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Comparison of endotoxin release by different antimicrobial agents and the effect on inflammation in experimental
I R Friedland1, H Jafari, S Ehrett
1Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas 75235-9063.
Abstract:
In a rabbit Escherichia coli meningitis model, endotoxin liberation and concentrations of leukocytes, tumor necrosis factor (TNF), and lactate were compared after a single intravenous dose of cefotaxime, cefpirome, meropenem, chloramphenicol, or gentamicin. These antibiotics caused a 2- to 10-fold increase in cerebrospinal fluid concentrations of free (filterable) endotoxin within 2 h of starting treatment. By contrast, free endotoxin concentrations increased almost 100-fold in untreated animals 4 h later as bacteria continued to multiply. An initial enhancement of inflammation in the central nervous system occurred in all treatment groups compared with untreated controls. No significant differences were observed between treatment groups except for lower TNF concentrations in chloramphenicol-treated animals. Antibiotic therapy in E. coli meningitis, irrespective of the agent used, may result in an increase in free endotoxin and enhancement of inflammation, but the amount of endotoxin liberated is considerably smaller than that shed by untreated bacteria.
Insights
Antibiotic treatment for Escherichia coli meningitis in rabbits increased free endotoxin and central nervous system inflammation. However, the endotoxin released was less than in untreated bacterial meningitis.
Area of Science:
- Microbiology
- Pharmacology
- Neuroscience
Background:
- Escherichia coli meningitis is a serious infection.
- Antibiotic treatment is crucial but may have adverse effects.
- Understanding endotoxin release during treatment is important for managing inflammation.
Purpose of the Study:
- To compare endotoxin liberation and inflammatory markers in a rabbit model of E. coli meningitis treated with different antibiotics.
- To assess the impact of cefotaxime, cefpirome, meropenem, chloramphenicol, and gentamicin on cerebrospinal fluid (CSF) endotoxin, leukocytes, tumor necrosis factor (TNF), and lactate.
- To evaluate the inflammatory response in the central nervous system (CNS) following antibiotic administration.
Main Methods:
- A rabbit model of E. coli meningitis was established.
- Animals received a single intravenous dose of cefotaxime, cefpirome, meropenem, chloramphenicol, or gentamicin.
- CSF concentrations of free endotoxin, leukocytes, TNF, and lactate were measured at various time points.
- Untreated animals served as controls.
Main Results:
- All tested antibiotics caused a 2- to 10-fold increase in CSF free endotoxin within 2 hours.
- Untreated animals showed a nearly 100-fold increase in free endotoxin by 4 hours.
- An initial enhancement of CNS inflammation was observed in all antibiotic treatment groups compared to controls.
- Chloramphenicol treatment resulted in lower TNF concentrations compared to other antibiotics.
Conclusions:
- Antibiotic therapy for E. coli meningitis, regardless of the agent, can lead to increased free endotoxin and enhanced CNS inflammation.
- The amount of endotoxin liberated by antibiotic treatment is significantly less than that released by untreated multiplying bacteria.
- These findings highlight a potential mechanism for antibiotic-induced inflammatory exacerbation in bacterial meningitis.