Slow or fast: Implications of myofibre type and associated differences for manifestation of neuromuscular disorders

医学 物理医学与康复 神经肌肉疾病 神经科学 生物信息学 心理学 生物 内科学 疾病
作者
Erin M. Lloyd,Gavin J. Pinniger,Robyn M. Murphy,Miranda D. Grounds
出处
期刊:Acta Physiologica [Wiley]
卷期号:238 (4) 被引量:16
标识
DOI:10.1111/apha.14012
摘要

Abstract Many neuromuscular disorders can have a differential impact on a specific myofibre type, forming the central premise of this review. The many different skeletal muscles in mammals contain a spectrum of slow‐ to fast‐twitch myofibres with varying levels of protein isoforms that determine their distinctive contractile, metabolic, and other properties. The variations in functional properties across the range of classic ‘slow’ to ‘fast’ myofibres are outlined, combined with exemplars of the predominantly slow‐twitch soleus and fast‐twitch extensor digitorum longus muscles, species comparisons, and techniques used to study these properties. Other intrinsic and extrinsic differences are discussed in the context of slow and fast myofibres. These include inherent susceptibility to damage, myonecrosis, and regeneration, plus extrinsic nerves, extracellular matrix, and vasculature, examined in the context of growth, ageing, metabolic syndrome, and sexual dimorphism. These many differences emphasise the importance of carefully considering the influence of myofibre‐type composition on manifestation of various neuromuscular disorders across the lifespan for both sexes. Equally, understanding the different responses of slow and fast myofibres due to intrinsic and extrinsic factors can provide deep insight into the precise molecular mechanisms that initiate and exacerbate various neuromuscular disorders. This focus on the influence of different myofibre types is of fundamental importance to enhance translation for clinical management and therapies for many skeletal muscle disorders.
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