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Title: A prebiotic fructo-oligosaccharide promotes tight junction assembly in intestinal epithelial cells via an AMPK-dependent pathway
Authors: Preedajit Wongkrasant
Pawin Pongkorpsakol
Jutharat Ariyadamrongkwan
Roojanaat Meesomboon
Saravut Satitsri
Rath Pichyangkura
Kim E. Barrett
Chatchai Muanprasat
University of California, San Diego
Chulalongkorn University
Faculty of Medicine, Ramathibodi Hospital, Mahidol University
Mahidol University
Keywords: Pharmacology, Toxicology and Pharmaceutics
Issue Date: 1-Sep-2020
Citation: Biomedicine and Pharmacotherapy. Vol.129, (2020)
Abstract: © 2020 The Authors Tight junctions play an important role in maintaining barrier integrity of intestinal epithelia. Activation of AMP-activated protein kinase (AMPK) promotes tight junction assembly in intestinal epithelial cells (IEC). Fructo-oligosaccharides (FOS), well-known prebiotics, have previously been shown to alleviate inflammation-associated intestinal epithelial disruption although the mechanisms were unclear. This study aimed to investigate any effect of FOS on AMPK activity and tight junction assembly under non-inflammatory and inflammatory conditions using T84 cells as an IEC model. As analyzed by western blot, FOS induced AMPK activation through a calcium sensing receptor (CaSR)-phospholipase C (PLC)- Ca2+/calmodulin-dependent protein kinase kinase-β (CaMKKβ) pathway. Calcium switch assays and immunofluorescence staining of zonula occludens-1 (ZO-1) revealed that FOS induced tight junction assembly via an CaMKKβ-AMPK-dependent mechanism in IEC. Interestingly, FOS reversed the suppressive effect of lipopolysaccharide (LPS) on AMPK activity and tight junction assembly via a CaMKKβ pathway. Taken together, these findings uncover a prebiotic-independent effect of FOS in promoting intestinal epithelial tight junction assembly through AMPK activation, which may have implications for the treatment of diseases whose pathogenesis involves impaired intestinal barrier function.
ISSN: 19506007
Appears in Collections:Scopus 2020

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