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Local translation of RhoA regulates growth cone collapse

机译:RhoA的本地翻译调节生长锥的崩溃。

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Neuronal development requires highly coordinated regulation of the cytoskeleton within the developing axon. This dynamic regulation manifests itself in axonal branching, turning and pathfinding, presynaptic differentiation, and growth cone collapse and extension. Semaphorin 3A (Sema3A), a secreted guidance cue that primarily functions to repel axons from inappropriate targets, induces cytoskeletal rearrangements that result in growth cone collapse(1). These effects require intra-axonal messenger RNA translation. Here we show that transcripts for RhoA, a small guanosine triphosphatase ( GTPase) that regulates the actin cytoskeleton, are localized to developing axons and growth cones, and this localization is mediated by an axonal targeting element located in the RhoA 30 untranslated region (UTR). Sema3A induces intra-axonal translation of RhoA mRNA, and this local translation of RhoA is necessary and sufficient for Sema3A-mediated growth cone collapse. These studies indicate that local RhoA translation regulates the neuronal cytoskeleton and identify a new mechanism for the regulation of RhoA signalling.
机译:神经元发育需要高度协调的轴突内的细胞骨架调节。这种动态调节表现为轴突分支,转弯和寻路,突触前分化以及生长锥塌陷和延伸。 Semaphorin 3A(Sema3A)是一种分泌的指导信号,主要起排斥不适当靶标轴突的作用,诱导细胞骨架重排,导致生长锥塌陷(1)。这些作用需要轴突内信使RNA翻译。在这里,我们显示RhoA的转录物,一种调节肌动蛋白细胞骨架的小鸟苷三磷酸酶(GTPase),定位于发育中的轴突和生长锥,并且该定位是由位于RhoA 30非翻译区(UTR)中的轴突靶向元件介导的。 。 Sema3A诱导轴突内RhoA mRNA的翻译,并且RhoA的这种局部翻译对于Sema3A介导的生长锥塌陷是必要且充分的。这些研究表明,局部RhoA翻译调节神经元的细胞骨架,并确定了调节RhoA信号传导的新机制。

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