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Uptake of itraconazole by alveolar macrophages
J R Perfect1, D V Savani, D T Durack
1Department of Medicine, Duke University Medical Center, Durham, North Carolina 27710.
Abstract:
Itraconazole is a broad-spectrum potent triazole antifungal agent. Its efficacy in treatment cannot always be explained by body fluid drug levels. In this study, itraconazole was shown to accumulate into host cells. Its intracellular accumulation in cells is greater than that of the antibacterial agent clindamycin, which is known for intracellular localization, and the uptake process does not appear to be active. This ability to reach high concentrations intracellularly may be an important property for the in vivo efficacy of itraconazole.
Insights
Itraconazole, a potent antifungal, accumulates in host cells, exceeding levels seen with clindamycin. This intracellular accumulation may explain its effectiveness in treating infections.
Area of Science:
- Pharmacology
- Mycology
- Cell Biology
Background:
- Itraconazole is a broad-spectrum triazole antifungal.
- Its clinical efficacy sometimes exceeds predictions based on blood concentrations.
Purpose of the Study:
- To investigate the intracellular accumulation of itraconazole.
- To compare itraconazole's cellular uptake with that of clindamycin.
Main Methods:
- Cellular accumulation assays were performed.
- Uptake kinetics were analyzed.
Main Results:
- Itraconazole demonstrates significant accumulation within host cells.
- Intracellular itraconazole concentrations were higher than those of clindamycin.
- The uptake mechanism appears to be passive.
Conclusions:
- Itraconazole achieves high intracellular concentrations.
- This cellular accumulation is a potential key factor in its in vivo antifungal activity.