Pathogenic role of anti–signal recognition protein and anti–3‐Hydroxy‐3‐methylglutaryl‐CoA reductase antibodies in necrotizing myopathies: Myofiber atrophy and impairment of muscle regeneration in necrotizing autoimmune myopathies

Objective Immune‐mediated necrotizing myopathies (IMNM) may be associated with either anti–signal recognition protein (SRP) or anti–3‐hydroxy‐3‐methylglutaryl‐CoA reductase (HMGCR) antibodies (Abs), and the titer of these Abs is correlated with disease activity. We investigated whether anti‐SRP and...

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Published inAnnals of neurology Vol. 81; no. 4; pp. 538 - 548
Main Authors Arouche‐Delaperche, Louiza, Allenbach, Yves, Amelin, Damien, Preusse, Corinna, Mouly, Vincent, Mauhin, Wladimir, Tchoupou, Gaelle Dzangue, Drouot, Laurent, Boyer, Olivier, Stenzel, Werner, Butler‐Browne, Gillian, Benveniste, Olivier
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LanguageEnglish
Published United States Wiley Subscription Services, Inc 01.04.2017
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Abstract Objective Immune‐mediated necrotizing myopathies (IMNM) may be associated with either anti–signal recognition protein (SRP) or anti–3‐hydroxy‐3‐methylglutaryl‐CoA reductase (HMGCR) antibodies (Abs), and the titer of these Abs is correlated with disease activity. We investigated whether anti‐SRP and anti‐HMGCR Abs could be involved in muscle damage. Methods Muscle biopsies of patients were analyzed for atrophy and regeneration by measuring fiber size and by performing immunostaining of neonatal myosin heavy chain. To further understand the role of the Abs in the pathology, we performed muscle cell coculture with the Abs. Atrophy and regeneration were evaluated based on the myotube surface area as well as gene and cytokine profiles. Results In muscle biopsies of patients with anti‐SRP+ and anti‐HMGCR+ Abs, a large number of small fibers corresponding to both atrophic and regenerating fibers were observed. In vitro, anti‐SRP and anti‐HMGCR Abs induced muscle fiber atrophy and increased the transcription of MAFbx and TRIM63. In addition, the muscle fiber atrophy was associated with high levels of inflammatory cytokines: tumor necrosis factor, interleukin (IL)‐6, and reactive oxygen species. In the presence of anti‐SRP or anti‐HMGCR Abs, mechanisms involved in muscle regeneration were also impaired due to a defect of myoblast fusion. This defect was associated with a decreased production of IL‐4 and IL‐13. The addition of IL‐4 and/or IL‐13 totally rescued fusion capacity. Interpretation These data show that molecular mechanisms of atrophy and regeneration are affected and contribute to loss of muscle function occurring in IMNM. This emphasizes the potential interest of targeted therapies addressing these mechanisms. Ann Neurol 2017;81:538–548
AbstractList OBJECTIVEImmune-mediated necrotizing myopathies (IMNM) may be associated with either anti-signal recognition protein (SRP) or anti-3-hydroxy-3-methylglutaryl-CoA reductase (HMGCR) antibodies (Abs), and the titer of these Abs is correlated with disease activity. We investigated whether anti-SRP and anti-HMGCR Abs could be involved in muscle damage.METHODSMuscle biopsies of patients were analyzed for atrophy and regeneration by measuring fiber size and by performing immunostaining of neonatal myosin heavy chain. To further understand the role of the Abs in the pathology, we performed muscle cell coculture with the Abs. Atrophy and regeneration were evaluated based on the myotube surface area as well as gene and cytokine profiles.RESULTSIn muscle biopsies of patients with anti-SRP+ and anti-HMGCR+ Abs, a large number of small fibers corresponding to both atrophic and regenerating fibers were observed. In vitro, anti-SRP and anti-HMGCR Abs induced muscle fiber atrophy and increased the transcription of MAFbx and TRIM63. In addition, the muscle fiber atrophy was associated with high levels of inflammatory cytokines: tumor necrosis factor, interleukin (IL)-6, and reactive oxygen species. In the presence of anti-SRP or anti-HMGCR Abs, mechanisms involved in muscle regeneration were also impaired due to a defect of myoblast fusion. This defect was associated with a decreased production of IL-4 and IL-13. The addition of IL-4 and/or IL-13 totally rescued fusion capacity.INTERPRETATIONThese data show that molecular mechanisms of atrophy and regeneration are affected and contribute to loss of muscle function occurring in IMNM. This emphasizes the potential interest of targeted therapies addressing these mechanisms. Ann Neurol 2017;81:538-548.
Immune-mediated necrotizing myopathies (IMNM) may be associated with either anti-signal recognition protein (SRP) or anti-3-hydroxy-3-methylglutaryl-CoA reductase (HMGCR) antibodies (Abs), and the titer of these Abs is correlated with disease activity. We investigated whether anti-SRP and anti-HMGCR Abs could be involved in muscle damage. Muscle biopsies of patients were analyzed for atrophy and regeneration by measuring fiber size and by performing immunostaining of neonatal myosin heavy chain. To further understand the role of the Abs in the pathology, we performed muscle cell coculture with the Abs. Atrophy and regeneration were evaluated based on the myotube surface area as well as gene and cytokine profiles. In muscle biopsies of patients with anti-SRP and anti-HMGCR Abs, a large number of small fibers corresponding to both atrophic and regenerating fibers were observed. In vitro, anti-SRP and anti-HMGCR Abs induced muscle fiber atrophy and increased the transcription of MAFbx and TRIM63. In addition, the muscle fiber atrophy was associated with high levels of inflammatory cytokines: tumor necrosis factor, interleukin (IL)-6, and reactive oxygen species. In the presence of anti-SRP or anti-HMGCR Abs, mechanisms involved in muscle regeneration were also impaired due to a defect of myoblast fusion. This defect was associated with a decreased production of IL-4 and IL-13. The addition of IL-4 and/or IL-13 totally rescued fusion capacity. These data show that molecular mechanisms of atrophy and regeneration are affected and contribute to loss of muscle function occurring in IMNM. This emphasizes the potential interest of targeted therapies addressing these mechanisms. Ann Neurol 2017;81:538-548.
Objective Immune-mediated necrotizing myopathies (IMNM) may be associated with either anti-signal recognition protein (SRP) or anti-3-hydroxy-3-methylglutaryl-CoA reductase (HMGCR) antibodies (Abs), and the titer of these Abs is correlated with disease activity. We investigated whether anti-SRP and anti-HMGCR Abs could be involved in muscle damage. Methods Muscle biopsies of patients were analyzed for atrophy and regeneration by measuring fiber size and by performing immunostaining of neonatal myosin heavy chain. To further understand the role of the Abs in the pathology, we performed muscle cell coculture with the Abs. Atrophy and regeneration were evaluated based on the myotube surface area as well as gene and cytokine profiles. Results In muscle biopsies of patients with anti-SRP super(+) and anti-HMGCR super(+) Abs, a large number of small fibers corresponding to both atrophic and regenerating fibers were observed. In vitro, anti-SRP and anti-HMGCR Abs induced muscle fiber atrophy and increased the transcription of MAFbx and TRIM63. In addition, the muscle fiber atrophy was associated with high levels of inflammatory cytokines: tumor necrosis factor, interleukin (IL)-6, and reactive oxygen species. In the presence of anti-SRP or anti-HMGCR Abs, mechanisms involved in muscle regeneration were also impaired due to a defect of myoblast fusion. This defect was associated with a decreased production of IL-4 and IL-13. The addition of IL-4 and/or IL-13 totally rescued fusion capacity. Interpretation These data show that molecular mechanisms of atrophy and regeneration are affected and contribute to loss of muscle function occurring in IMNM. This emphasizes the potential interest of targeted therapies addressing these mechanisms. Ann Neurol 2017; 81:538-548
Objective Immune‐mediated necrotizing myopathies (IMNM) may be associated with either anti–signal recognition protein (SRP) or anti–3‐hydroxy‐3‐methylglutaryl‐CoA reductase (HMGCR) antibodies (Abs), and the titer of these Abs is correlated with disease activity. We investigated whether anti‐SRP and anti‐HMGCR Abs could be involved in muscle damage. Methods Muscle biopsies of patients were analyzed for atrophy and regeneration by measuring fiber size and by performing immunostaining of neonatal myosin heavy chain. To further understand the role of the Abs in the pathology, we performed muscle cell coculture with the Abs. Atrophy and regeneration were evaluated based on the myotube surface area as well as gene and cytokine profiles. Results In muscle biopsies of patients with anti‐SRP+ and anti‐HMGCR+ Abs, a large number of small fibers corresponding to both atrophic and regenerating fibers were observed. In vitro, anti‐SRP and anti‐HMGCR Abs induced muscle fiber atrophy and increased the transcription of MAFbx and TRIM63. In addition, the muscle fiber atrophy was associated with high levels of inflammatory cytokines: tumor necrosis factor, interleukin (IL)‐6, and reactive oxygen species. In the presence of anti‐SRP or anti‐HMGCR Abs, mechanisms involved in muscle regeneration were also impaired due to a defect of myoblast fusion. This defect was associated with a decreased production of IL‐4 and IL‐13. The addition of IL‐4 and/or IL‐13 totally rescued fusion capacity. Interpretation These data show that molecular mechanisms of atrophy and regeneration are affected and contribute to loss of muscle function occurring in IMNM. This emphasizes the potential interest of targeted therapies addressing these mechanisms. Ann Neurol 2017;81:538–548
Objective Immune-mediated necrotizing myopathies (IMNM) may be associated with either anti-signal recognition protein (SRP) or anti-3-hydroxy-3-methylglutaryl-CoA reductase (HMGCR) antibodies (Abs), and the titer of these Abs is correlated with disease activity. We investigated whether anti-SRP and anti-HMGCR Abs could be involved in muscle damage. Methods Muscle biopsies of patients were analyzed for atrophy and regeneration by measuring fiber size and by performing immunostaining of neonatal myosin heavy chain. To further understand the role of the Abs in the pathology, we performed muscle cell coculture with the Abs. Atrophy and regeneration were evaluated based on the myotube surface area as well as gene and cytokine profiles. Results In muscle biopsies of patients with anti-SRP+ and anti-HMGCR+ Abs, a large number of small fibers corresponding to both atrophic and regenerating fibers were observed. In vitro, anti-SRP and anti-HMGCR Abs induced muscle fiber atrophy and increased the transcription of MAFbx and TRIM63. In addition, the muscle fiber atrophy was associated with high levels of inflammatory cytokines: tumor necrosis factor, interleukin (IL)-6, and reactive oxygen species. In the presence of anti-SRP or anti-HMGCR Abs, mechanisms involved in muscle regeneration were also impaired due to a defect of myoblast fusion. This defect was associated with a decreased production of IL-4 and IL-13. The addition of IL-4 and/or IL-13 totally rescued fusion capacity. Interpretation These data show that molecular mechanisms of atrophy and regeneration are affected and contribute to loss of muscle function occurring in IMNM. This emphasizes the potential interest of targeted therapies addressing these mechanisms. Ann Neurol 2017;81:538-548
Author Tchoupou, Gaelle Dzangue
Arouche‐Delaperche, Louiza
Stenzel, Werner
Drouot, Laurent
Butler‐Browne, Gillian
Preusse, Corinna
Mauhin, Wladimir
Boyer, Olivier
Mouly, Vincent
Allenbach, Yves
Benveniste, Olivier
Amelin, Damien
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SSID ssj0009610
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Snippet Objective Immune‐mediated necrotizing myopathies (IMNM) may be associated with either anti–signal recognition protein (SRP) or...
Immune-mediated necrotizing myopathies (IMNM) may be associated with either anti-signal recognition protein (SRP) or anti-3-hydroxy-3-methylglutaryl-CoA...
Objective Immune-mediated necrotizing myopathies (IMNM) may be associated with either anti-signal recognition protein (SRP) or...
OBJECTIVEImmune-mediated necrotizing myopathies (IMNM) may be associated with either anti-signal recognition protein (SRP) or...
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pubmed
wiley
SourceType Open Access Repository
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StartPage 538
SubjectTerms Antibodies
Atrophy
Atrophy - pathology
Autoantibodies - immunology
Autoimmune Diseases - immunology
Autoimmune Diseases - pathology
Autoimmune Diseases - physiopathology
Biopsy
Cell culture
Cell Culture Techniques
Chains
Correlation
Cytokines
Damage
Fibers
Human health and pathology
Humans
Hydroxymethylglutaryl CoA Reductases - immunology
Hydroxymethylglutaryl-CoA reductase
Immunology
Impairment
In vitro methods and tests
Inflammation
Interleukin 13
Interleukin 4
Life Sciences
Molecular modelling
Muscle Fibers, Skeletal - immunology
Muscle Fibers, Skeletal - pathology
Muscle Fibers, Skeletal - physiology
Muscular Diseases - immunology
Muscular Diseases - pathology
Muscular Diseases - physiopathology
Myosin
Necrosis - pathology
Neonates
Oxygen
Pathology
Patients
Reactive oxygen species
Recognition
Regeneration
Regeneration - physiology
Signal Recognition Particle - immunology
Surface area
Tissue Banks
Transcription
Tumor necrosis factor
Title Pathogenic role of anti–signal recognition protein and anti–3‐Hydroxy‐3‐methylglutaryl‐CoA reductase antibodies in necrotizing myopathies: Myofiber atrophy and impairment of muscle regeneration in necrotizing autoimmune myopathies
URI https://onlinelibrary.wiley.com/doi/abs/10.1002%2Fana.24902
https://www.ncbi.nlm.nih.gov/pubmed/28224701
https://www.proquest.com/docview/1890507937/abstract/
https://www.proquest.com/docview/1910217788/abstract/
https://search.proquest.com/docview/1870985324
https://search.proquest.com/docview/1897389792
https://hal.science/hal-02377502
Volume 81
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