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Rokitamycin uptake by alveolar macrophages.
The Japanese Journal of Antibiotics
|July 1, 1988
Summary
New macrolide antibiotic rokitamycin (RKM) shows massive and rapid uptake by rabbit alveolar macrophages, exceeding other macrolides. This enhanced cellular penetration suggests RKM may be highly effective for intracellular infections.
Area of Science:
- Pharmacology
- Cell Biology
- Infectious Diseases
Background:
- Intracellular antibiotic penetration is crucial for treating infections caused by intracellular pathogens.
- Macrolides and clindamycin are known for their high intracellular uptake.
- Understanding cellular uptake mechanisms is key to optimizing antibiotic therapy.
Purpose of the Study:
- To investigate the intracellular uptake of rokitamycin (RKM), a novel oral macrolide, by rabbit alveolar macrophages.
- To compare the cellular penetration of RKM with two other macrolides: erythromycin and josamycin.
- To determine the effect of temperature on macrolide uptake by macrophages.
Main Methods:
- Rabbit alveolar macrophages were used to study the uptake of RKM, erythromycin, and josamycin.
- Macrolide concentrations were measured intracellularly and extracellularly after incubation.
- Uptake experiments were conducted at 37°C and 4°C to assess temperature dependence.
Main Results:
- Erythromycin and josamycin showed intracellular to extracellular concentration ratios (I/E) of approximately 20 and 40, respectively.
- Rokitamycin (RKM) exhibited significantly higher uptake, with an I/E ratio of approximately 120.
- Macrolide uptake by macrophages was reduced to about 10% at 4°C compared to 37°C, indicating temperature-dependent accumulation.
Conclusions:
- Rokitamycin (RKM) is rapidly and massively accumulated by alveolar macrophages.
- The cellular accumulation of RKM is dependent on temperature.
- These findings suggest that RKM may offer superior therapeutic efficacy for intracellular bacterial infections.