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- W2062007178 abstract "Wheat germ agglutinin (WGA) is a plant protein that binds specifically to sugars expressed also by gastrointestinal epithelial cells. WGA is currently investigated as an anti-tumor drug and as a carrier for oral drugs. Information on whether it can cross the gastrointestinal epithelium and on its possible effects on the integrity of the epithelial layer is however scanty or lacking, and herein we address these issues. Differentiated Caco2 cells have been used as a model of polarized intestinal epithelium. WGA concentration at both the apical and the basolateral side of the epithelium has been quantified using a sensitive ELISA assay (sensitivity threshold 0.84 nM). Trans epithelial electrical resistance (TEER) has been measured to evaluate the integrity of the epithelium upon treatments with WGA. (3)H-Mannitol (182.2 Da) and FITC-dextran (3000 Da) have been used to measure the permeability of the epithelium. Cell viability has been measured by the MTT, by 7-AAD uptake, and Annexin-V binding assays. Up to a concentration of 5.6 microM, approximately 0.1% of intact WGA molecules only could cross the epithelial layer. WGA perturbed the integrity of the epithelium and increased the permeability of the tissue in a dose- and time-dependent manner. WGA did not induce cell death but increased the permeability of individual cells to 7-AAD which is normally not uptaken by viable cells. These data allowed us to define a toxicity threshold for WGA on epithelial cells. WGA suitability as a carrier for oral drugs can therefore be evaluated on a rational basis." @default.
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- W2062007178 date "2005-09-01" @default.
- W2062007178 modified "2023-09-27" @default.
- W2062007178 title "Plant lectins as carriers for oral drugs: Is wheat germ agglutinin a suitable candidate?" @default.
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- W2062007178 doi "https://doi.org/10.1016/j.taap.2005.01.001" @default.
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