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• W3167242757 endingPage "6636" @default.
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• W3167242757 abstract "Axons navigate through the embryo to construct a functional nervous system. A missing part of the axon navigation puzzle is how a single axon traverses distinct anatomic choice points through its navigation. The dorsal root ganglia (DRG) neurons experience such choice points. First, they navigate to the dorsal root entry zone (DREZ), then halt navigation in the peripheral nervous system to invade the spinal cord, and then reinitiate navigation inside the CNS. Here, we used time-lapse super-resolution imaging in zebrafish DRG pioneer neurons to investigate how embryonic axons control their cytoskeleton to navigate to and invade at the correct anatomic position. We found that invadopodia components form in the growth cone even during filopodia-based navigation, but only stabilize when the axon is at the spinal cord entry location. Further, we show that intermediate levels of DCC and cAMP, as well as Rac1 activation, subsequently engage an axon invasion brake. Our results indicate that actin-based invadopodia components form in the growth cone and disruption of the invasion brake causes axon entry defects and results in failed behavioral responses, thereby demonstrating the importance of regulating distinct actin populations during navigational challenges. <b>SIGNIFICANCE STATEMENT</b> Correct spatiotemporal navigation of neuronal growth cones is dependent on extracellular navigational cues and growth cone dynamics. Here, we link <i>dcc</i>-mediated signaling to actin-based invadopodia and filopodia dynamics during pathfinding and entry into the spinal cord using an <i>in vivo</i> model of dorsal root ganglia (DRG) sensory axons. We reveal a molecularly-controlled brake on invadopodia stabilization until the sensory neuron growth cone is present at the dorsal root entry zone (DREZ), which is ultimately essential for growth cone entry into the spinal cord and behavioral response." @default.
• W3167242757 created "2021-06-22" @default.
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• W3167242757 date "2021-06-15" @default.
• W3167242757 modified "2023-10-12" @default.
• W3167242757 title "Pioneer Axons Utilize a <i>Dcc</i> Signaling-Mediated Invasion Brake to Precisely Complete Their Pathfinding Odyssey" @default.
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• W3167242757 doi "https://doi.org/10.1523/jneurosci.0212-21.2021" @default.
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