肌源性外泌体包裹着肌微小 RNA,并参与局部骨骼肌组织通讯。

Muscle-derived exosomes encapsulate myomiRs and are involved in local skeletal muscle tissue communication.

机构信息

Department of Molecular Genetics, Function & Therapy, Cyprus Institute of Neurology & Genetics, Nicosia, Cyprus.

The Cyprus School of Molecular Medicine, Cyprus Institute of Neurology & Genetics, Nicosia, Cyprus.

出版信息

FASEB J. 2021 Feb;35(2):e21279. doi: 10.1096/fj.201902468RR.

Abstract

Exosomes are extracellular vesicles that are released from most cell types encapsulating specific molecular cargo. Exosomes serve as mediators of cell-to-cell and tissue-to-tissue communications under normal and pathological conditions. It has been shown that exosomes carrying muscle-specific miRNAs, myomiRs, are secreted from skeletal muscle cells in vitro and are elevated in the blood of muscle disease patients. The aim of this study was to investigate the secretion of exosomes encapsulating the four myomiRs from skeletal muscle tissues and to assess their role in inter-tissue communication between neighboring skeletal muscles in vivo. We demonstrate, for the first time, that isolated, intact skeletal muscle tissues secrete exosomes encapsulating the four myomiRs, miR-1, miR-133a, miR-133b, and miR-206. Notably, we show that the sorting of the four myomiRs within exosomes varies between skeletal muscles of different muscle fiber-type composition. miR-133a and miR-133b downregulation in TA muscles caused a reduction of their levels in neighboring skeletal muscles and in serum exosomes. In conclusion, our results reveal that skeletal muscle-derived exosomes encapsulate the four myomiRs, some of which enter the blood, while a portion is used for the local communication between proximal muscle tissues. These findings provide important evidence regarding novel pathways implicated in skeletal muscle function.

摘要

外泌体是一种从大多数细胞类型中释放的细胞外囊泡,其中包裹着特定的分子货物。外泌体作为正常和病理条件下细胞间和组织间通讯的介质。已经表明,携带肌肉特异性 miRNA(即肌源性 miRNA,myomiRs)的外泌体可从体外的骨骼肌细胞中分泌出来,并在肌肉疾病患者的血液中升高。本研究的目的是研究从骨骼肌组织中分泌的包裹有四种肌源性 miRNA(miR-1、miR-133a、miR-133b 和 miR-206)的外泌体的分泌情况,并评估它们在体内相邻骨骼肌之间的组织间通讯中的作用。我们首次证明,分离的完整骨骼肌组织会分泌包裹有这四种肌源性 miRNA 的外泌体。值得注意的是,我们表明,这四种肌源性 miRNA 在不同肌纤维类型组成的骨骼肌中外泌体的分拣方式存在差异。TA 肌肉中 miR-133a 和 miR-133b 的下调导致其在相邻骨骼肌和血清外泌体中的水平降低。总之,我们的研究结果表明,骨骼肌衍生的外泌体包裹着这四种肌源性 miRNA,其中一些进入血液,而一部分则用于近端肌肉组织之间的局部通讯。这些发现为骨骼肌功能所涉及的新途径提供了重要证据。

文献AI研究员

20分钟写一篇综述,助力文献阅读效率提升50倍

立即体验

用中文搜PubMed

大模型驱动的PubMed中文搜索引擎

马上搜索