Program in Molecular Medicine, Department of Medicine; Division of Endocrinology, Metabolism and Diabetes, Department of Medicine
Amino Acids, Peptides, and Proteins | Biochemical Phenomena, Metabolism, and Nutrition | Cellular and Molecular Physiology | Endocrinology, Diabetes, and Metabolism | Molecular Biology | Molecular, Genetic, and Biochemical Nutrition | Nutritional and Metabolic Diseases
Increased consumption of fats and added sugars has been associated with an increase in metabolic syndromes. Here we show that mice chronically fed an energy-rich diet (ERD) with high fat and moderate sucrose have enhanced the absorption of a gastrointestinal fructose load, and this required expression of the arrestin domain protein Txnip in the intestinal epithelial cells. ERD feeding induced gene and protein expression of Glut5, and this required the expression of Txnip. Furthermore, Txnip interacted with Rab11a, a small GTPase that facilitates the apical localization of Glut5. We also demonstrate that ERD promoted Txnip/Glut5 complexes in the apical intestinal epithelial cell. Our findings demonstrate that ERD facilitates fructose absorption through a Txnip-dependent mechanism in the intestinal epithelial cell, suggesting that increased fructose absorption could potentially provide a mechanism for worsening of metabolic syndromes in the setting of a chronic ERD.
Human Metabolism, Molecular Biology
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Copyright 2020 The Author(s). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
DOI of Published Version
Shah A, Dagdeviren S, Lewandowski JP, Schmider AB, Ricci-Blair EM, Natarajan N, Hundal H, Noh HL, Friedline RH, Vidoudez C, Kim JK, Wagers AJ, Soberman RJ, Lee RT. Thioredoxin Interacting Protein Is Required for a Chronic Energy-Rich Diet to Promote Intestinal Fructose Absorption. iScience. 2020 Sep 2;23(9):101521. doi: 10.1016/j.isci.2020.101521. Epub ahead of print. PMID: 32927265; PMCID: PMC7495107. Link to article on publisher's site
Shah A, Dagdeviren S, Lewandowski JP, Schmider AB, Ricci-Blair EM, Natarajan N, Hundal H, Noh HL, Friedline RH, Vidoudez C, Kim JK, Wagers AJ, Soberman RJ, Lee RT. (2020). Thioredoxin Interacting Protein Is Required for a Chronic Energy-Rich Diet to Promote Intestinal Fructose Absorption. Open Access Publications by UMMS Authors. https://doi.org/10.1016/j.isci.2020.101521. Retrieved from https://escholarship.umassmed.edu/oapubs/4362
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Amino Acids, Peptides, and Proteins Commons, Biochemical Phenomena, Metabolism, and Nutrition Commons, Cellular and Molecular Physiology Commons, Endocrinology, Diabetes, and Metabolism Commons, Molecular Biology Commons, Molecular, Genetic, and Biochemical Nutrition Commons, Nutritional and Metabolic Diseases Commons