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. 1994 Jan;38(1):13–22. doi: 10.1128/aac.38.1.13

Novel aspect of amphotericin B action: accumulation in human monocytes potentiates killing of phagocytosed Candida albicans.

E Martin 1, A Stüben 1, A Görz 1, U Weller 1, S Bhakdi 1
PMCID: PMC284390  PMID: 8141565

Abstract

The influence of low doses of amphotericin B on the capacity of human monocytes to kill Candida albicans was investigated. Killing rates were quantified by a novel flow cytometric assay and were found to be 37% +/- 3% (standard error of the mean) after 3 h. Preincubation of monocytes for 6 to 20 h with low concentrations of amphotericin B (0.2 microgram/ml) resulted in a markedly augmented fungicidal capacity. Enhancement of killing was 80% +/- 11% (standard error of the mean) over that by the controls. This effect did not appear to be due to amphotericin B-dependent monocyte activation; the respiratory burst and expression of human leukocyte antigen-DR were unaltered, and no stimulation of interleukin-1 beta release occurred. Cell-associated amphotericin B was extracted with acetonitrile and was quantified by scanning spectrophotometry. Amphotericin B appeared to accumulate in the cells, and intracellular concentrations attained after overnight incubation in 1 microgram of the drug per ml were estimated to be in the range of 50 fg per cell. The fact that intracellular accumulation was responsible for the enhanced fungicidal capacity of monocytes was supported by the findings that killing of Staphylococcus aureus remained normal and enhancement of killing of an amphotericin B-resistant C. albicans strain was minimal. Dramatic enhancement of monocyte fungicidal capacity probably extends to other amphotericin B-susceptible fungi and could represent a hitherto unrecognized determinant underlying the curative properties and prophylactic efficacy of this drug.

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Selected References

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