Cited by 352Lysosomal Storage Disorders ResearchAutophagy in Disease and TherapyGlycogen Storage Diseases and Myoclonus

Suppression of autophagy in skeletal muscle uncovers the accumulation of ubiquitinated proteins and their potential role in muscle damage in Pompe disease.

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Raben, N., Hill, V., Shea, L., Takikita, S., Baum, R., Mizushima, N., Ralston, E., Plotz, P.·2008·Human Molecular Genetics

Abstract

The role of autophagy, a catabolic lysosome-dependent pathway, has recently been recognized in a variety of disorders, including Pompe disease, the genetic deficiency of the glycogen-degrading lysosomal enzyme acid-alpha glucosidase. Accumulation of lysosomal glycogen, presumably transported from the cytoplasm by the autophagic pathway, occurs in multiple tissues, but pathology is most severe in skeletal and cardiac muscle. Skeletal muscle pathology also involves massive autophagic buildup in the core of myofibers. To determine if glycogen reaches the lysosome via autophagy and to ascertain whether autophagic buildup in Pompe disease is a consequence of induction of autophagy and/or reduced turnover due to defective fusion with lysosomes, we generated muscle-specific autophagy-deficient Pompe mice. We have demonstrated that autophagy is not required for glycogen transport to lysosomes in skeletal muscle. We have also found that Pompe disease involves induction of autophagy but manifests as a functional deficiency of autophagy because of impaired autophagosomal-lysosomal fusion. As a result, autophagic substrates, including potentially toxic aggregate-prone ubiquitinated proteins, accumulate in Pompe myofibers and may cause profound muscle damage.

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  • Impaired autophagy induces skeletal myofiber degeneration and muscle weakness.

    “Impaired autophagy is known to induce skeletal myofiber degeneration and muscle weakness (Masiero et al., 2009; Raben et al., 2008).”

    From Proteasome dysfunction induces muscle growth defects and protein aggregation (2014) · cites this paper as Raben et al., 2008

    In the Results section on suppression of autophagy, autophagy-deficient Pompe mice had greater myofiber atrophy and performed worse on a wire-hang test than Pompe mice without autophagy suppression. But autophagy-deficient healthy mice showed fast-fiber atrophy without reduced wire-hang performance. The claim omits this disease-context qualification and overgeneralizes the muscle-weakness finding. (LLM, conf=0.88)

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  • Impairment of autophagy by muscle-specific ablation of ATG5 and ATG7 induces accumulation of abnormal mitochondria, induction of oxidative stress, apoptosis, muscle atrophy, weakness, and several features of myopathy.

    “Likewise, impairment of autophagy by muscle-specific ablation of ATG5 and ATG7 induces accumulation of abnormal mitochondria, induction of oxidative stress, apoptosis, muscle atrophy, weakness, several features of myopathy [230, 231].”
  • Conditional Atg5 deletion in mouse skeletal muscle leads to accumulation of ubiquitin-positive inclusions and ultrastructural disorganization.

    “Analogously, conditional Atg5 deletion in mouse skeletal muscle leads to accumulation of ubiquitin-positive inclusions and ultrastructural disorganization [478].”

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Research works printed but not linked: 1

  1. Gomes, M.D., Lecker, S.H., Jagoe, R.T., Navon, A. and Goldberg A.L. (2001) Atrogin-1, a muscle-specific F-box protein highly expressed during muscle atrophy. Proc. Natl Acad. Sci. USA, 98, 14440-14445.

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Authors
Raben, N., Hill, V., Shea, L., Takikita, S., Baum, R., Mizushima, N., Ralston, E., & Plotz, P.
Affiliations
  • National Institutes of Health (US)
  • Tokyo Medical and Dental University (JP)
Corresponding author
Raben, N.
Venue
Human Molecular Genetics
Published
2008-09-04
Volume
17
Issue
24
Pages
3897-3908
ISSN
  • 0964-6906 (ISSN-L)
  • 1460-2083
OpenAlex
W2136000647
Cited by
352
References
61
Citations by year
2026: 14 · 2025: 10 · 2024: 15 · 2023: 19 · 2022: 21 · 2021: 21 · 2020: 16 · 2019: 18 · 2018: 17 · 2017: 23 · 2016: 18 · 2015: 26 · 2014: 25 · 2013: 21 · 2012: 33
FWCI
12.22
Type
journal article
Language
en
Open access
Locations
  • Human Molecular Genetics (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • York University
  • Institut National de la Santé et de la Recherche Médicale
  • National Institutes of Health
  • National Institute of Neurological Disorders and Stroke
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases
Topics
  • Health Sciences › Medicine › Physiology › Lysosomal Storage Disorders Research
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Health Sciences › Medicine › Rheumatology › Glycogen Storage Diseases and Myoclonus
Keywords
Pompe disease, autophagy, skeletal muscle, acid alpha-glucosidase deficiency, lysosomal glycogen accumulation, ubiquitinated proteins, protein aggregation, muscle damage
MeSH terms
alpha-Glucosidases, Animals, Autophagy, Female, Glycogen Storage Disease Type II, Male, Mice, Transgenic, Muscular Diseases, Proteins, Mice, Knockout, Muscle, Skeletal, Mice, Ubiquitination

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