Cited by 29Metabolism, Diabetes, and CancerAdipose Tissue and MetabolismMitochondrial Function and Pathology

Overexpression of mitofusin 2 improves translocation of glucose transporter 4 in skeletal muscle of high‑fat diet‑fed rats through AMP‑activated protein kinase signaling.

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KONG, DEXIAN, SONG, GUANGYAO, WANG, CHAO, MA, HUIJUAN, REN, LUPING, NIE, QIAN, ZHANG, XUEMEI, GAN, KEXIN·2013·Molecular Medicine Reports

Abstract

Mitofusin 2 (Mfn2) is a mitochondrial membrane protein that plays a role in mitochondrial fusion and metabolism in mammalian cells. Previous studies have reported a positive correlation between Mfn2 expression and insulin sensitivity in non‑diabetic and type 2 diabetic subjects. Thus, the aim of the present study was to investigate whether Mfn2 overexpression improves insulin sensitivity of high‑fat diet (HFD) rats and the possible underlying mechanisms. Male SD rats were randomly divided into four groups: negative control; HFD; HFD plus adenoviral vectors; and HFD plus adenoviral vectors encoding Mfn2. Following an 11‑week treatment protocol, the euglycemic‑hyperinsulinemic clamp technique was applied to evaluate insulin sensitivity in rats. The skeletal muscles from rats in each group were analyzed by real‑time PCR and western blot analysis to determine glucose transporter 4 (GLUT4) expression, translocation and relative translocation signaling. Consistent with Mfn2 repression and glucose intolerance, HFD downregulates GLUT4 expression at the mRNA and protein levels, while Mfn2 overexpression activates AMP‑activated protein kinase (AMPK), increases GLUT4 expression and translocation and improves insulin resistance in the skeletal muscles of HFD rats. Results of the present study indicate that Mfn2 overexpression improves insulin sensitivity and may regulate GLUT4 translocation in an AMPK‑dependent manner in the skeletal muscles of HFD rats. This study is likely to provide insight into the unique role of Mfn2 in promoting glucose uptake, leading to modulation of GLUT4 translocation signaling and maintenance of glucose homeostasis in vivo.

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Authors
KONG, D., SONG, G., WANG, C., MA, H., REN, L., NIE, Q., ZHANG, X., & GAN, K.
Affiliations
  • Hebei Medical University (CN)
  • Hebei General Hospital (CN)
Venue
Molecular Medicine Reports
Published
2013-05-02
Volume
8
Issue
1
Pages
205-210
ISSN
  • 1791-2997 (ISSN-L)
  • 1791-3004
OpenAlex
W2017023704
Cited by
29
References
25
Citations by year
2024: 3 · 2022: 2 · 2021: 5 · 2020: 1 · 2019: 5 · 2018: 1 · 2017: 3 · 2016: 1 · 2015: 4 · 2014: 4
FWCI
1.34
Type
journal article
Language
en
Open access
Locations
  • Molecular Medicine Reports (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
Keywords
mitofusin 2, glucose transporter 4, GLUT4 translocation, AMPK, insulin sensitivity, insulin resistance, high-fat diet, skeletal muscle, glucose uptake, glucose homeostasis, mitochondrial fusion, adenoviral overexpression
MeSH terms
Animals, Blood Glucose, Fatty Acids, Gene Expression Regulation, Glucose, Insulin, Male, Membrane Proteins, Signal Transduction, Gene Expression, Muscle, Skeletal, GTP Phosphohydrolases, Protein Transport, Mitochondrial Proteins, Proto-Oncogene Proteins c-akt, Glucose Transporter Type 4, Rats, AMP-Activated Protein Kinases, Diet, High-Fat

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