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Infect. Immun., Feb 1995, 569-572, Vol 63, No. 2
Copyright © 1995, American Society for Microbiology

Adherence of Candida albicans to human buccal epithelial cells: host- induced protein synthesis and signaling events

A Bailey, E Wadsworth and R Calderone
Department of Microbiology and Immunology, Georgetown University School of Medicine, Washington, D.C. 20007.

The synthesis of proteins by Candida albicans was studied following adherence of blastoconidia to human buccal epithelial cells (HBEC). Initially, labeling of HBEC, C. albicans, and HBEC-C. albicans with [35S]methionine was performed. After a 3-h incubation and prior to labeling with [35S]methionine, the cultures were treated with cycloheximide to prevent HBEC protein synthesis. The HBEC-C. albicans mixture as well as C. albicans and HBEC incubated separately were extracted with beta-mercaptoethanol (beta-ME). These extracts as well as the cell residue (solubilized by boiling with sodium dodecyl sulfate [SDS]) were examined by SDS-polyacrylamide gel electrophoresis and autoradiography. In comparison to cultures of C. albicans incubated without HBEC, proteins with molecular masses of approximately 52 to 56 kDa from beta-ME extracts and from SDS-solubilized cells were observed only from adhering cultures. In addition, unlabeled beta-ME extracts were electrotransferred to nitrocellulose and immunoblotted with antiphosphotyrosine antibodies to determine whether cell signaling events were occurring during adherence. Proteins with molecular masses of 54 and 60 kDa were recognized only in mixed cultures of C. albicans and HBEC. These data indicate that following adherence of C. albicans to HBEC, new Candida proteins are expressed. Further, these events are accompanied by the expression of signal proteins, presumably of Candida origin.


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