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Cellular uptake of clindamycin and lincomycin
British Journal of Experimental Pathology
|December 1, 1984
Summary
Neither clindamycin nor lincomycin effectively killed intracellular Staphylococcus aureus within four hours. Despite high intracellular antibiotic concentrations, slow killing rates may explain this failure, with prolonged exposure causing neutrophil damage.
Area of Science:
- Microbiology
- Pharmacology
- Cell Biology
Background:
- Intracellular pathogens pose treatment challenges.
- Staphylococcus aureus can reside within host cells.
- Clindamycin and lincomycin are antibiotics used against S. aureus.
Purpose of the Study:
- To investigate the efficacy of clindamycin and lincomycin against intracellular Staphylococcus aureus.
- To determine the intracellular accumulation and activity of these antibiotics within neutrophils.
- To understand the limitations of these antibiotics in treating intracellular bacterial infections.
Main Methods:
- Incubation of neutrophils with S. aureus and antibiotics (clindamycin, lincomycin).
- Bio-assay of neutrophil sonicates to measure intracellular antibiotic concentrations.
- Assessment of bacterial killing over a 4-hour period.
- Observation of neutrophil viability over extended periods.
Main Results:
- Clindamycin and lincomycin did not kill intracellular S. aureus within 4 hours.
- Active clindamycin was found at intracellular neutrophil concentrations approximately 20 times higher than extracellular levels.
- Slow killing kinetics of S. aureus by these antibiotics were observed in vitro.
- Prolonged incubation (20 hours) led to significant neutrophil lysis.
Conclusions:
- High intracellular concentrations do not guarantee rapid killing of intracellular S. aureus by clindamycin and lincomycin.
- Slow antibiotic killing rates and neutrophil instability limit their effectiveness against intracellular S. aureus.
- Further strategies are needed to enhance antibiotic activity against intracellular bacteria.