Effects of water-soluble beta-cyclodextrins (beta CDs) on intestinal epithelial integrity were investigated, to establish the safe use of these beta CDs as solubilizers of spironolactone in paediatric enteral solutions. Mannitol permeability and transepithelial resistance (TER) of human intestinal epithelial Caco-2 cell monolayers during exposure to dimethyl-beta-cyclodextrin (DM beta CD), hydroxypropyl-beta-cyclodextrin (HP beta CD) and sulphobutyl ether beta-cyclodextrin (SBE beta CD) were followed. Staining methods were used to discern cells with damaged membranes and to study the integrity of cytoskeletal actin and tight junctions. Cytotoxicity of the beta CDs was tested by effects on intracellular dehydrogenase activity. Exposure to HP beta CD and SBE beta CD solutions had only minor effects on the integrity of Caco-2 cell monolayers. In contrast, DM beta CD clearly increased the epithelial permeability for the hydrophilic marker [14C]mannitol across Caco-2 monolayers, decreased TER and showed a dose-dependent cytotoxicity. According to staining, DM beta CD increased the permeability of the apical cell membrane without discernable effects on cytoskeletal actin. HP beta CD and SBE beta CD appear to be safe additives for use in enteral spironolactone preparations with respect to their acute local effects on epithelial integrity.
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