Fibroblast fusion to the muscle fiber regulates myotendinous junction formation.

Fibroblast fusion to the muscle fiber regulates myotendinous junction formation.
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成纤维细胞融合到肌肉纤维可调节肌肌的形成。

DOI:
10.1038/s41467-021-24159-9
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发表时间:
2021-06-22
影响因子:
16.6
通讯作者:
Hasson P
Hasson P
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Yaseen W;Kraft-Sheleg O;Zaffryar-Eilot S;Melamed S;Sun C;Millay DP;Hasson P

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脊椎动物的肌肉和肌腱来自不同的胚胎起源,但它们必须相互作用,以促进肌肉收缩和身体运动。肌肉肌腱连接(MTJ)如何形成强大的能够承受收缩力仍然不清楚。使用单细胞分辨率的技术,我们重新审视组成肌肉骨骼系统的组织的不同身份的经典观点。我们确定了成纤维细胞,已经打开了生肌程序,并证明这些双重身份的细胞融合到发育中的肌纤维沿着的MTJ促进成纤维细胞特异性转录到延长肌纤维的介绍。我们认为,这种机制导致混合肌纤维,主要是沿着纤维尖端,使从肌纤维特征到肌腱特征的平滑过渡成为形成强大的MTJ所必需的。我们认为,连接细胞的双重特征可能是整个肌肉骨骼系统组织之间产生稳定相互作用的共同机制。经典地,肌源性前体细胞来源于体节,并且结缔组织来源于侧板中胚层(LPM)。在这里,作者鉴定了LPM来源的成纤维细胞,这些成纤维细胞开启生肌程序并在肌肉-肌腱连接处与肌纤维融合,将成纤维细胞转录物引入肌纤维。
Vertebrate muscles and tendons are derived from distinct embryonic origins yet they must interact in order to facilitate muscle contraction and body movements. How robust muscle tendon junctions (MTJs) form to be able to withstand contraction forces is still not understood. Using techniques at a single cell resolution we reexamine the classical view of distinct identities for the tissues composing the musculoskeletal system. We identify fibroblasts that have switched on a myogenic program and demonstrate these dual identity cells fuse into the developing muscle fibers along the MTJs facilitating the introduction of fibroblast-specific transcripts into the elongating myofibers. We suggest this mechanism resulting in a hybrid muscle fiber, primarily along the fiber tips, enables a smooth transition from muscle fiber characteristics towards tendon features essential for forming robust MTJs. We propose that dual characteristics of junctional cells could be a common mechanism for generating stable interactions between tissues throughout the musculoskeletal system. Classically, myogenic precursor cells derive from somites, and connective tissues derive from lateral plate mesoderm (LPM). Here the authors identify LPM derived fibroblasts that turn on a myogenic program and fuse to muscle fibers at muscle-tendon junctions, introducing fibroblast transcripts into myofibers.
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