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In Vitro
Journal Article
Clindamycin uptake by human neutrophils.
Journal of Infectious Diseases 1981 November
An anaerobic environment limits the microbicidal capacity of polymorphonuclear neutrophils (PMNs). To augment PMN killing under these conditions, the characteristics and mechanisms of clindamycin uptake by human PMNs were studied. The peak intracellular concentration of clindamycin was approximately 40 times greater than the extracellular concentration. Clindamycin uptake was rapid, saturable, and temperature-dependent. Intracellular accumulation of the drug was inhibited in acid pH, and agents that collapsed the transmembrane pH gradients also inhibited uptake. Isolated PMN lysosomes also accumulated clindamycin against a large concentration gradient, and uptake was reduced by collapsing the translysosomal membrane pH gradient. The intracellular drug was fully bioactive. These studies demonstrate that clindamycin is rapidly accumulated by PMNs, that drug uptake is related to a pH gradient, and that clindamycin appears to be lysosomotropic.
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