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Long Term Chronic Pseudomonas aeruginosa Airway Infection in Mice
Published on: March 17, 2014
PERSISTENCE OF INSPIRED BACTERIA IN THE LUNGS OF ALCOHOLIZED MICE
1Hospital of The Rockefeller Institute for Medical Research.
Abstract:
1. When mice are exposed to an atmosphere containing certain bacteria in the form of a fine mist, the bacteria may be recovered from the deeper respiratory passages. 2. Pneumococci which have reached the lungs of normal mice as a result of this procedure usually disappear within a few hours and give rise to no generalized infection. In mice intoxicated with alcohol, on the other hand, pneumococci persist in the lungs for a longer period and fatal speticemia frequently follows. 3. Hemolytic streptococci and Bacillus influenzae generally persist in the lungs for about 24 hours. In intoxicated mice these organisms do not disappear so rapidly from the lungs and generalized infection is much more frequent. 4. The experiments yield no evidence as to how alcoholic intoxication renders the lungs more permeable to inspired bacteria.
Insights
Alcohol intoxication impairs the lungs' ability to clear bacteria, increasing infection risk. This study shows intoxicated mice experience prolonged bacterial presence and more frequent fatal infections compared to normal mice.
Area of Science:
- Microbiology
- Toxicology
- Immunology
Background:
- The respiratory system possesses defense mechanisms to clear inhaled microorganisms.
- Bacterial infections of the lungs can lead to severe systemic illness.
Purpose of the Study:
- To investigate the impact of acute alcohol intoxication on the lung's ability to clear bacteria.
- To determine if alcohol intoxication increases susceptibility to bacterial pneumonia and sepsis.
Main Methods:
- Mice were exposed to bacterial mists (Pneumococci, Hemolytic streptococci, Bacillus influenzae).
- Bacterial persistence in the lungs was assessed in both normal and alcohol-intoxicated mice.
- Outcomes such as generalized infection and septicemia were monitored.
Main Results:
- In normal mice, bacteria were cleared from the lungs within hours to a day.
- Alcohol-intoxicated mice showed prolonged bacterial persistence in the lungs.
- Fatal septicemia was more frequent in alcohol-intoxicated mice across different bacterial exposures.
Conclusions:
- Alcohol intoxication significantly compromises the lung's innate defense against bacterial pathogens.
- This impairment leads to increased bacterial load and a higher risk of severe, systemic infections like pneumonia and sepsis.
- The precise mechanism by which alcohol increases lung permeability to bacteria requires further investigation.
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