Effects of lipid formulations of amphotericin B on activity of human monocytes against Aspergillus fumigatus

J. Dotis, M. Simitsopoulou, M. Dalakiouridou, T. Konstantinou, A. Taparkou, F. Kanakoudi-Tsakalidou, T. J. Walsh, E. Roilides

Research output: Contribution to journalArticlepeer-review


The immunomodulatory effects of liposomal amphotericin B (LAMB), amphotericin B lipid complex, and amphotericin B colloidal dispersion (ABCD) on antifungal activity of human monocytes (MNCs), an important component of antifungal host defense, against Aspergillus fumigatus were compared to those of deoxycholate amphotericin B (DAMB). MNCs from healthy volunteers were incubated with 1 or 5 μg/ml DAMB and 5 or 25 μg/ml lipid formulations for 22 h. Drug-pretreated or untreated MNCs were then washed and assayed for the following: (i) activity against A. fumigatus hyphae by XTT assay at MNC:hypha ratios of 10:1 and 20:1; (ii) production of superoxide anion (O2 -) from MNCs in response to hyphae by cytochrome c reduction; (iii) production of hydrogen peroxide (H2O2) and H 2O2-dependent intracellular intermediates (DIIs), such as OH- and HOC1, from MNCs in response to A. fumigatus culture supernatant by flow cytometric measurement of dihydrorhodamine-1,2,3 oxidation. With the exception of 1 μg/ml DAMB and 5 μg/ml LAMB or ABCD at 10:1, all amphotericin B formulations at both concentrations and MNC:hypha ratios enhanced MNC-induced damage of A. fumigatus hyphae compared to results with untreated cells (P < 0.01). While MNC O2- production upon hyphal challenge, an early event in oxidative burst, was not affected by the drugs, production of H2O2 and DIIs, late events, were significantly increased by all four drugs (P < 0.01). At clinically relevant concentrations, both conventional amphotericin B and its lipid formulations enhance antihyphal activity of MNCs against A. fumigatus in association with significant augmentation of H2O2 and DIIs but not O 2-, further demonstrating the immunomodulaton antifungal activities of these agents.

Original languageEnglish (US)
Pages (from-to)868-873
Number of pages6
JournalAntimicrobial agents and chemotherapy
Issue number3
StatePublished - Mar 2006
Externally publishedYes

ASJC Scopus subject areas

  • Pharmacology
  • Pharmacology (medical)
  • Infectious Diseases


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