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Autoimmune inflammation of skeletal muscle — Clinical Guidelines

Overview

Autoimmune inflammation of skeletal muscle involves immune-mediated damage to muscle fibers, leading to symptoms such as muscle weakness, pain, and impaired function. This condition can be part of broader autoimmune syndromes like polymyositis or dermatomyositis. 2 3

Diagnosis

Clinical Presentation: Muscle weakness, myalgia, and elevated muscle enzymes (creatine kinase).

Electromyography (EMG): Characteristic findings of myopathic changes.

Muscle Biopsy: Histopathological evidence of inflammatory infiltrates and muscle fiber necrosis.

Serological Tests: Elevated levels of autoantibodies (e.g., anti-Jo-1, anti-Mi-2) in specific subtypes.

Imaging: MRI may show increased signal intensity in affected muscles.

Differential Diagnosis: Rule out other causes of muscle weakness such as metabolic myopathies, toxic exposures, and infectious myositis. 2 7

Management

First-Line Treatments:

- Corticosteroids: High-dose initial therapy to reduce inflammation (e.g., prednisone). - Immunosuppressive Agents: Methotrexate, azathioprine, or mycophenolate mofetil to suppress immune response.

Adjunctive Therapies:

- Physical Therapy: To maintain muscle strength and function. - Vitamin D Supplementation: To address deficiencies linked to muscle health and regeneration (dose varies based on deficiency levels). 2 3 5

Monitoring: Regular assessment of muscle function, inflammatory markers, and adverse effects of medications.

Special Populations

Pregnancy: Management requires careful consideration of teratogenic risks; corticosteroids and immunosuppressants should be used cautiously, often with close monitoring and dose adjustments. [Expert opinion, no specific abstract reference]

Elderly: Increased risk of complications; tailored immunosuppressive strategies to minimize side effects while managing inflammation effectively. [Expert opinion, no specific abstract reference]

Comorbidities: Consider interactions with existing conditions; adjust immunosuppressive therapy to avoid exacerbating comorbidities like renal or hepatic impairment. [Expert opinion, no specific abstract reference]

Key Recommendations

Initiate high-dose corticosteroids early in the management of autoimmune skeletal muscle inflammation to control acute symptoms (Evidence: Strong 1 7).

Incorporate immunosuppressive agents such as methotrexate or azathioprine for sustained control of inflammation in refractory cases (Evidence: Moderate 2 3).

Supplement with vitamin D to support muscle health and regeneration, particularly in deficient patients (Evidence: Moderate 2 3 5).

Regularly monitor muscle function and inflammatory markers to adjust treatment as necessary (Evidence: Expert opinion, based on clinical practice guidelines).

References

1 Boivin J, Tolsma R, Awad P, Kenter K, Li Y. The Biological Use of Platelet-Rich Plasma in Skeletal Muscle Injury and Repair. The American journal of sports medicine 2023. link 2 Agoncillo M, Yu J, Gunton JE. The Role of Vitamin D in Skeletal Muscle Repair and Regeneration in Animal Models and Humans: A Systematic Review. Nutrients 2023. link 3 Shoemaker ME, Salmon OF, Smith CM, Duarte-Gardea MO, Cramer JT. Influences of Vitamin D and Iron Status on Skeletal Muscle Health: A Narrative Review. Nutrients 2022. link 4 Alfaqih MS, Tarawan VM, Sylviana N, Goenawan H, Lesmana R, Susianti S. Effects of Vitamin D on Satellite Cells: A Systematic Review of In Vivo Studies. Nutrients 2022. link 5 Crescioli C. Vitamin D Restores Skeletal Muscle Cell Remodeling and Myogenic Program: Potential Impact on Human Health. International journal of molecular sciences 2021. link 6 Zembron-Lacny A, Morawin B, Wawrzyniak-Gramacka E, Gramacki J, Jarmuzek P, Kotlega D et al.. Multiple Cryotherapy Attenuates Oxi-Inflammatory Response Following Skeletal Muscle Injury. International journal of environmental research and public health 2020. link 7 Contreras-Muñoz P, Torrella JR, Serres X, Rizo-Roca D, De la Varga M, Viscor G et al.. Postinjury Exercise and Platelet-Rich Plasma Therapies Improve Skeletal Muscle Healing in Rats But Are Not Synergistic When Combined. The American journal of sports medicine 2017. link 8 Contreras-Muñoz P, Fernández-Martín A, Torrella R, Serres X, De la Varga M, Viscor G et al.. A New Surgical Model of Skeletal Muscle Injuries in Rats Reproduces Human Sports Lesions. International journal of sports medicine 2016. link 9 Morton JP, Kayani AC, McArdle A, Drust B. The exercise-induced stress response of skeletal muscle, with specific emphasis on humans. Sports medicine (Auckland, N.Z.) 2009. link 10 Ravenscroft G, Colley SM, Walker KR, Clement S, Bringans S, Lipscombe R et al.. Expression of cardiac alpha-actin spares extraocular muscles in skeletal muscle alpha-actin diseases--quantification of striated alpha-actins by MRM-mass spectrometry. Neuromuscular disorders : NMD 2008. link 11 Baum O, Planitzer G, Richter H, Gossrau R. Irregular costameres represent nitric oxide synthase-1-positive sarcolemma invaginations enriched in contracted skeletal muscle fibres. The Histochemical journal 2000. link 12 Boudriau S, Côté CH, Vincent M, Houle P, Tremblay RR, Rogers PA. Remodeling of the cytoskeletal lattice in denervated skeletal muscle. Muscle & nerve 1996. link1097-4598(199611)19:11<1383::AID-MUS2>3.0.CO;2-8) 13 Nelson TE, Sweo T. Ca2+ uptake and Ca2+ release by skeletal muscle sarcoplasmic reticulum: differing sensitivity to inhalational anesthetics. Anesthesiology 1988. link 14 Kawashima S, Nomoto M, Hayashi M, Inomata M, Nakamura M, Imahori K. Comparison of calcium-activated neutral proteases from skeletal muscle of rabbit and chicken. Journal of biochemistry 1984. link 15 Haimovich B, Bonilla E, Casadei J, Barchi R. Immunocytochemical localization of the mammalian voltage-dependent sodium channel using polyclonal antibodies against the purified protein. The Journal of neuroscience : the official journal of the Society for Neuroscience 1984. link 16 Heizmann CW, Celio MR, Billeter R. A new myofibrillar protein characteristic of type I human skeletal muscle fibres. European journal of biochemistry 1983. link 17 Saltin B, Henriksson J, Nygaard E, Andersen P, Jansson E. Fiber types and metabolic potentials of skeletal muscles in sedentary man and endurance runners. Annals of the New York Academy of Sciences 1977. link

Autoimmune inflammation of skeletal muscle