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. 1990 Mar;58(3):625–631. doi: 10.1128/iai.58.3.625-631.1990

A monoclonal antibody that defines a surface antigen on Candida albicans hyphae cross-reacts with yeast cell protoplasts.

M W Ollert 1, R A Calderone 1
PMCID: PMC258511  PMID: 1689699

Abstract

Female BALB/c mice were immunized with a whole-hyphal-cell extract obtained from Candida albicans wild-type strain 4918 grown in Lee medium. Monoclonal antibody (MAb)-producing hybridomas were prepared by fusing immune splenocytes with NS-1 myeloma cells. One of the hybrid cell clones (1.183) secreted an immunoglobulin G1 antibody that reacted with C. albicans hyphae in an indirect immunofluorescence assay but not with yeast cells and pseudohyphal segments directly originating from parent blastoconidia. In the same assay eight of nine recent clinical C. albicans isolates and Candida stellatoidea tested positive for hyphal cell-specific reactivity with MAb 1.183. The recognized antigen on hyphal cells was sensitive to heat treatment, beta-mercaptoethanol reduction, and proteolysis with pronase, trypsin, and subtilisin. Western blot (immunoblot) analysis of hyphal whole-cell and dithiothreitol extracts with MAb 1.183 revealed two major proteins with approximate molecular masses of 55 and 60 kilodaltons (kDa) under reducing conditions. Endo-alpha-N-acetylgalactosaminidase (O-glycanase) treatment reduced the molecular mass of the 60-kDa protein slightly but did not affect recognition by MAb 1.183, whereas peptide:N-glycosidase F (N-glycanase) had no effect on either protein. When exponentially growing yeast cells were treated sequentially with EDTA, beta-mercaptoethanol, and Zymolase to form protoplasts, a specific immunofluorescence signal was obtained with MAb 1.183. In a Western blot, MAb 1.183 showed reactivity with a 20-kDa protein in the sodium dodecyl sulfate extract from protoplasts, whereas no reactivity was found with cell wall material obtained from yeast cells. In summary, these experiments indicated that specific cell surface components from C. albicans hyphae are related to antigens which are present in yeast cells but are not detectable on the surface of the latter.

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Selected References

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