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http://dx.doi.org/10.5352/JLS.2016.26.9.1082

Inhibition of Interleukin-1α-induced Intestinal Epithelial Tight Junction Permeability by Curcumin Treatment in Caco-2 Cells in Caco-2 Cells  

Kim, Choon Young (Department of Food Science and Nutrition, Yeungnam University)
Publication Information
Journal of Life Science / v.26, no.9, 2016 , pp. 1082-1087 More about this Journal
Abstract
The intestinal tight junction (TJ) plays an important role as a paracellular barrier. Impaired TJ permeability and enhanced proinflammatory cytokine production are crucial pathophysiological mechanisms in inflammatory bowel diseases (IBDs). Although proinflammatory cytokines, tumor necrosis factor-alpha and interluekin-1 beta, which are markedly increased in IBD patients, have been reported to increase intestinal TJ permeability, the role of interleukin-1 alpha (IL-1α) in the TJ has not been studied. Phytochemicals could prevent proinflammatory cytokine-caused TJ alteration. Curcumin (CCM), a biologically active component of turmeric, has a strong anti-inflammatory activity. The purpose of this study was to elucidate the effect of IL-1α on intestinal epithelial TJ permeability and the role of CCM in IL-1α′s action on TJ in an in vitro intestinal epithelial system, Caco-2 monolayers. The TJ integrity of Caco-2 monolayers was estimated by measuring the flux of FITC-labeled dextran and transepithelial electrical resistance (TEER). Apical IL-1α (100 ng/ml) treatment elevated TJ permeability and suppressed TEER of Caco-2 monolayers. Pretreatment with CCM (20 μM) for 30 min significantly inhibited IL-1α-induced TJ alterations, such as increased TJ permeability and decreased in TEER values. These results demonstrated that IL-1α-induced increases in Caco-2 TJ permeability and CCM blocked the action of IL-1α in the TJ.
Keywords
Caco-2 cells; curcumin; interleukin-1α ; intestinal epithelial tight junction; permeability;
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