Cited by 190Adipose Tissue and MetabolismMetabolism, Diabetes, and CancerMitochondrial Function and Pathology

Subjects With Early-Onset Type 2 Diabetes Show Defective Activation of the Skeletal Muscle PGC-1α/Mitofusin-2 Regulatory Pathway in Response to Physical Activity

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Hernández-Alvarez, María Isabel, Thabit, Hood, Burns, Nicole, Shah, Syed, Brema, Imad, Hatunic, Mensud, Finucane, Francis, Liesa, Marc +4 more·2010·Diabetes Care

Abstract

OBJECTIVE: Type 2 diabetes is associated with insulin resistance and skeletal muscle mitochondrial dysfunction. We have found that subjects with early-onset type 2 diabetes show incapacity to increase Vo2max in response to chronic exercise. This suggests a defect in muscle mitochondrial response to exercise. Here, we have explored the nature of the mechanisms involved. RESEARCH DESIGN AND METHODS: Muscle biopsies were collected from young type 2 diabetic subjects and obese control subjects before and after acute or chronic exercise protocols, and the expression of genes and/or proteins relevant to mitochondrial function was measured. In particular, the regulatory pathway peroxisome proliferator–activated receptor γ coactivator (PGC)-1α/mitofusin-2 (Mfn2) was analyzed. RESULTS: At baseline, subjects with diabetes showed reduced expression (by 26%) of the mitochondrial fusion protein Mfn2 and a 39% reduction of the α-subunit of ATP synthase. Porin expression was unchanged, consistent with normal mitochondrial mass. Chronic exercise led to a 2.8-fold increase in Mfn2, as well as increases in porin, and the α-subunit of ATP synthase in muscle from control subjects. However, Mfn2 was unchanged after chronic exercise in individuals with diabetes, whereas porin and α-subunit of ATP synthase were increased. Acute exercise caused a fourfold increase in PGC-1α expression in muscle from control subjects but not in subjects with diabetes. CONCLUSIONS: Our results demonstrate alterations in the regulatory pathway that controls PGC-1α expression and induction of Mfn2 in muscle from patients with early-onset type 2 diabetes. Patients with early-onset type 2 diabetes display abnormalities in the exercise-dependent pathway that regulates the expression of PGC-1α and Mfn2.

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  • Reduction of the mitochondrial fusion machinery in muscle has been linked to age-related sarcopenia and metabolic diseases like obesity and type 2 diabetes in both rodents and humans.

    “Accordingly, the reduction of the mitochondrial fusion machinery in muscle has been linked to age-related sarcopenia [185–187], and metabolic diseases like obesity and type 2 diabetes [188, 189] in both rodents and humans.”

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Authors
Hernández-Alvarez, M. I., Thabit, H., Burns, N., Shah, S., Brema, I., Hatunic, M., Finucane, F., Liesa, M., Chiellini, C., Naon, D., Zorzano, A., & Nolan, J. J.
Affiliations
  • Institute for Research in Biomedicine (IRB Barcelona), Barcelona, Spain;
  • Trinity College Dublin (IE)
  • Centro de Investigación Biomédica en Red Diabetes y Enfermedades Metabólicas Asociadas (ES)
  • Università Cattolica del Sacro Cuore (IT)
Corresponding author
Nolan, John J.
Venue
Diabetes Care
Published
2009-12-23
Volume
33
Issue
3
Pages
645-651
ISSN
  • 0149-5992 (ISSN-L)
  • 1935-5548
OpenAlex
W2122442017
Cited by
189
References
25
Citations by year
2026: 4 · 2025: 6 · 2024: 13 · 2023: 10 · 2022: 9 · 2021: 9 · 2020: 11 · 2019: 13 · 2018: 14 · 2017: 6 · 2016: 16 · 2015: 19 · 2014: 15 · 2013: 21 · 2012: 8
FWCI
4.86
Type
journal article
Language
en
Open access
Locations
  • Diabetes Care (publishedVersion, cc-by-nc-nd)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • Research Explorer (The University of Manchester) (submittedVersion, cc-by-nc-nd)
Funders
  • European Foundation for the Study of Diabetes
  • Novo Nordisk
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 › Mitochondrial Function and Pathology
Keywords
early-onset type 2 diabetes, PGC-1α, mitofusin 2, skeletal muscle mitochondrial function, mitochondrial fusion, exercise response, exercise training, acute exercise, porin, mitochondrial biogenesis, insulin resistance
MeSH terms
Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha, Adult, Biopsy, Diabetes Mellitus, Type 2, Female, Gene Expression Regulation, Heat-Shock Proteins, Humans, Male, Membrane Proteins, Motor Activity, Time Factors, Transcription Factors, Signal Transduction, Age of Onset, Muscle, Skeletal, GTP Phosphohydrolases, Mitochondrial Proteins, Young Adult

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