纤毛、中心体与骨骼肌。

Cilia, Centrosomes and Skeletal Muscle.

机构信息

School of Biomedical Science, Faculty of Medicine, University of Queensland, St Lucia, Brisbane, QLD 4072, Australia.

School of Human Sciences, Faculty of Medicine, University of Western Australia, Perth, WA 6009, Australia.

出版信息

Int J Mol Sci. 2021 Sep 4;22(17):9605. doi: 10.3390/ijms22179605.

Abstract

Primary cilia are non-motile, cell cycle-associated organelles that can be found on most vertebrate cell types. Comprised of microtubule bundles organised into an axoneme and anchored by a mature centriole or basal body, primary cilia are dynamic signalling platforms that are intimately involved in cellular responses to their extracellular milieu. Defects in ciliogenesis or dysfunction in cilia signalling underlie a host of developmental disorders collectively referred to as ciliopathies, reinforcing important roles for cilia in human health. Whilst primary cilia have long been recognised to be present in striated muscle, their role in muscle is not well understood. However, recent studies indicate important contributions, particularly in skeletal muscle, that have to date remained underappreciated. Here, we explore recent revelations that the sensory and signalling functions of cilia on muscle progenitors regulate cell cycle progression, trigger differentiation and maintain a commitment to myogenesis. Cilia disassembly is initiated during myoblast fusion. However, the remnants of primary cilia persist in multi-nucleated myotubes, and we discuss their potential role in late-stage differentiation and myofiber formation. Reciprocal interactions between cilia and the extracellular matrix (ECM) microenvironment described for other tissues may also inform on parallel interactions in skeletal muscle. We also discuss emerging evidence that cilia on fibroblasts/fibro-adipogenic progenitors and myofibroblasts may influence cell fate in both a cell autonomous and non-autonomous manner with critical consequences for skeletal muscle ageing and repair in response to injury and disease. This review addresses the enigmatic but emerging role of primary cilia in satellite cells in myoblasts and myofibers during myogenesis, as well as the wider tissue microenvironment required for skeletal muscle formation and homeostasis.

摘要

初级纤毛是无运动能力的、与细胞周期相关的细胞器,可在大多数脊椎动物细胞类型中发现。由组织成轴丝的微管束和成熟中心粒或基体锚定,初级纤毛是细胞对细胞外环境的反应的动态信号平台,与细胞对细胞外环境的反应密切相关。纤毛发生缺陷或纤毛信号功能障碍是一组被称为纤毛病的发育障碍的基础,这强化了纤毛在人类健康中的重要作用。虽然初级纤毛在横纹肌中早已被发现,但它们在肌肉中的作用尚未被很好地理解。然而,最近的研究表明,初级纤毛在骨骼肌中具有重要的作用,这些作用迄今为止尚未得到充分认识。在这里,我们探讨了最近的发现,即肌肉祖细胞上纤毛的感觉和信号功能调节细胞周期进程,触发分化,并维持向肌生成的承诺。纤毛解聚在成肌细胞融合期间开始。然而,初级纤毛的残留物存在于多核的肌管中,我们讨论了它们在晚期分化和肌纤维形成中的潜在作用。描述的其他组织中的纤毛和细胞外基质 (ECM) 微环境之间的相互作用也可能为骨骼肌中的平行相互作用提供信息。我们还讨论了新出现的证据,即成纤维细胞/成纤维脂肪祖细胞和成肌纤维细胞上的纤毛可能以自主和非自主的方式影响细胞命运,这对骨骼肌衰老和损伤后的修复具有关键影响疾病。本综述探讨了初级纤毛在成肌细胞和肌纤维中的卫星细胞中的神秘但新兴作用,以及形成和维持骨骼肌所需的更广泛的组织微环境。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cbc3/8431768/6e418fb8b611/ijms-22-09605-g001.jpg

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