4.7 Article

Semaphorin3D regulates axon-axon interactions by modulating levels of l1 cell adhesion molecule

Journal

JOURNAL OF NEUROSCIENCE
Volume 27, Issue 36, Pages 9653-9663

Publisher

SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.1741-07.2007

Keywords

semaphorin; L1; axon guidance; fasciculation; adhesion; zebrafish

Categories

Funding

  1. NIGMS NIH HHS [T32 GM07507, T32 GM007507] Funding Source: Medline
  2. NINDS NIH HHS [F31 NS054430, R01 NS042228, 1F31NS054430, R56 NS042228, NS042228] Funding Source: Medline

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The decision of a growing axon to selectively fasciculate with and defasciculate from other axons is critical for axon pathfinding and target innervation. Fasciculation can be regulated by cell adhesion molecules that modulate interaxonal adhesion and repulsive molecules, expressed by surrounding tissues that channel axons together. Here we describe crosstalk between molecules that mediate these mechanisms. We show that Semaphorin3D ( Sema3D), a classic repulsive molecule, promotes fasciculation by regulating L1 CAM levels and axon-axon interactions rather than by creating a repulsive surround. Knockdown experiments show that Sema3D and L1 genetically interact to promote fasciculation. Sema3D overexpression increases and Sema3D knockdown decreases levels of axonal L1 protein. Moreover, excess L1 rescues defasciculation caused by the loss of Sema3D. In vivo time-lapse imaging reveals that Sema3D or L1 knockdown cause identical defects in growth cone behaviors during axon-axon interactions, consistent with a loss of adhesion. These results reveal a novel mechanism by which a semaphorin promotes fasciculation and modulates axon-axon interactions by regulating an adhesion molecule.

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