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Different effects of native Candida albicans mannan and mannan-derived oligosaccharides on antigen-stimulated lymphoproliferation in vitro.

R P Podzorski, G R Gray and R D Nelson
J Immunol January 15, 1990, 144 (2) 707-716;
R P Podzorski
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G R Gray
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R D Nelson
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Abstract

Yeast cell wall mannan polysaccharide has been proposed to contribute to immune dysfunction associated with chronic infections involving Candida albicans. This influence of mannan has been suggested based partially upon studies of the in vitro immunoinhibitory effects of mannans prepared from Saccharomyces cerevisiae or C. albicans by precipitation with Fehling's reagent, which provides a structurally modified product contaminated with copper. We have therefore evaluated the immunoinhibitory influence of a more native C. albicans mannan prepared by complexation with cetyltrimethylammonium bromide (CTAB). CTAB mannan was a potent stimulator of lymphoproliferation when added to human PMBC from donors responsive to Candida; it has no inhibitory influence on lympho-proliferation induced by Candida or other Ag. In contrast, members of a family of mannose oligosaccharides (disaccharide through hexasaccharide) derived from the CTAB mannan by weak alkaline degradation did not stimulate lymphoproliferation, but were potent inhibitors of lymphoproliferation stimulated by Candida and other Ag. Fifty percent inhibitory doses were 260 to 34 microM, respectively. Compositional analyses of these immunoinhibitory oligomers showed them to be composed of mannose and free of contaminating protein. We propose that mannan-derived oligosaccharides produced by catabolism of mannan in vivo are immunoinhibitory and contribute to the deficit in cell-mediated immune function associated with chronic candidiasis.

  • Copyright © 1990 by American Association of Immunologists

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The Journal of Immunology
Vol. 144, Issue 2
15 Jan 1990
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Different effects of native Candida albicans mannan and mannan-derived oligosaccharides on antigen-stimulated lymphoproliferation in vitro.
R P Podzorski, G R Gray, R D Nelson
The Journal of Immunology January 15, 1990, 144 (2) 707-716;

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Different effects of native Candida albicans mannan and mannan-derived oligosaccharides on antigen-stimulated lymphoproliferation in vitro.
R P Podzorski, G R Gray, R D Nelson
The Journal of Immunology January 15, 1990, 144 (2) 707-716;
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Print ISSN 0022-1767        Online ISSN 1550-6606