The present study was undertaken to investigate whether less pathogenic Candida species (C. tropicalis, C. stellatoidea, C. krusei and C. glabrata) express a fibronectin receptor (FNr) antigenically related to alpha 5 beta 1 integrin, which mediates their binding to fibronectin (FN). By flow cytometric analysis, a monoclonal antibody (MAb) directed against human alpha 5 integrin subunit (clone SAM-1) and two different antisera to FNr positively stained C. tropicalis, C. stellatoidea and C. glabrata, with the greatest expression observed for C. tropicalis. No or only marginal immunoreactivity was found on C. krusei. C. tropicalis, C. stellatoidea, C. glabrata, but not C. krusei yeasts specifically adhered to FN; higher levels of adhesion were found for C. tropicalis and C. stellatoidea with respect to C. glabrata. Less pathogenic Candida spp. bound to the Arg-Gly-Asp (RGD) containing 120-kDa fragment of FN and adhesion to intact FN was markedly inhibited by Gly-Arg-Gly-Asp-Ser-Pro (GRGDSP), but not by Gly-Arg-Gly-Glu-Ser-Pro (GRGESP) peptides. In addition, anti-alpha 5 SAM-1 MAb and both anti-FNr antisera strongly blocked binding of less pathogenic Candida spp. to FN. Overall, these results indicate that less pathogenic Candida spp., including C. tropicalis, C. stellatoidea and C. glabrata, express a receptor antigenically related to alpha 5 beta 1 integrin which mediates their adhesion to FN.
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