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Axon guidance by molecular gradients.
1Department of Anatomy, University of California, San Francisco 94143-0452.
Current Opinion in Neurobiology
|February 1, 1992
Summary
Developing axons are guided by target cell chemoattractants and can also orient along immobilized molecular gradients. This research advances understanding of neural development and axon guidance mechanisms.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- Axon guidance is crucial for establishing neural circuits.
- Chemoattractants secreted by target cells are known to guide developing axons.
- The role of substrate-bound molecules in axon guidance requires further elucidation.
Purpose of the Study:
- To consolidate evidence for chemoattractant-mediated axon guidance.
- To investigate novel mechanisms of axon guidance, specifically in response to immobilized substrate molecules.
Main Methods:
- Review and synthesis of recent evidence on axon guidance.
- Experimental investigation of axon behavior in response to defined substrate gradients.
Main Results:
- Accumulating evidence supports chemoattractant gradients guiding developing axons to targets.
- First-time demonstration that axons can orient along smooth gradients of immobilized substrate molecules.
Conclusions:
- Developing axons utilize both diffusible and substrate-bound cues for navigation.
- This dual guidance mechanism enhances the precision of neural wiring during development.