Effect of insulin deprivation on muscle mitochondrial ATP production and gene transcript levels in type 1 diabetic subjects

被引:99
作者
Karakelides, Helen
Asmann, Yan W.
Bigelow, Maureen L.
Short, Kevin R.
Dhatariya, Ketan
Coenen-Schimke, Jill
Kahl, Jane
Mukhopadhyay, Debabrata
Nair, K. Sreekumaran
机构
[1] Mayo Clin, Div Endocrinol & Metab, Rochester, MN 55905 USA
[2] Mayo Clin, Endocrine Res Unit, Rochester, MN USA
[3] Mayo Clin, Dept Biochem & Mol Biol, Rochester, MN USA
关键词
D O I
10.2337/db07-0378
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
OBJECTIVE-Muscle mitochondrial dysfunction occurs in many insulin-resistant states, such as type 2 diabetes, prompting a hypothesis that mitochondrial dysfunction may cause insulin resistance. We determined the impact of insulin deficiency on muscle mitochondrial ATP production by temporarily depriving type I diabetic patients of insulin treatment. RESEARCH DESIGN AND METHODS-We withdrew insulin for 8.6 +/- 0.6 h in nine C-peptide-negative type 1 diabetic subjects and measured muscle mitochondrial ATP production and gene transcript levels (gene array and real-time quantitative PCR) and compared with insulin-treated state. We also measured oxygen consumption (indirect calorimetry); plasma levels of glucagon, bicarbonate, and other substrates; and urinary nitrogen. RESULTS-Withdrawal of insulin resulted in increased plasma glucose, branched chain amino acids, nonesterified fatty acids, P-hydroxybutyrate, and urinary nitrogen but no change in bicarbonate. Insulin deprivation decreased muscle mitochondrial ATP production rate (MAPR) despite an increase in whole-body oxygen consumption and altered expression of many muscle mitochondiial gene transcripts. Transcript levels of genes involved in oxidative phosphorylation were decreased, whereas those involved in vascular endothelial growth factor (VEGF) signaling, inflammation, cytoskeleton signaling, and integrin signaling pathways were increased. CONCLUSIONS-Insulin deficiency and associated metabolic changes reduce muscle MAPR and expression of oxidative phosphorylation genes in type 1 diabetes despite an increase in whole-body oxygen consumption. Increase in transcript levels of genes involved in VEGF, inflammation, cytoskeleton, and integrin signaling pathways suggest that vascular factors and cell proliferation that may interact with mitochondrial changes occurred.
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收藏
页码:2683 / 2689
页数:7
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