Cited by 221Cell death mechanisms and regulationMuscle Physiology and DisordersMitochondrial Function and Pathology

Mitochondria-associated apoptotic signalling in denervated rat skeletal muscle

Siu, Parco M., Alway, Stephen E.·2005·The Journal of Physiology

Abstract

Apoptosis has been implicated in the regulation of denervation-induced muscle atrophy. However, the activation of apoptotic signal transduction during muscle denervation has not been fully elucidated. The present study examined the apoptotic responses to denervation in rat gastrocnemius muscle. Following 14 days of denervation, the extent of apoptotic DNA fragmentation as determined by a cytosolic nucleosome ELISA was increased by 100% in the gastrocnemius muscle. RT-PCR and immunoblot analyses indicated that Bax was dramatically upregulated while Bcl-2 was modestly increased; however, the Bax/Bcl-2 ratio was significantly increased in denervated muscles relative to control muscles. Analyses of ELISA and immunoblots from mitochondria-free cytosol extracts showed a significant increase in mitochondria-associated apoptotic factors, including cytochrome c, Smac/DIABLO and apoptosis-inducing factor (AIF). In addition to the upregulation of caspase-3 and -9 mRNA, pro-/cleaved caspase protein and proteolytic activity levels, the X-linked inhibitor of apoptosis (XIAP) protein level was downregulated. The cleaved product of poly(ADP-ribose) polymerase (PARP) was detected in muscle samples following denervation. Although we did not find a difference in the inhibitor of DNA binding/differentiation-2 (Id2) and c-Myc protein contents between the denervated and control muscles, the protein content of tumour suppressor p53 was significantly increased in both the nuclear and the cytosolic fractions with denervation. Moreover, denervation increased the protein content of HSP70, whereas the MnSOD (a mitochondrial isoform of superoxide dismutase) protein content was diminished, which indicated that denervation might have induced cellular and/or oxidative stress. Our data show that mitochondria-associated apoptotic signalling is upregulated during muscle denervation. We interpret these findings to indicate that apoptosis has a physiologically important role in regulating denervation-induced muscle atrophy.

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Crossref · 10.1113/jphysiol.2004.081083

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  • In aging, loss of innervation induces profound muscle atrophy.

    “In aging, a loss of innervation induces profound muscle atrophy (5, 106, 129).”

    From Mitochondria initiate and regulate sarcopenia (2017) · cites this paper as [129]

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Authors
Siu, P. M., & Alway, S. E.
Affiliations
West Virginia University (US)
Venue
The Journal of Physiology
Publisher
Wiley
Published
2005-05
Volume
565
Issue
1
Pages
309-323
ISSN
  • 0022-3751 (ISSN-L)
  • 1469-7793
OpenAlex
W1484492220
Cited by
216
References
85
Citations by year
2026: 1 · 2025: 5 · 2024: 4 · 2023: 6 · 2022: 8 · 2021: 14 · 2020: 8 · 2019: 3 · 2018: 6 · 2017: 8 · 2016: 7 · 2015: 15 · 2014: 8 · 2013: 8 · 2012: 10
FWCI
7.15
Type
journal article
Language
en
Open access
closed
Locations
  • The Journal of Physiology (publishedVersion)
  • PubMed (publishedVersion)
  • The HKU Scholars Hub (University of Hong Kong) (submittedVersion)
Funders
National Institute on Aging (R01AG021530)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
Keywords
muscle denervation, muscle atrophy, apoptosis, gastrocnemius, Bax/Bcl-2 ratio, cytochrome c, Smac/DIABLO, apoptosis-inducing factor, caspase-3, caspase-9, XIAP, PARP cleavage, p53, HSP70, manganese superoxide dismutase, oxidative stress, skeletal muscle
MeSH terms
Animals, Gene Expression Regulation, Mitochondria, Muscle, Muscle Denervation, Muscle Proteins, Rats, Inbred F344, Signal Transduction, Apoptosis, Muscle, Skeletal, Rats

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