Related Experiment Videos
Antimicrobial susceptibility of Pneumocystis carinii in culture
Abstract:
Pneumocystis carinii from infected rats were cultured on infected WI-38 human lung fibroblasts. After cultures were established, medium was replaced by medium containing antimicrobials and supernate organisms counted at specified times. Results show that metronidazole had no effect, amphotericin B suppressed organisms at 5 but not 0.5 microgram/ml, and miconazole, chloroquine, trimethoprim-sulfamethoxazole, and pentamidine isethionate suppressed organisms at the concentrations tested.
Insights
Metronidazole was ineffective against Pneumocystis carinii. Amphotericin B showed some effect, while miconazole, chloroquine, trimethoprim-sulfamethoxazole, and pentamidine isethionate effectively suppressed these organisms in vitro.
Area of Science:
- Medical Mycology
- Infectious Diseases
- Antimicrobial Research
Background:
- Pneumocystis carinii is an opportunistic pathogen causing pneumonia in immunocompromised individuals.
- Effective in vitro antimicrobial susceptibility testing is crucial for guiding clinical treatment strategies.
- WI-38 human lung fibroblasts provide a relevant model for studying P. carinii interactions.
Purpose of the Study:
- To evaluate the in vitro efficacy of various antimicrobial agents against Pneumocystis carinii.
- To determine the minimum inhibitory concentrations or effective concentrations of selected drugs.
- To identify potential therapeutic options for Pneumocystis pneumonia.
Main Methods:
- Culturing Pneumocystis carinii isolated from infected rats on WI-38 human lung fibroblasts.
- Exposing established cultures to different concentrations of antimicrobial agents.
- Quantifying viable Pneumocystis carinii organisms in culture supernatants over time.
Main Results:
- Metronidazole demonstrated no significant inhibitory effect on Pneumocystis carinii growth.
- Amphotericin B exhibited suppressive activity at 5 microgram/ml but not at 0.5 microgram/ml.
- Miconazole, chloroquine, trimethoprim-sulfamethoxazole, and pentamidine isethionate effectively suppressed organism growth at tested concentrations.
Conclusions:
- Several antimicrobial agents show promise for treating P. carinii infections.
- Trimethoprim-sulfamethoxazole and pentamidine isethionate are confirmed effective in vitro.
- Further investigation into amphotericin B's efficacy at varying concentrations is warranted.