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Ephrins stimulate or inhibit neurite outgrowth and survival as a function of neuronal cell type
1Department of Chemical Biology, Laboratory for Cancer Research, College of Pharmacy, Rutgers University, NJ, USA.
Abstract:
The Eph family of tyrosine kinase receptors and ligands play key roles in cell segregation and axon targeting in the developing nervous system. Interactions between the ligands and receptors cause repulsion or degeneration of receptor-positive axons from several brain regions including the retina, hippocampus, thalamus, and midbrain dopaminergic system. We extend these previous observations by showing that three A-ephrins also negatively regulate the growth of neurites from striatal and olfactory neurons. In addition to negative effects, however, we also report a trophic activity of the A-ephrins: Ephrin-A2 and A5 promote survival and neurite outgrowth of sympathetic neurons. These observations provide support to the notion that ephrins may function as either negative or positive signals in the developing nervous system.
Insights
Ephrin proteins can inhibit or promote nerve cell growth. These Eph proteins are crucial for nervous system development, guiding cell segregation and axon targeting.
Area of Science:
- Neuroscience
- Molecular Biology
- Developmental Biology
Background:
- Eph receptors and ephrin ligands are critical for nervous system development.
- Their interactions mediate cell segregation and axon guidance.
- Previous studies show repulsive roles in various brain regions.
Purpose of the Study:
- To investigate the role of A-ephrins in neuronal growth.
- To determine if A-ephrins exhibit both inhibitory and supportive functions.
Main Methods:
- Studied the effects of three A-ephrins on neurite outgrowth.
- Examined the impact of Ephrin-A2 and A5 on sympathetic neuron survival and neurite outgrowth.
Main Results:
- A-ephrins negatively regulate neurite growth in striatal and olfactory neurons.
- Ephrin-A2 and A5 demonstrate trophic activity, promoting sympathetic neuron survival and outgrowth.
Conclusions:
- Ephrins can act as dual-function signals in the developing nervous system.
- These findings highlight the complex roles of ephrins in neural development.