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Pentoxifylline modulates meningeal inflammation in experimental bacterial meningitis
X Sáez-Llorens1, O Ramilo, M M Mustafa
1Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas 75235.
Abstract:
Pentoxifylline has been shown to decrease endotoxin-induced tumor necrosis factor alpha production and reverse the inflammatory actions of interleukin-1 (IL-1) and tumor necrosis factor on leukocyte function. Because of the potential role of this cytokine-leukocyte interaction in the pathogenesis of bacterial meningitis, we investigated the ability of pentoxifylline to modulate meningeal inflammation in the rabbit meningitis model. Pentoxifylline treatment (initially an intravenous injection of 20 mg/kg followed by 6 mg/kg per h) started 20 min before intracisternal injection of 20 ng of Haemophilus influenzae type b lipooligosaccharide (endotoxin) reduced significantly concentrations in cerebrospinal fluid of leukocytes (P less than 0.0001), protein (P less than 0.001), and lactate (P less than 0.001) during the 9-h infusion compared with values in intravenous-saline-treated rabbits. When pentoxifylline was given 1 h after H. influenzae type b endotoxin, the mean peak lactate and leukocyte concentrations in cerebrospinal fluid were significantly lower than those in control animals. Pentoxifylline also significantly decreased lactate and protein concentrations (P less than 0.05) and tended to diminish leukocyte counts (P = 0.08) compared with results in control animals after antibiotic-induced release of endotoxin in animals with H. influenzae meningitis. In this regard, dexamethasone was superior to pentoxifylline and no synergism was observed when the drugs were combined. Additionally, pentoxifylline attenuated meningeal inflammatory changes induced by intracisternal inoculation of 10 ng of rabbit recombinant IL-1 beta compared with results in either dexamethasone- or saline-treated animals. We conclude that pentoxifylline is effective in this animal model in modulating the meningeal inflammatory response following intracisternal inoculation of H. influenzae type b endotoxin or organisms or rabbit recombinant IL-1beta.
Insights
Pentoxifylline effectively reduces inflammation in a rabbit meningitis model by lowering key inflammatory markers. This study shows its potential in managing bacterial meningitis by modulating cytokine-leukocyte interactions.
Area of Science:
- Neuroscience
- Pharmacology
- Immunology
Background:
- Bacterial meningitis involves complex cytokine-leukocyte interactions.
- Tumor necrosis factor alpha and interleukin-1 play significant roles in meningeal inflammation.
- Pentoxifylline is known to modulate inflammatory responses.
Purpose of the Study:
- To investigate pentoxifylline's efficacy in modulating meningeal inflammation in a rabbit meningitis model.
- To assess the impact of pentoxifylline on endotoxin- and cytokine-induced inflammatory markers.
Main Methods:
- Rabbits were treated with pentoxifylline before or after Haemophilus influenzae type b endotoxin administration.
- Cerebrospinal fluid (CSF) analysis measured leukocyte, protein, and lactate concentrations.
- Inflammatory responses to interleukin-1 beta were also evaluated.
Main Results:
- Pentoxifylline significantly reduced CSF leukocytes, protein, and lactate levels post-endotoxin challenge.
- Early and delayed pentoxifylline administration both showed beneficial effects.
- Pentoxifylline attenuated inflammation induced by interleukin-1 beta, outperforming dexamethasone in some aspects.
Conclusions:
- Pentoxifylline effectively modulates meningeal inflammation in an animal model of bacterial meningitis.
- It impacts key inflammatory mediators like endotoxin and interleukin-1 beta.
- Pentoxifylline shows therapeutic potential for bacterial meningitis treatment.