Cited by 63Amyotrophic Lateral Sclerosis ResearchMuscle Physiology and DisordersGenetic Neurodegenerative Diseases

Differential autophagy power in the spinal cord and muscle of transgenic ALS mice

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Crippa, Valeria, Boncoraglio, Alessandra, Galbiati, Mariarita, Aggarwal, Tanya, Rusmini, Paola, Giorgetti, Elisa, Cristofani, Riccardo, Carra, Serena +2 more·2013·Frontiers in Cellular Neuroscience

Abstract

Amyotrophic lateral sclerosis (ALS) is a motoneuron disease characterized by misfolded proteins aggregation in affected motoneurons. In mutant SOD1 (mutSOD1) ALS models, aggregation correlates to impaired functions of proteasome and/or autophagy, both essential for the intracellular chaperone-mediated protein quality control (PQC), and to a reduced mutSOD1 clearance from motoneurons. Skeletal muscle cells are also sensitive to mutSOD1 toxicity, but no mutSOD1 aggregates are formed in these cells, that might better manage mutSOD1 than motoneurons. Thus, we analyzed in spinal cord and in muscle of transgenic (tg) G93A-SOD1 mice at presymptomatic (PS, 8 weeks) and symptomatic (S, 16 weeks) stages, and in age-matched control mice, whether mutSOD1 differentially modulates relevant PQC players, such as HSPB8, BAG3, and BAG1. Possible sex differences were also considered. No changes of HSPB8, BAG3, and BAG1 at PS stage (8 weeks) were seen in all tissues examined in tg G93A-SOD1 and control mice. At S stage (16 weeks), HSPB8 dramatically increased in skeletal muscle of tg G93A-SOD1 mice, while a minor increase occurred in spinal cord of male, but not female tg G93A-SOD1 mice. BAG3 expression increased both in muscle and spinal cord of tg G93A-SOD1 mice at S stage, BAG1 expression increased only in muscle of the same mice. Since, HSPB8-BAG3 complex assists mutSOD1 autophagic removal, we analyzed two well-known autophagic markers, LC3 and p62. Both LC3 and p62 mRNAs were significantly up-regulated in skeletal muscle of tg G93A-SOD1 mice at S stage (16 weeks). This suggests that mutSOD1 expression induces a robust autophagic response specifically in muscle. Together these results demonstrate that, in muscle mutSOD1-induced autophagic response is much higher than in spinal cord. In addition, if mutSOD1 exerts toxicity in muscle, this may not be mediated by misfolded proteins accumulation. It remains unclear whether in muscle mutSOD1 toxicity is related to aberrant autophagy activation.

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Authors
Crippa, V., Boncoraglio, A., Galbiati, M., Aggarwal, T., Rusmini, P., Giorgetti, E., Cristofani, R., Carra, S., Pennuto, M., & Poletti, A.
Affiliations
  • University of Milan (IT)
  • University Medical Center Groningen (NL)
  • Italian Institute of Technology (IT)
  • University of Modena and Reggio Emilia (IT)
  • University of Trento (IT)
Corresponding author
Poletti, Angelo
Venue
Frontiers in Cellular Neuroscience
Published
2013
Volume
7
Pages
234-234
ISSN
1662-5102 (ISSN-L)
OpenAlex
W2118760738
Cited by
63
References
80
Citations by year
2026: 3 · 2025: 2 · 2024: 5 · 2023: 4 · 2022: 5 · 2021: 1 · 2020: 5 · 2019: 5 · 2018: 10 · 2017: 7 · 2016: 5 · 2015: 8 · 2014: 3
FWCI
3.39
Type
journal article
Language
de
Open access
Licence
cc-by
Locations
  • Frontiers in Cellular Neuroscience (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Archivio Istituzionale della Ricerca (Universita Degli Studi Di Milano) (submittedVersion, other-oa)
  • IRIS UNIMORE (University of Modena and Reggio Emilia) (submittedVersion, cc-by)
  • Iris (University of Trento) (submittedVersion, cc-by)
  • University of Groningen research database (University of Groningen / Centre for Information Technology) (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • CINECA IRIS Institutial Research Information System (University of Genoa) (submittedVersion)
  • Padua Research Archive (University of Padova) (submittedVersion, cc-by)
Funders
  • Muscular Dystrophy Association (196646)
  • Università degli Studi di Milano
  • Fondazione Cariplo (2008-2307)
  • Regione Lombardia
  • Hsinchu Science Park Bureau, Ministry of Science and Technology, Taiwan
Topics
  • Health Sciences › Medicine › Neurology › Amyotrophic Lateral Sclerosis Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Genetic Neurodegenerative Diseases
Keywords
amyotrophic lateral sclerosis, autophagy, mutant SOD1, protein quality control, HSPB8, BAG3, BAG-1, LC3, p62, skeletal muscle, spinal cord, sex differences, proteasome, protein aggregation

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