Clathrin adaptor GGA1 modulates myogenesis of C2C12 myoblasts.

Clathrin adaptor GGA1 modulates myogenesis of C2C12 myoblasts.
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DOI:
10.1371/journal.pone.0207533
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发表时间:
2018
期刊:
影响因子:
3.7
通讯作者:
Kametaka S
Kametaka S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Isobe M;Lee S;Waguri S;Kametaka S

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在肌发生过程中,肌源性干细胞经历了几个连续的事件,包括细胞分裂、迁移和细胞-细胞融合,导致多核肌管的形成,这是肌纤维的前体。为了了解这些复杂过程的分子机制,使用了基于RNA干扰的基因耗尽方法。在培养的小鼠成肌细胞系C2C12细胞中,发现高尔基相关的含有γ适应蛋白耳的ARF结合蛋白1 (GGA1)是高尔基蛋白驻留的单体网格蛋白适配体,在肌管形成过程中是必需的。在肌发生过程中,Gga1 mRNA表达上调,Gga1缺失阻止了大的多核肌管的形成。此外,在Gga1敲低的成肌细胞中,溶酶体蛋白酶的抑制增加了胰岛素受体的数量,这表明Gga1参与了胰岛素受体的细胞表面表达和分选。这些结果表明,GGA1通过靶向胰岛素受体到细胞表面建立功能成熟的肌纤维,在肌管的形成和成熟中发挥重要作用。
During myogenesis, myogenic stem cells undergo several sequential events, including cell division, migration, and cell-cell fusion, leading to the formation of multinuclear myotubes, which are the precursors of myofibers. To understand the molecular mechanisms underlying these complex processes, an RNA interference-based gene depletion approach was used. Golgi associated, gamma adaptin ear containing, ARF binding protein 1 (GGA1), a Golgi-resident monomeric clathrin adaptor, was found to be required for the process of myotube formation in C2C12 cells, a cultured murine myoblast cell line. Gga1 mRNA expression was upregulated during myogenesis, and Gga1 depletion prevented the formation of large multi-nucleated myotubes. Moreover, inhibition of lysosomal proteases in Gga1 knockdown myoblasts increased the amount of insulin receptor, suggesting that GGA1 is involved in the cell surface expression and sorting of the insulin receptor. These results suggested that GGA1 plays a significant role in the formation and maturation of myotubes by targeting the insulin receptor to the cell surface to establish functionally mature myofibers.
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