Time-Dependent alteration to the tight junction structure of distal intestinal epithelia in type 2 prediabetic mice

Publication date: Available online 18 October 2019Source: Life SciencesAuthor(s): Ricardo Beltrame de Oliveira, Valquiria Aparecida Matheus, Leandro Pereira Canuto, Ariane De Sant'ana, Carla Beatriz Collares-BuzatoAbstractAimHigh-fat diet (HFD) intake has been associated with changes in intestinal microbiota composition, increased intestinal permeability, and onset of type 2 diabetes mellitus (T2DM). The aim of this work was twofold: 1) to investigate the structural and functional alterations of the tight junction (TJ)-mediated intestinal epithelial barrier of ileum and colon, that concentrate most of the microbiota, after exposure to a HFD for 15, 30 and 60 days, and 2) to assess the effect of in vitro exposure to free fatty acids (FFAs), one of the components of HFD, on paracellular barrier of colon-derived Caco-2 cells.Methods/key findingsHFD exposure induced progressive metabolic changes in male mice that culminated in prediabetes after 60d. Morphological analysis of ileum and colon mucosa showed no signs of epithelial rupture or local inflammation but changes in the junctional content/distribution and/or cellular content of TJ-associated proteins (claudins-1, -2, -3, and occludin) in intestinal epithelia were seen mainly after a prediabetes state has been established. This impairment in TJ structure was not associated with significant changes in intestinal permeability to FITC-dextran. Exposure of Caco-2 monolayers to palmitic or linoleic acids seems to induce a reinfo...
Source: Life Sciences - Category: Biology Source Type: research

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Source: Diabetes and Metabolism Journal - Category: Endocrinology Tags: Diabetes Metab J Source Type: research
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Source: Life Sciences - Category: Biology Source Type: research
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