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Using an ex vivo binding assay, we previously demonstrated that yeast cells grown at 37 degrees C display binding specificity in mouse spleen, lymph node, and kidney tissues. In spleen and lymph node tissues, binding was predominantly in regions rich in macrophages. Here, we tested the possibility that hydrophobic and hydrophilic cells bind differentially to host tissues. Hydrophobic and hydrophilic yeast cells of four Candida albicans strains were incubated for 15 min at 4 degrees C with cryostat sections of organs that had been rapidly frozen after removal from BALB/cByJ mice. Unattached cells were removed by washing, and the sections were examined. Hydrophobic cells bound diffusely and abundantly to all tissues, while hydrophilic cell attachment was restricted to specific sites. For example, hydrophobic cells bound to the white and red pulp and the marginal zones in spleens, whereas hydrophilic cells attached primarily to the marginal zones. Hydrophobic yeast cells attached throughout lymph node tissue including paracortical areas, but hydrophilic cell attachment occurred primarily at the subcapsular and trabecular sinuses, EDTA inhibited the adherence of hydrophilic cells but not hydrophobic cells to mouse tissues. Hydrophobic C. albicans strains displaying similar levels of hydrophobicity differed quantitatively in their levels of attachment to kidney and spleen tissues, confirming our earlier observation that surface hydrophobicity is not the sole determinant in adherence to host cells. Other studies have shown that hydrophobic and hydrophilic cells display different virulence characteristics related to their surface properties and that hydrophobic cells are more virulent than hydrophilic cells. Taken together, the present results suggest that the enhanced virulence of hydrophobic cells over hydrophilic cells may be due, in part, to the potential of hydrophobic cells to bind throughout various organs following clearance from the bloodstream.

Differential adherence of hydrophobic and hydrophilic Candida albicans yeast cells to mouse tissues