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Infection and Immunity, January 2004, p. 209-218, Vol. 72, No. 1
0019-9567/04/$08.00+0     DOI: 10.1128/IAI.72.1.209-218.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Biological Activities of Naturally Occurring Antibodies Reactive with Candida albicans Mannan

Thomas R. Kozel,^* Randall S. MacGill, Ann Percival, and Qing Zhou

Department of Microbiology and Immunology and the Cell and Molecular Biology Program, University of Nevada School of Medicine, Reno, Nevada 89557

Received 14 July 2003/ Returned for modification 21 August 2003/ Accepted 15 October 2003

Sera from normal adult humans may contain high levels of antibody reactive with Candida albicans mannan. This study examined selected biological activities of such antibodies, focusing on sera that were collected from 34 donors and analyzed individually. The results showed that antimannan titers were normally distributed. Reactivity as determined by enzyme-linked immunosorbent assay with serotype A mannan generally paralleled reactivity with serotype B. Analysis of the kinetics for activation of the complement system and deposition of complement component 3 (C3) onto serotype A and serotype B cells showed a decrease in the lag time that occurred before the onset of rapid accumulation of C3 that correlated with increasing antimannan titers. In contrast, there was a decrease in the overall rate of accumulation of C3 on serotype A cells that was strongly correlated with increasing antibody titers; serotype B cells showed no such decrease. An evaluation of the contribution of mannan antibody to opsonophagocytic killing showed that mannan antibody in individual sera and antimannan immunoglobulin G (IgG) affinity purified from human plasma contributed to killing by neutrophils in a dose-dependent fashion in the absence of a functional complement system. However, affinity-purified antibody in very high concentrations was inhibitory to both complement-dependent and complement-independent opsonophagocytosis, and this finding suggests a prozone-like effect. In contrast, if the complement system was functional, antimannan IgG was not needed for opsonophagocytic killing. These results suggest that naturally occurring mannan antibodies and the complement system are functionally redundant for opsonophagocytic killing by neutrophils.

Editor: J. T. Barbieri

Present address: GenVec, Ind., Gaithersburg, MD 20878.

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