Cited by 209Mitochondrial Function and PathologyAdipose Tissue and MetabolismAutophagy in Disease and Therapy

Role of mitochondrial dynamics proteins in the pathophysiology of obesity and type 2 diabetes

Zorzano, Antonio, Liesa, Marc, Palacín, Manuel·2009·The International Journal of Biochemistry & Cell Biology

Abstract

Mitochondrial dysfunction has been reported in skeletal muscle of obese subjects and of type 2 diabetic patients. Reduced mitochondrial mass and defective activity have been proposed to explain this dysfunction. Alterations in mitochondrial function may be crucial to explain the metabolic changes and insulin resistance that characterize both obesity and type 2 diabetes. Consequently, the identification of the primary mechanisms involved is of great relevance. Mitochondrial dynamics refers to the movement of mitochondria along the cytoskeleton and also to the regulation of mitochondrial morphology and distribution, which depend on fusion and fission events. In recent years, some of the proteins that participate in mitochondrial fusion and fission have been identified in mammalian cells. Recent evidence indicates that proteins participating in these processes are also involved in metabolism. The mitochondrial fusion protein mitofusin 2 stimulates respiration, substrate oxidation and the expression of subunits that participate in respiratory complexes in cultured cells. In this regard, skeletal muscle of obese subjects and of type 2 diabetic patients shows reduced mitofusin 2 expression. Therefore, alterations in the activity of the proteins involved in mitochondrial dynamics, and particularly mitofusin 2, may participate in the reduced mitochondrial function present in skeletal muscle in obesity and in type 2 diabetes.

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Crossref · 10.1016/j.biocel.2009.02.004

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  • Mice with skeletal muscle-specific deletion of Mfn2 exhibit impaired mitochondrial morphology, localization, and calcium uptake, ultimately resulting in decreased muscle cross-sectional area and strength.

    “Mice with skeletal muscle-specific deletion of Mfn2 exhibit impaired mitochondrial morphology, localization, and calcium uptake, ultimately resulting in decreased muscle cross-sectional area and strength.”
  • Skeletal muscle exhibits a high abundance of MFN2, and disruption of MFN2 is related to disruption in mitochondrial membrane potential and cellular oxygen consumption.

    “Skeletal muscle exhibits a high abundance of MFN2, and disruption of this protein have been related to disruption in mitochondrial membrane potential and cellular oxygen consumption [46].”
  • Reduced PGC1α expression in obese and diabetic muscle repressed MFN2 level.

    “reduced PGC1α expression in obese and diabetic muscle repressed MFN2 level [46], emphasizing the role of PGC1α as regulators of mitochondrial morphology and insulin sensitivity.”
  • Overexpression of PGC1α enhanced Mfn2 mRNA and protein levels in cultured muscle cells.

    “The transcriptional activity of Mfn2 gene was shown to be stimulated by PGC1α, as overexpression of PGC1α enhanced Mfn2 mRNA and protein levels in cultured muscle cells and”
  • Alterations in mitochondrial dynamics, particularly in Mfn2, are associated with reduced mitochondrial function in skeletal muscle in obesity and T2DM.

    “Further, alterations in mitochondrial dynamics and in particular in Mfn2, have been associated with a reduced mitochondrial function in skeletal muscle in obesity and T2DM (Zorzano et al., 2009) and recently aberrant mitochondrial fission has been also associated with insulin resistance in mouse skeletal muscle (Jheng et al., 2012).”

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Authors
Zorzano, A., Liesa, M., & Palacín, M.
Affiliations
Centro de Investigación Biomédica en Red Diabetes y Enfermedades Metabólicas Asociadas (ES)
Venue
The International Journal of Biochemistry & Cell Biology
Publisher
Elsevier BV
Published
2009-10
Volume
41
Issue
10
Pages
1846-1854
ISSN
1357-2725 (ISSN-L)
OpenAlex
W2056253513
Cited by
209
References
105
Citations by year
2026: 2 · 2025: 5 · 2024: 11 · 2023: 16 · 2022: 13 · 2021: 16 · 2020: 20 · 2019: 13 · 2018: 10 · 2017: 12 · 2016: 12 · 2015: 10 · 2014: 20 · 2013: 17 · 2012: 15
FWCI
0.79
Type
journal article
Language
en
Open access
closed
Locations
  • The International Journal of Biochemistry & Cell Biology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Generalitat de Catalunya
  • Instituto de Salud Carlos III
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
Keywords
mitochondrial dynamics, mitofusin 2, mitochondrial fusion, mitochondrial fission, mitochondrial dysfunction, skeletal muscle, obesity, type 2 diabetes, insulin resistance, mitochondrial respiration, substrate oxidation
MeSH terms
Animals, Diabetes Mellitus, Type 2, Humans, Insulin Resistance, Mitochondria, Obesity, Mitochondrial Proteins

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