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. 1994 Aug;62(8):3138–3145. doi: 10.1128/iai.62.8.3138-3145.1994

Candida albicans stimulates arachidonic acid liberation from alveolar macrophages through alpha-mannan and beta-glucan cell wall components.

M Castro 1, N V Ralston 1, T I Morgenthaler 1, M S Rohrbach 1, A H Limper 1
PMCID: PMC302938  PMID: 8039882

Abstract

Candida albicans is an increasingly important fungal pathogen. Alveolar macrophages respond to fungal components such as zymosan by releasing arachidonic acid (AA) and AA metabolites. However, few studies hypothesized that macrophages respond to C. albicans by releasing AA and generating AA metabolites as a consequence of interaction of mannose and beta-glucan receptors with fungal cell wall components. [14C]AA-labeled rabbit alveolar macrophages released AA following stimulation with either live or heat-killed C. albicans. High-pressure liquid chromatography analysis revealed that 55% of the AA released was metabolized via cyclooxygenase and lipoxygenase pathways. The metabolites consisted of prostaglandin E2, prostaglandin F2 alpha, 6-ketoprostaglandin F1 alpha, thromboxane B2, and leukotrienes B4 and D4. We further examined the roles of alpha-mannan and beta-glucan components of C. albicans in mediating these alterations of eicosanoid metabolism. Prior work in our laboratory has shown that soluble alpha-mannan and beta-glucan inhibit macrophage mannose and beta-glucan receptors, respectively. Incubation of alveolar macrophages with soluble alpha-mannan derived from C. albicans (1 mg/ml) resulted in 49.8% +/- 2.6% inhibition of macrophage AA release during stimulation with intact C. albicans (P = 0.0001 versus control). Macrophage AA release in response to C. albicans was also inhibited to a significant but lesser degree by soluble beta-glucan (36.2% +/- 1.3%; P = 0.008 versus control). These results indicate that C. albicans stimulates macrophage AA metabolism and that these effects are partly mediated by alpha-mannan and beta-glucan constituents of the fungus.

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Selected References

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