OBJECTIVE: To observe the effect of metformin on the tight junction of intestinal epithelial cells and its relevant mechanism. MATERIALS AND METHODS: Caco-2 cell monolayers were incubated with or without tumor necrosis factor-α (TNF-α) (10 ng/mL) in the absence or presence of indicated concentrations of metformin. Transepithelial electrical resistance (TEER) was measured at various time points. Caco-2 cell permeability was assessed using fluorescein permeability test. Immunofluorescence was used to detect the distribution of tight junction protein. Western blotting and Real-Time PCR were used to detect the expression of tight junction protein and Myosin light chain kinase (MLCK)-Myosin light chain (MLC) signaling pathway. RESULTS: Metformin attenuates the effects of TNF-α on Caco-2 cell TEER and paracellular permeability, prevents TNF-α-induced morphological disruption of tight junctions, ameliorates the inhibiting effect of TNF-α on epithelial tight junction-related protein expression and suppresses the TNF-α-induced increase in MLCK production. CONCLUSIONS: Metformin can stabilize and up-regulate tight junction protein by inhibiting MLCK-MLC signaling pathway, thus ameliorating the tight junction of intestinal epithelial cells.
OBJECTIVE: To observe the effect of metformin on the tight junction of intestinal epithelial cells and its relevant mechanism. MATERIALS AND METHODS: Caco-2 cell monolayers were incubated with or without tumor necrosis factor-α (TNF-α) (10 ng/mL) in the absence or presence of indicated concentrations of metformin. Transepithelial electrical resistance (TEER) was measured at various time points. Caco-2 cell permeability was assessed using fluorescein permeability test. Immunofluorescence was used to detect the distribution of tight junction protein. Western blotting and Real-Time PCR were used to detect the expression of tight junction protein and Myosin light chain kinase (MLCK)-Myosin light chain (MLC) signaling pathway. RESULTS:Metformin attenuates the effects of TNF-α on Caco-2 cell TEER and paracellular permeability, prevents TNF-α-induced morphological disruption of tight junctions, ameliorates the inhibiting effect of TNF-α on epithelial tight junction-related protein expression and suppresses the TNF-α-induced increase in MLCK production. CONCLUSIONS:Metformin can stabilize and up-regulate tight junction protein by inhibiting MLCK-MLC signaling pathway, thus ameliorating the tight junction of intestinal epithelial cells.
Authors: Q R Ducarmon; R D Zwittink; B V H Hornung; W van Schaik; V B Young; E J Kuijper Journal: Microbiol Mol Biol Rev Date: 2019-06-05 Impact factor: 11.056
Authors: Kosta J Popović; Dušica J Popović; Dejan Miljković; Dušan Lalošević; Ivan Čapo; Jovan K Popović Journal: Oncol Lett Date: 2019-06-21 Impact factor: 2.967