. In the prime-boost group there were fewer animals with severe lung lesions, fewer lymph nodes with lesions per animal, a smaller proportion of animals with lesions, lower mean lung and lymph node lesion scores, and less M. bovis isolated from retropharyngeal and thoracic lymph nodes compared to the results obtained for the nonvaccinated animals. The prime-boost regimen induced significant enhancement of protection in six parameters, compared with significant enhancement of protection in only two parameters for BCG alone. In addition, following challenge, in vitro IFN-γ responses against ESAT-6 and CFP-10, as well as bovine tuberculin-induced skin test and in vitro IFN-γ responses, were identified as immunological markers that predicted protection. The use of the prime-boost strategy suggested that a combination of vaccines may be better than a single vaccine for protection against tuberculosis.
UR - http://www.scopus.com/inward/record.url?scp=0041823530&partnerID=8YFLogxK
U2 - 10.1128/IAI.71.9.4901-4907.2003
DO - 10.1128/IAI.71.9.4901-4907.2003
M3 - Article
C2 - 12933831
AN - SCOPUS:0041823530
SN - 0019-9567
VL - 71
SP - 4901
EP - 4907
JO - Infection and Immunity
JF - Infection and Immunity
IS - 9
ER -