PcrV immunization enhances survival of burned Pseudomonas aeruginosa-infected mice
I A Holder1, A N Neely, D W Frank
1Department of Microbiology, Shriners Hospital for Children, Cincinnati, Ohio 45229, USA. iaholder@juno.com
Abstract:
Burned Pseudomonas aeruginosa-infected mice immunized against PcrV, a type III virulence system translocating protein, showed significantly enhanced survival compared to controls. Survival was non-O serotype specific and correlated with a reduced systemic microbial load. Infection with a high-level toxin A-producing strain required supplemental antitoxin treatment to enhance survival.
Insights
Immunizing burned mice against Pseudomonas aeruginosa with PcrV enhanced survival by reducing bacterial load. Toxin A-producing strains required additional antitoxin for improved outcomes.
Area of Science:
- Microbiology
- Immunology
- Infectious Diseases
Background:
- Pseudomonas aeruginosa is an opportunistic pathogen causing severe infections, particularly in burn wound patients.
- The type III secretion system (T3SS) and its translocated proteins, like PcrV, are critical for P. aeruginosa virulence.
- PcrV is a key component of the T3SS needle complex and a target for vaccine development.
Purpose of the Study:
- To evaluate the efficacy of immunization against PcrV in a murine model of burn wound infection with P. aeruginosa.
- To determine if anti-PcrV immunity impacts systemic microbial load and survival.
- To assess the role of toxin A in P. aeruginosa pathogenesis and the need for adjunctive therapies.
Main Methods:
- A murine model of burn wound infection was established.
- Mice were immunized with PcrV prior to infection.
- Survival rates, systemic bacterial loads, and the impact of antitoxin treatment were assessed.
- Infections were performed using P. aeruginosa strains with varying levels of toxin A production.
Main Results:
- Immunization against PcrV significantly enhanced survival in burned, P. aeruginosa-infected mice compared to controls.
- Enhanced survival correlated with a reduced systemic microbial load and was independent of the O serotype.
- Infections with high-level toxin A-producing strains necessitated supplemental antitoxin treatment to improve survival.
Conclusions:
- Vaccination targeting PcrV offers a promising strategy to improve outcomes in P. aeruginosa burn wound infections.
- Anti-PcrV immunity effectively reduces systemic bacterial dissemination.
- The efficacy of anti-PcrV strategies may be influenced by other virulence factors, such as toxin A, requiring combination therapies.
