The Bone Morphogenetic Protein Roof Plate Chemorepellent Regulates the Rate of Commissural Axonal Growth

  • Phan K
  • Hazen V
  • Frendo M
  • et al.
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Abstract

Commissural spinal axons extend away from the roof plate {(RP)} in response to a chemorepellent mediated by the bone morphogenetic proteins {(BMPs).} Previous studies have focused on the ability of commissural axons to translate a spatial gradient of {BMPs} into directional information in vitro. However, a notable feature of this system in vivo is that the gradient of {BMPs} is thought to act from behind the commissural cell bodies, making it possible for the {BMPs} to have a continued effect on commissural axons as they grow away from the {RP.} Here, we demonstrate that {BMPs} activate the cofilin regulator Lim domain kinase 1 {(Limk1)} to control the rate of commissural axon extension in the dorsal spinal cord. By modulating Limk1 activity in both rodent and chicken commissural neurons, the rate of axon growth can either be stalled or accelerated. Altering the activation state of Limk1 also influences subsequent guidance decisions: accelerated axons make rostrocaudal projection errors while navigating their intermediate target, the floor plate. These results suggest that guidance cues can specify information about the rate of growth, to ensure that axons reach subsequent signals either at particular times or speeds during development.

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APA

Phan, K. D., Hazen, V. M., Frendo, M., Jia, Z., & Butler, S. J. (2010). The Bone Morphogenetic Protein Roof Plate Chemorepellent Regulates the Rate of Commissural Axonal Growth. Journal of Neuroscience, 30(46), 15430–15440. https://doi.org/10.1523/JNEUROSCI.4117-10.2010

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