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Antibiotic uptake by alveolar macrophages
The Journal of Laboratory and Clinical Medicine
|March 1, 1980
Summary
Certain antibiotics, like clindamycin and erythromycin, are highly concentrated within phagocytes, indicating effective intracellular bacterial infection treatment. This research explores antibiotic uptake mechanisms for improved therapy guidelines.
Area of Science:
- Pharmacology
- Microbiology
- Cell Biology
Background:
- Intracellular bacteria require antibiotics that penetrate phagocytic cells.
- Understanding antibiotic uptake by phagocytes is crucial for effective treatment.
Purpose of the Study:
- To investigate the characteristics of antibiotic entry into phagocytes.
- To identify antibiotics with significant intracellular accumulation.
Main Methods:
- Studied uptake of 14 radiolabeled antibiotics by rabbit alveolar macrophages (AM).
- Used velocity-gradient centrifugation to quantify antibiotic concentrations within cells.
- Assessed the impact of metabolic processes on antibiotic uptake.
Main Results:
- Most antibiotics showed limited penetration into AM.
- Lipid-soluble antibiotics like rifampin and chloramphenicol showed moderate uptake (C/E ≈ 2).
- Ethambutol, erythromycin, and clindamycin demonstrated significant accumulation (C/E > 20), with clindamycin uptake being rapid and massive (C/E = 50).
- Uptake of ethambutol, erythromycin, and clindamycin depends on oxidative metabolism, with clindamycin accumulation via active transport.
Conclusions:
- Antibiotic uptake by phagocytes varies significantly.
- Clindamycin, erythromycin, and ethambutol show high intracellular concentrations, suggesting potential for treating intracellular infections.
- Findings inform guidelines for optimal antibiotic selection and usage against intracellular pathogens.