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DOI: 10.1055/s-2003-42657
Does High-sucrose Diet alter Skeletal Muscle and Liver Mitochondrial Respiration?
Publication History
Received 4 October 2002
Accepted after Revision 25 April 2003
Publication Date:
30 September 2003 (online)
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Abstract
A diet high in sucrose or fructose progressively impairs glucose and lipid metabolism, which leads to insulin resistance. As mitochondria are the sites of the oxidation and utilization of these substrates, we hypothesized that a high sucrose diet would alter mitochondrial respiration. Male Wistar rats were fed high-sucrose (SU) or control (CTL) diet for one week; mitochondrial respiration was investigated in mitochondria isolated from liver and both glycolytic and oxidative muscles, with pyruvate and palmitate as substrates. To test for metabolic disturbances, we measured not only glycogen content in muscles and liver, but also lactate, glucose and triglyceride blood concentrations. After one week of high-sucrose intake, we found no change in blood concentration of these variables, but glycogen content was significantly increased in liver (17.28 ± 2.98 mg/g tissue SU vs 6.47 ± 1.67 mg/g tissue CTL), oxidative muscle (1.59 ± 0.21 mg/g tissue SU vs 0.70 ± 0.24 mg/g tissue CTL) though not in glycolytic muscle (1.72 ± 0.44 mg/g tissue SU vs 1.52 ± 0.20 mg/g tissue CTL). State 3 mitochondrial respiration was significantly decreased in SU rats compared with CTL (p < 0.05) with pyruvate, while no change was observed with palmitate. This study shows that 1-week of high-sucrose diet altered mitochondrial pyruvate oxidation in rats and suggests that, in the context of a high-sucrose diet, impaired mitochondrial respiration could contributed to the development of insulin resistance.
Key words
Metabolism - Diet - Insulin Resistance
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K. Lambert
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