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Biochemical alterations in the mouse induced by Pseudomonas aeruginosa and its slime glycolipoprotein
Abstract:
Mice, injected with either live cells of Pseudomonas aeruginosa, or its slime glycolipoprotein (GLP), developed similar lethal syndromes. Within 14 h, biochemical changes in the sera, such as increased urea, aspartate aminotransferase, alanine aminotransferase, and creatinine, as well as decreased glucose, albumin, total protein, uric acid, and alkaline phosphatase, indicated liver and renal dysfunction. These marked alterations were in contrast with the minimal histopathological changes that occurred in these organs. Either live cell or GLP challenge also induced haemolysis in vivo. Immunization with GLP protected mice against most biochemical changes when challenged with live cells but did not protect GLP-challenged mice against the biochemical alterations assayed in the sera.
Insights
Pseudomonas aeruginosa slime glycolipoprotein (GLP) causes lethal syndromes and organ dysfunction in mice. GLP immunization protects against live bacteria but not GLP challenge, highlighting its toxicity.
Area of Science:
- Microbiology
- Toxicology
- Immunology
Background:
- Pseudomonas aeruginosa is an opportunistic pathogen.
- The bacterial slime glycolipoprotein (GLP) is a key virulence factor.
Purpose of the Study:
- To investigate the toxic effects of Pseudomonas aeruginosa GLP.
- To evaluate the protective efficacy of GLP immunization.
Main Methods:
- Mice were injected with live Pseudomonas aeruginosa or its GLP.
- Serum biochemistry and histopathology were analyzed.
- Haemolysis was assessed in vivo.
- Mice were immunized with GLP and challenged.
Main Results:
- Both live bacteria and GLP induced lethal syndromes and significant serum biochemical alterations indicative of liver and renal dysfunction within 14 hours.
- Histopathological changes in organs were minimal despite severe biochemical alterations.
- In vivo haemolysis was observed.
- GLP immunization conferred protection against biochemical changes induced by live P. aeruginosa but not against GLP challenge.
Conclusions:
- Pseudomonas aeruginosa GLP is a potent toxin causing systemic toxicity and organ dysfunction.
- GLP induces haemolysis in vivo.
- While GLP immunization offers protection against live bacteria, it does not protect against the toxic effects of GLP itself, suggesting a complex immune response or direct toxicity.