Intestinal acyl-CoA:diacylglycerol acyltransferase 2 overexpression enhances postprandial triglyceridemic response and exacerbates high fat diet-induced hepatic triacylglycerol storage |
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Authors: | Aki Uchida Mikhail N Slipchenko Trisha Eustaquio James F Leary Ji-Xin Cheng Kimberly K Buhman |
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Institution: | 1. Interdisciplinary Life Science Program, Purdue University, West Lafayette, IN, USA;2. Department of Nutrition Science, Purdue University, West Lafayette, IN, USA;3. Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN, USA;4. Birck Nanotechnology Center Purdue University, West Lafayette, IN, USA;5. Department of Basic Medical Sciences, Purdue University, West Lafayette, IN, USA;6. Department of Chemistry, Purdue University, West Lafayette, IN, USA |
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Abstract: | Intestinal acyl-CoA:diacylglycerol acyltransferase 2 (DGAT2) is important in the cellular and physiological responses to dietary fat. To determine the effect of increased intestinal DGAT2 on cellular and physiological responses to acute and chronic dietary fat challenges, we generated mice with intestine-specific overexpression of DGAT2 and compared them with intestine-specific overexpression of DGAT1 and wild-type (WT) mice. We found that when intestinal DGAT2 is present in excess, triacylglycerol (TG) secretion from enterocytes is enhanced compared to WT mice; however, TG storage within enterocytes is similar compared to WT mice. We found that when intestinal DGAT2 is present in excess, mRNA levels of genes involved in fatty acid oxidation were reduced. This result suggests that reduced fatty acid oxidation may contribute to increased TG secretion by overexpression of DGAT2 in intestine. Furthermore, this enhanced supply of TG for secretion in Dgat2Int mice may be a significant contributing factor to the elevated fasting plasma TG and exacerbated hepatic TG storage in response to a chronic HFD. These results highlight that altering fatty acid and TG metabolism within enterocytes has the capacity to alter systemic delivery of dietary fat and may serve as an effective target for preventing and treating metabolic diseases such as hepatic steatosis. |
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Keywords: | CM chylomicrons CARS coherent anti-Stokes Raman scattering CLD cytoplasmic lipid droplets DLS dynamic light scattering DGAT diacylglycerol acyltransferase HFD high-fat diet TG triacylglycerol WT wild-type |
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