Insulin resistance is associated with altered amino acid metabolism and adipose tissue dysfunction in normoglycemic women

Insulin resistance is associated adiposity, but the mechanisms are not fully understood. In this study, we aimed to identify early metabolic alterations associated with insulin resistance in normoglycemic women with varying degree of adiposity. One-hundred and ten young and middle-aged women were di...

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Veröffentlicht in:Scientific reports 2016-04, Vol.6 (1), p.24540-24540, Article 24540
Hauptverfasser: Wiklund, Petri, Zhang, Xiaobo, Pekkala, Satu, Autio, Reija, Kong, Lingjia, Yang, Yifan, Keinänen-Kiukaanniemi, Sirkka, Alen, Markku, Cheng, Sulin
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creator Wiklund, Petri
Zhang, Xiaobo
Pekkala, Satu
Autio, Reija
Kong, Lingjia
Yang, Yifan
Keinänen-Kiukaanniemi, Sirkka
Alen, Markku
Cheng, Sulin
description Insulin resistance is associated adiposity, but the mechanisms are not fully understood. In this study, we aimed to identify early metabolic alterations associated with insulin resistance in normoglycemic women with varying degree of adiposity. One-hundred and ten young and middle-aged women were divided into low and high IR groups based on their median HOMA-IR (0.9 ± 0.4 vs. 2.8 ± 1.2). Body composition was assessed using DXA, skeletal muscle and liver fat by proton magnetic resonance spectroscopy, serum metabolites by nuclear magnetic resonance spectroscopy and adipose tissue and skeletal muscle gene expression by microarrays. High HOMA-IR subjects had higher serum branched-chain amino acid concentrations (BCAA) (p 
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In this study, we aimed to identify early metabolic alterations associated with insulin resistance in normoglycemic women with varying degree of adiposity. One-hundred and ten young and middle-aged women were divided into low and high IR groups based on their median HOMA-IR (0.9 ± 0.4 vs. 2.8 ± 1.2). Body composition was assessed using DXA, skeletal muscle and liver fat by proton magnetic resonance spectroscopy, serum metabolites by nuclear magnetic resonance spectroscopy and adipose tissue and skeletal muscle gene expression by microarrays. High HOMA-IR subjects had higher serum branched-chain amino acid concentrations (BCAA) (p &lt; 0.05 for both). Gene expression analysis of subcutaneous adipose tissue revealed significant down-regulation of genes related to BCAA catabolism and mitochondrial energy metabolism and up-regulation of several inflammation-related pathways in high HOMA-IR subjects (p &lt; 0.05 for all), but no differentially expressed genes in skeletal muscle were found. 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In this study, we aimed to identify early metabolic alterations associated with insulin resistance in normoglycemic women with varying degree of adiposity. One-hundred and ten young and middle-aged women were divided into low and high IR groups based on their median HOMA-IR (0.9 ± 0.4 vs. 2.8 ± 1.2). Body composition was assessed using DXA, skeletal muscle and liver fat by proton magnetic resonance spectroscopy, serum metabolites by nuclear magnetic resonance spectroscopy and adipose tissue and skeletal muscle gene expression by microarrays. High HOMA-IR subjects had higher serum branched-chain amino acid concentrations (BCAA) (p &lt; 0.05 for both). Gene expression analysis of subcutaneous adipose tissue revealed significant down-regulation of genes related to BCAA catabolism and mitochondrial energy metabolism and up-regulation of several inflammation-related pathways in high HOMA-IR subjects (p &lt; 0.05 for all), but no differentially expressed genes in skeletal muscle were found. In conclusion, in normoglycemic women insulin resistance was associated with increased serum BCAA concentrations, down-regulation of mitochondrial energy metabolism and increased expression of inflammation-related genes in the adipose tissue.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><pmid>27080554</pmid><doi>10.1038/srep24540</doi><tpages>1</tpages><oa>free_for_read</oa></addata></record>
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subjects 140/131
38/39
631/443/319
692/53/2423
Adipose tissue
Adipose Tissue - metabolism
Amino acids
Amino Acids - metabolism
Anthropometry
Blood Glucose
Body Composition
DNA microarrays
Dual energy X-ray absorptiometry
Energy metabolism
Female
Gene Expression
Gene regulation
Humanities and Social Sciences
Humans
Inflammation - genetics
Inflammation - metabolism
Insulin
Insulin Resistance
Liver
Magnetic resonance spectroscopy
Metabolism
Metabolites
Mitochondria
multidisciplinary
Muscle, Skeletal - metabolism
Musculoskeletal system
NMR
Nuclear magnetic resonance
Phosphorylation
Science
Science (multidisciplinary)
Signal Transduction
Skeletal muscle
Spectroscopy
Spectrum analysis
Subcutaneous Fat - metabolism
title Insulin resistance is associated with altered amino acid metabolism and adipose tissue dysfunction in normoglycemic women
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