Bidirectional Eph-ephrin Signaling During Axon Guidance

Trends Cell Biol. 2007 May;17(5):230-8. doi: 10.1016/j.tcb.2007.03.004. Epub 2007 Apr 8.

Abstract

Ephrins are cell-surface tethered guidance cues that bind to Eph receptor tyrosine kinases in trans on opposing cells. In the developing nervous system, the Eph-ephrin signaling system controls a large variety of cellular responses including contact-mediated attraction or repulsion, adhesion or de-adhesion, and migration. Eph-ephrin signaling can be bidirectional, and is subject to modulation by ectodomain cleavage of ephrins and by Eph-ephrin endocytosis. Recent work has highlighted the importance of higher-order clustering of functional Eph-ephrin complexes and the requirement for Rho GTPases as signal transducers. Co-expression of Ephs and ephrins within the same cellular membrane can result in Eph-ephrin cis interaction or in lateral segregation into distinct domains from where they signal opposing effects on the axon.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Animals
  • Axons / physiology*
  • Endocytosis
  • Ephrins / physiology*
  • Signal Transduction / physiology*
  • rho GTP-Binding Proteins / physiology

Substances

  • Ephrins
  • rho GTP-Binding Proteins