• Guilherme R Romualdo, Letícia Cardoso Valente, Ana Carolina Sprocatti, Gabriel Prata Bacil, Isadora Penedo de Souza, Josias Rodrigues, RodriguesMaria Aparecida MarchesanMAMSão Paulo State University (UNESP), Botucatu Medical School, Department of Pathology, Botucatu, Brazil., Mathieu Vinken, Bruno Cogliati, and Luís Fernando Barbisan.
• São Paulo State University (UNESP), Botucatu Medical School, Department of Pathology, Botucatu, Brazil; São Paulo State University (UNESP), Biosciences Institute, Department of Structural and Functional Biology, Botucatu, Brazil. Electronic address: guilherme.romualdo@unesp.br.
• Nutrition. 2022 Nov 1; 103-104: 111836.

ObjectivesNon-alcoholic fatty liver disease (NAFLD) has a growing epidemiologic and economic burden. It is associated with Western diet (WD) patterns, and its pathogenesis involves metabolic disorders (obesity, dyslipidemia, hyperglycemia, and diabetes) and gut dysbiosis, features that are usually neglected or not reproduced by most animal models. Thus, we established a 6-mo WD-induced NAFLD mouse model associated with metabolic disorder, investigating its main features at the gut microbiome-liver-adipose tissue axis, also evaluating the correlations of gut dysbiosis to the other disease outcomes.MethodsMale C57 BL6 mice received a high-fat (30% lard and 0.2% cholesterol, ∼57% calories) and sucrose-rich (20%) chow, and a high-sugar solution (23.1 and 18.9 g/L of D-fructose and D-glucose) for 6 mo.ResultsThe model featured high serum cholesterol levels, glucose intolerance, and hyperinsulinemia. WD intervention resulted in extensive macro/microvesicular liver steatosis and pericellular fibrosis-resembling human disease-accompanied by hepatic stellate cell activation and CD68+ macrophage infiltration, increased protein levels of proinflammatory p65-nuclear factor-κB, interleukin-6 and tumor necrosis factor-α, with decreased antioxidant regulator Nrf2. Mice showed clear obesity with adipocyte hypertrophy, and CD68+macrophage/mast cell infiltration in adipose tissue while a reduction in number of goblet cells was also observed in the small intestine. Moreover, the pyrosequencing of the 16 S ribosomal RNA of gut cecal content showed decreased bacterial diversity, enriched Firmicutes and Proteobacteria, decreased Bacteroidetes and Fusobacteria, and increased ratio of Firmicutes to Bacteroidetes. Bacteroidetes and Bacteroides had the highest number of significant correlations with liver-adipose tissue axis outcomes. In silico analysis of gut microbiome in NAFLD obese patients revealed a depletion in Bacteroides, which also correlated to disease outcomes.ConclusionThis mice model gathered suitable phenotypical alterations in gut-liver-adipose tissue axis that resembled NAFLD associated with metabolic disorders in humans and may be considered for preclinical investigation.Copyright © 2022 Elsevier Inc. All rights reserved.

29 keywords...

hide…