Cited by 38Adipose Tissue and MetabolismMetabolism, Diabetes, and CancerMuscle Physiology and Disorders

Paradoxical changes in muscle gene expression in insulin-resistant subjects after sustained reduction in plasma free fatty acid concentration.

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Bajaj, Mandeep, Medina-Navarro, Rafael, Suraamornkul, Swangjit, Meyer, Christian, DeFronzo, Ralph A., Mandarino, Lawrence J.·2007·Diabetes

Abstract

Lipid oversupply plays a role in developing insulin resistance in skeletal muscle, decreasing expression of nuclear-encoded mitochondrial genes, and increasing extracellular matrix remodeling. To determine if a decrease in plasma lipid content reverses these abnormalities, insulin-resistant subjects with a family history of type 2 diabetes had euglycemic clamps and muscle biopsies before and after acipimox treatment to suppress free fatty acids. Free fatty acids fell from 0.584 +/- 0.041 to 0.252 +/- 0.053 mmol/l (P < 0.001) and glucose disposal increased from 5.28 +/- 0.46 to 6.31 +/- 0.55 mg . kg(-1) . min(-1) (P < 0.05) after acipimox; intramuscular fatty acyl CoA decreased from 10.3 +/- 1.9 to 4.54 +/- 0.82 pmol/mg muscle (P < 0.01). Paradoxically, expression of PGC-1-and nuclear-encoded mitochondrial genes decreased after acipimox, and expression of collagens I and III alpha-subunits (82- and 21-fold increase, respectively, P < 0.05), connective tissue growth factor (2.5-fold increase, P < 0.001), and transforming growth factor-beta1 increased (2.95-fold increase, P < 0.05). Therefore, a reduction in lipid supply does not completely reverse the molecular changes associated with lipid oversupply in muscle. Changes in expression of nuclear-encoded mitochondrial genes do not always correlate with changes in insulin sensitivity.

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  • Relatively short-term reductions in serum fatty acids and intracellular fatty acyl CoA levels mediated by acipimox treatment in healthy humans are associated with reduced expression of nuclear-encoded mitochondrial oxidative genes in parallel with enhanced insulin sensitivity.

    “Similarly, relatively short-term reductions in serum fatty acids and intracellular fatty acyl CoA levels mediated by acipimox treatment in healthy humans are associated with reduced expression of nuclear-encoded mitochondrial oxidative genes-in parallel with enhanced insulin sensitivity (294).”

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Authors
Bajaj, M., Medina-Navarro, R., Suraamornkul, S., Meyer, C., DeFronzo, R. A., & Mandarino, L. J.
Affiliations
  • The University of Texas at San Antonio Health Science Center (US)
  • Arizona State University (US)
Venue
Diabetes
Published
2007-03-01
Volume
56
Issue
3
Pages
743-752
ISSN
  • 0012-1797 (ISSN-L)
  • 1939-327X
OpenAlex
W2169964856
Cited by
38
References
66
Citations by year
2023: 1 · 2021: 2 · 2020: 2 · 2017: 3 · 2015: 3 · 2014: 2 · 2013: 4 · 2012: 5
FWCI
3.10
Type
journal article
Language
en
Open access
Locations
  • Diabetes (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute of Diabetes and Digestive and Kidney Diseases (R01DK066483)
Topics
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
Keywords
insulin resistance, skeletal muscle, free fatty acids, acipimox, mitochondrial gene expression, PGC-1, extracellular matrix remodeling, collagen, connective tissue growth factor, TGF-β1, glucose disposal, type 2 diabetes, fatty acyl-CoA
MeSH terms
Adult, Hypolipidemic Agents, Fatty Acids, Nonesterified, Female, Gene Expression Regulation, Humans, Insulin, Insulin Resistance, Male, Middle Aged, Muscle Proteins, Pyrazines, RNA, Messenger, Free Radical Scavengers, Muscle, Skeletal, Gene Expression Profiling

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