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. 1989 Dec;57(12):3876–3881. doi: 10.1128/iai.57.12.3876-3881.1989

Environmental alteration and phenotypic regulation of Candida albicans adhesion to plastic.

M J Kennedy 1, A L Rogers 1, R J Yancey Jr 1
PMCID: PMC259920  PMID: 2680985

Abstract

The adhesion of Candida albicans to plastic was examined after growth in two chemically defined media, Lee-Buckley-Campbell (LBC) and yeast nitrogen base (YNB), by binding isotherms, Langmuir isotherms, and Scatchard plots, and the number of binding sites (N) and the affinity constants (K) were calculated. K and N were twofold and fourfold higher, respectively, after growth in LBC compared with that in YNB. A comparison of adhesion in different assay solutions gave similar results, with the solution given to dehydrated patients (5% glucose in 0.45% NaCl [D5.45]) allowing for the highest K and the largest N. Scatchard curves for both LBC- and YNB-grown cells had negative slopes, which is supportive evidence for the view that negative cooperativity is involved in the binding process. Additional experiments to examine the role of cell surface hydrophobicity in adhesion to plastic were conducted with the white and opaque phenotypes of C. albicans. There was no significant difference in the adhesion of these phenotypes to plastic, although the opaque phenotype was significantly more hydrophobic. Adhesion, but not cell surface hydrophobicity, of both phenotypes was significantly greater in D5.45. Moreover, relatively hydrophilic mycelial forms of C. albicans were found to attach only when D5.45 was used as the assay medium and, in contrast to yeast-phase cells, were insensitive to reduced adhesion by nonionic detergents. These results suggest that the adhesion of C. albicans to plastic is regulated by environmental circumstances and the phenotypic state of the organism.

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Selected References

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