2019
DOI: 10.1523/jneurosci.2832-18.2019
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Skilled Movements in Mice Require Inhibition of Corticospinal Axon Collateral Formation in the Spinal Cord by Semaphorin Signaling

Abstract: Corticospinal (CS) neurons in layer V of the sensorimotor cortex are essential for voluntary motor control. Those neurons project axons to specific segments along the rostro-caudal axis of the spinal cord, and reach their spinal targets by sending collateral branches interstitially along axon bundles. Currently, little is known how CS axon collaterals are formed in the proper spinal cord regions. Here, we show that the semaphorin3A (Sema3A)-neuropilin-1 (Npn-1) signaling pathway is an essential negative regula… Show more

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Cited by 13 publications
(12 citation statements)
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References 58 publications
(90 reference statements)
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“…Sema3A is expressed by activated T cells and downmodulated T cell activation in vitro ( 22 ). Nrp-1, primarily regarded as a receptor for Sema proteins (such as Sema3A) and as a co-receptor for vascular endothelial growth factor family proteins, is expressed by neuronal and endothelial cells and has been reported to serve an essential role in the establishment of both the nervous system and the endothelial network during embryogenesis ( 24 ). NP-1 is also involved in initial cell-cell contact between T cells and antigen presenting cells ( 25 ).…”
Section: Discussionmentioning
confidence: 99%
“…Sema3A is expressed by activated T cells and downmodulated T cell activation in vitro ( 22 ). Nrp-1, primarily regarded as a receptor for Sema proteins (such as Sema3A) and as a co-receptor for vascular endothelial growth factor family proteins, is expressed by neuronal and endothelial cells and has been reported to serve an essential role in the establishment of both the nervous system and the endothelial network during embryogenesis ( 24 ). NP-1 is also involved in initial cell-cell contact between T cells and antigen presenting cells ( 25 ).…”
Section: Discussionmentioning
confidence: 99%
“…Semaphorins, and their receptor plexins, play a key role in axonal guidance, synaptic pruning, regulation of dendritic processes and have been proposed to contribute to the stabilization of synaptic transmission in the developing and mature brain (Alto & Terman, 2017; Carcea et al., 2014; Gu et al., 2019; Koncina et al., 2007; Lett et al., 2009; O'Connor et al., 2009; Orr et al., 2017; Pasterkamp & Giger, 2009; Simonetti et al., 2019). Many semaphorins are secreted into the ECM, where they interact with CSPGs and HSPGs and are incorporated into PNNs (Dick et al., 2013; Fawcett, 2015; Kantor et al., 2004; Yuzaki, 2018).…”
Section: Discussionmentioning
confidence: 99%
“…Alternatively, the cortico-reticulo-spinal pathway might mediate the descending motor component in both uninjured and SCI rats (Baker and Perez, 2017;Asboth et al, 2018;Engmann et al, 2020). Although the 2-virus inactivation strategy is highly selective for the CST, this might also inactivate cortico-reticular connections; pyramidal neurons in the motor cortex send projections to many subcortical targets, including the medullary reticular formation and the spinal cord (Bastmeyer and O'Leary, 1996;Gu et al, 2019) So inactivation of the CST may also inactivate cortical connections to the reticular formation. We intend to test the idea directly by inactivating the reticulospinal tract in rats with and without SCI.…”
Section: Scap Effective In Rats With Moderate Cervical Scimentioning
confidence: 99%