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We observed that Blastocystis ST-7 (B)-induced, time-dependent decrease in TER was significantly inhibited by pretreatment of monolayers with http://www.selleckchem.com/products/Neratinib(HKI-272).html ROCK inhibitors, Y-27632 and Fasudil (Fig.?2A) (P? http://www.selleckchem.com/products/Roscovitine.html cysteine proteases also involves actin cytoskeleton and ZO-1 reorganization. We observed that Blastocystis ST-7 (B) induced reorganization of actin cytoskeleton and ZO-1 in Caco-2 monolayers (Fig.?3A and B). Confocal micrographs revealed that exposure of Caco-2 monolayers to ST-7 (B) lysates induced a decrease in anti-ZO-1 antibody binding to the apical junctional ring of epithelium when compared to negative controls (Fig.?3B and C). A reorganization of epithelial F-actin was also observed in ST-7 (B)-treated monolayers (Fig.?3A and B). Loss of Caco-2 tight junction protein, ZO-1, and rearrangement of actin cytoskeleton, was prevented by pretreatment of Blastocystis ST-7 (B) lysate with cysteine protease inhibitor E-64 (Fig.?3B and C). Epithelial ROCK inhibition by both Y-27632 and Fasudil prevented parasite-induced reorganization of actin cytoskeleton and ZO-1 (Fig.?3B and C) as well. ZO-1 intensity at the apical junctional region after Blastocystis ST-7 (B) treatment was also significantly inhibited by pretreatment of epithelial monolayers with both Y-27632 and Fasudil (Fig.?3C) (P? https://en.wikipedia.org/wiki/Quinapyramine induces phosphorylation of MLC at ser-19 position resulting in its activation (Kosako et?al., 2000; Gavard and Gutkind, 2008). MLC activation leads to reorganization of actin cytoskeleton and tight junction complex anchored to it, leading to epithelial barrier dysfunction (Kosako et?al., 2000; Gavard and Gutkind, 2008). In this study we assessed whether Blastocystis cysteine proteases phosphorylate MLC to increase epithelial permeability. Western blot analysis suggested that Blastocystis ST-7 (B) causes a significant increase in phosphorylation of MLC in Caco-2 epithelium (Fig.?4) (P?