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Infect. Immun., May 1995, 1718-1724, Vol 63, No. 5
C Morissette, E Skamene and F Gervais
The early endobronchial inflammation induced by Pseudomonas aeruginosa
infection varies in resistant and susceptible strains of mice. Mice of the
DBA/2 strain are severely afflicted by the infection, with a high bacterial
burden accumulating rapidly following inoculation and a high mortality rate
occurring. Mice of the BALB/c strain are resistant to infection and clear
the bacteria within 3 to 7 days. Infection of (BALB/c x DBA/2)F1 hybrid
mice showed that the resistance to lung P. aeruginosa infection is
inherited as a dominant trait. Mice of the A/J and C57BL/6 strains were
found to have an intermediate phenotype to Pseudomonas aeruginosa infection
when compared with BALB/c and DBA/2 strains. The decrease in the bacterial
load seen early after infection coincided with a steady and strong
recruitment of inflammatory cells to the bronchoalveolar spaces of mice of
the resistant BALB/c strain. On the other hand, the recruitment of
inflammatory cells to the lungs of mice of the susceptible DBA/2 strain was
deficient, resulting in the failure to control bacterial multiplication.
Chemotactic factors, proinflammatory cytokines, and the number and function
of recruited inflammatory cells may play major roles in the determination
of the genetic resistance to lung infection with P. aeruginosa in a normal
immunocompetent host.
Copyright © 1995, American Society for Microbiology
Endobronchial inflammation following Pseudomonas aeruginosa infection in resistant and susceptible strains of mice
McGill Centre for the Study of Host Resistance, Montreal General Hospital Research Institute, Quebec, Canada.
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