Water flux in tricellulin knockdown MDCK C7 cells stimulated by an osmotic gradient on the apical side of the cell layer. Water flux induced by a gradient of (a) 100 mM mannitol (n = 8–10), (b) 37 mM 4 kDa-dextran (n = 8–10) and (c) 100 mM 4 kDa-dextran (n = 6–9) was increased in both tricellulin knockdown clones, with the stronger increase in clone KD 24 with the higher reduction of tricellulin expression. Statistical analysis was performed using Student’s t-test between the KD clone and the corresponding control (KD 23 versus control 2, KD 24 versus control 9). (Control 2: ●; KD 23: ; Control 9: ◆; KD 24: . * p <0.05, ** p < 0.01, *** p < 0.001).