A truncated Wnt7a retains full biological activity in skeletal muscle.

A truncated Wnt7a retains full biological activity in skeletal muscle.
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DOI:
10.1038/ncomms3869
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发表时间:
2013
影响因子:
16.6
通讯作者:
Rudnicki, Michael A.
Rudnicki, Michael A.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
von Maltzahn, Julia;Zinoviev, Radoslav;Chang, Natasha C.;Bentzinger, C. Florian;Rudnicki, Michael A.

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Wnt信号在胚胎发育和组织稳态中起重要作用。Wnt蛋白是后修饰的,并且棕榈酸酯部分在两个保守残基处的连接被认为是Wnt蛋白分泌和功能的先决条件。在这里,我们证明了哺乳动物Wnt蛋白可以是完全功能性的,没有棕榈酰化。我们生成了一个截短的Wnt 7a变体,由C-末端137个氨基酸组成,缺乏保守的棕榈酰化位点,并表明它在骨骼肌中保留了完整的生物活性。这包括与其受体Fzd 7结合并通过其受体Fzd 7进行信号传导,以通过激活平面细胞极性途径刺激卫星干细胞的对称扩增,并通过AKT/mTOR途径进行信号传导诱导肌纤维肥大。此外,与全长蛋白质相比,这种截短的Wnt 7a显示出增强的分泌和分散。总之,这些发现为开发Wnt 7a作为肌肉消耗性疾病的治疗开辟了重要的新途径,并对Wnt作为生物制剂的治疗用途具有广泛的影响。 Wnt 7a调节骨骼肌功能的各个方面。在这里,作者表明,缺乏棕榈酰化结构域的截短Wnt 7a蛋白保留了其在骨骼肌中的生物活性,这表明简化的Wnt 7a蛋白可能作为基于Wnt的治疗剂是可行的。
Wnt signaling has essential roles during embryonic development and tissue homoeostasis. Wnt proteins are post-translationally modified and the attachment of a palmitate moiety at two conserved residues is believed to be a prerequisite for the secretion and function of Wnt proteins. Here we demonstrate that a mammalian Wnt protein can be fully functional without palmitoylation. We generate a truncated Wnt7a variant, consisting of the C-terminal 137 amino acids lacking the conserved palmitoylation sites and show that it retains full biological activity in skeletal muscle. This includes binding to and signaling through its receptor Fzd7 to stimulate symmetric expansion of satellite stem cells by activating the planar-cell polarity pathway and inducing myofibre hypertrophy by signaling through the AKT/mTOR pathway. Furthermore, this truncated Wnt7a shows enhanced secretion and dispersion compared with the full-length protein. Together, these findings open important new avenues for the development of Wnt7a as a treatment for muscle-wasting diseases and have broad implications for the therapeutic use of Wnts as biologics. Wnt7a regulates various aspects of skeletal muscle function. Here, the authors show that a truncated Wnt7a protein lacking the palmitoylation domain retains its biological activity in skeletal muscle, suggesting that simplified Wnt7a proteins may be viable as Wnt-based therapeutics.
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