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- W4221043485 abstract "The mitochondrial enzyme SIRT3 is an NAD+-dependent deacetylase important in cell metabolism, and a decline in its protein expression or activity has been linked with insulin resistance in obesity, ageing and type 2 diabetes. While studies in SIRT3 knockout mice have dramatically improved our understanding of the function of SIRT3, the impact of increasing SIRT3 levels remains under-examined. In this study we investigated the effects of liver-specific SIRT3 overexpression in mice on mitochondrial function and metabolic profile in both isolated hepatocytes and in vivo. Primary hepatocytes overexpressing SIRT3 displayed increased oxygen consumption and a reduction in triglyceride accumulation. In mice with hepatic SIRT3 overexpression, increased fasting β-hydroxybutyrate levels were observed, coupled with an increase in oxygen consumption in isolated mitochondria and increased substrate utilization in liver homogenates. However, metabolic profiling of mice exposed to either chow or high-fat diet revealed no effect of hepatic SIRT3 overexpression on glucose tolerance, body composition or tissue triglyceride accumulation. These findings suggest limited whole-body benefit of increasing hepatic SIRT3 during the development of diet-induced insulin resistance." @default.
- W4221043485 created "2022-04-03" @default.
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- W4221043485 date "2022-06-01" @default.
- W4221043485 modified "2023-09-25" @default.
- W4221043485 title "Liver-specific overexpression of SIRT3 enhances oxidative metabolism, but does not impact metabolic defects induced by high fat feeding in mice" @default.
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- W4221043485 doi "https://doi.org/10.1016/j.bbrc.2022.03.088" @default.
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