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Axon Guidance and Neuronal Signaling
Research Guide
What is Axon Guidance and Neuronal Signaling?
Axon guidance and neuronal signaling refers to the molecular mechanisms and signaling pathways, including Eph receptors, Semaphorins, Netrins, and receptor tyrosine kinases, that regulate growth cone dynamics, neuronal polarity, axon pathfinding, and vascular patterning during neural development.
This field encompasses 29,922 published works examining how guidance cues direct neuronal growth cones via contact attraction, chemoattraction, chemorepulsion, and contact repulsion. Key molecules such as Eph receptors, Semaphorins, and Netrins interact with receptor tyrosine kinases to control axon navigation and neural circuit formation. Growth in this area over the past five years is not quantified in available data.
Topic Hierarchy
Research Sub-Topics
Eph Receptor Mediated Axon Repulsion
This sub-topic details Eph-ephrin signaling in growth cone collapse and repulsion during topographic mapping. Researchers dissect downstream pathways like Rho GTPases in axon pathfinding.
Semaphorin Signaling in Axon Guidance
Focuses on plexin-neuropilin receptors transducing semaphorin cues for attraction or repulsion in neural circuits. Studies explore plexin crosstalk and cytoskeletal dynamics in growth cones.
Netrin Mediated Axon Attraction
Examines DCC/UNC-5 receptor complexes in netrin-induced chemoattraction and branching. Research uses live imaging to study cAMP modulation of attractive turning.
Neuronal Polarity Establishment
This area investigates molecular determinants like PAR proteins and Staufen in specifying axon-dendrite fate. Live-cell studies track polarity cues in cultured neurons.
Growth Cone Dynamics and Cytoskeletal Regulation
Researchers study filopodia lamellipodia dynamics and actin-microtubule coordination in guidance responses. Advanced imaging reveals cue-specific cytoskeletal remodeling.
Why It Matters
Axon guidance and neuronal signaling mechanisms underpin neural development and are implicated in disorders involving disrupted wiring, such as nerve injury and regeneration. Tessier-Lavigne and Goodman (1996) in "The Molecular Biology of Axon Guidance" identified four guidance mechanisms—contact attraction, chemoattraction, chemorepulsion, and contact repulsion—that enable growth cones to navigate to targets, informing strategies for repairing damaged neural pathways. Huang and Reichardt (2001) in "Neurotrophins: Roles in Neuronal Development and Function" showed neurotrophins activate Trk receptor tyrosine kinases and p75NTR to regulate neuronal survival and function, with applications in understanding adult hippocampal neurogenesis as detailed by Eriksson et al. (1998) in "Neurogenesis in the adult human hippocampus," where progenitor proliferation supports hippocampal plasticity. Schlessinger (2000) in "Cell Signaling by Receptor Tyrosine Kinases" outlined signaling cascades essential for these processes, relevant to vascular patterning disruptions seen in angiopoietin-Tie2 interactions described by Maisonpierre et al. (1997).
Reading Guide
Where to Start
"The Molecular Biology of Axon Guidance" by Tessier-Lavigne and Goodman (1996), as it provides a foundational overview of the four core guidance mechanisms and key molecules like Eph receptors, Semaphorins, and Netrins.
Key Papers Explained
Tessier-Lavigne and Goodman (1996) in "The Molecular Biology of Axon Guidance" establishes the molecular framework for growth cone navigation using Eph receptors, Semaphorins, and Netrins. Huang and Reichardt (2001) in "Neurotrophins: Roles in Neuronal Development and Function" builds on this by detailing Trk receptor tyrosine kinase activation by neurotrophins, linking to survival and polarity. Schlessinger (2000) in "Cell Signaling by Receptor Tyrosine Kinases" and Ullrich and Schlessinger (1990) in "Signal transduction by receptors with tyrosine kinase activity" explain the shared signaling cascades. Eriksson et al. (1998) in "Neurogenesis in the adult human hippocampus" and Kuhn et al. (1996) in "Neurogenesis in the dentate gyrus of the adult rat: age-related decrease of neuronal progenitor proliferation" extend these to adult contexts.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Current frontiers focus on integrating guidance signaling with adult neurogenesis and neurovascular interactions, as evidenced by high-citation works on hippocampal progenitors and Tie2 antagonism, though no preprints or news from the last 12 months are available.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | Neurogenesis in the adult human hippocampus | 1998 | Nature Medicine | 6.3K | ✓ |
| 2 | Signal transduction by receptors with tyrosine kinase activity | 1990 | Cell | 5.5K | ✕ |
| 3 | Neurotrophins: Roles in Neuronal Development and Function | 2001 | Annual Review of Neuro... | 4.3K | ✓ |
| 4 | Cell Signaling by Receptor Tyrosine Kinases | 2000 | Cell | 3.7K | ✓ |
| 5 | Angiopoietin-2, a Natural Antagonist for Tie2 That Disrupts in... | 1997 | Science | 3.5K | ✕ |
| 6 | A PROPOSED MECHANISM OF EMOTION | 1937 | Archives of Neurology ... | 3.5K | ✕ |
| 7 | The Molecular Biology of Axon Guidance | 1996 | Science | 3.3K | ✕ |
| 8 | A Neurotrophic Model for Stress-Related Mood Disorders | 2006 | Biological Psychiatry | 3.3K | ✕ |
| 9 | The Classical Complement Cascade Mediates CNS Synapse Elimination | 2007 | Cell | 3.2K | ✓ |
| 10 | Neurogenesis in the dentate gyrus of the adult rat: age-relate... | 1996 | Journal of Neuroscience | 3.1K | ✓ |
Frequently Asked Questions
What molecules guide axon pathfinding?
Eph receptors, Semaphorins, and Netrins serve as key guidance cues that regulate growth cone dynamics through chemoattraction, chemorepulsion, contact attraction, and contact repulsion. Tessier-Lavigne and Goodman (1996) in "The Molecular Biology of Axon Guidance" describe these mechanisms directing neuronal growth cones to targets. Receptor tyrosine kinases transduce these signals to control axon navigation.
How do neurotrophins contribute to neuronal signaling?
Neurotrophins activate Trk family receptor tyrosine kinases and p75NTR to regulate neuronal development, maintenance, and function. Huang and Reichardt (2001) in "Neurotrophins: Roles in Neuronal Development and Function" detail how these receptors mediate survival and growth responses. This signaling supports processes like adult neurogenesis in the hippocampus.
What role do receptor tyrosine kinases play in axon guidance?
Receptor tyrosine kinases transduce signals from guidance molecules to direct growth cone motility and neuronal polarity. Schlessinger (2000) in "Cell Signaling by Receptor Tyrosine Kinases" explains their activation leads to intracellular cascades controlling cell behavior. Ullrich and Schlessinger (1990) in "Signal transduction by receptors with tyrosine kinase activity" further describe these pathways in neural contexts.
What is the evidence for adult neurogenesis related to neuronal signaling?
Adult human hippocampal neurogenesis occurs via progenitor proliferation influenced by signaling pathways. Eriksson et al. (1998) in "Neurogenesis in the adult human hippocampus" demonstrated this process using progenitor markers. Kuhn et al. (1996) in "Neurogenesis in the dentate gyrus of the adult rat: age-related decrease of neuronal progenitor proliferation" confirmed ongoing neuron production in rats, decreasing with age.
How does vascular patterning connect to neuronal signaling?
Angiopoietin-2 acts as an antagonist to Tie2 receptor tyrosine kinase, disrupting angiogenesis balanced by vascular endothelial growth factor. Maisonpierre et al. (1997) in "Angiopoietin-2, a Natural Antagonist for Tie2 That Disrupts in vivo Angiogenesis" showed this regulation parallels neural guidance signaling. These mechanisms overlap in neurovascular development.
What are the main mechanisms of growth cone guidance?
Growth cones navigate via contact attraction, chemoattraction, chemorepulsion, and contact repulsion mediated by molecular cues. Tessier-Lavigne and Goodman (1996) in "The Molecular Biology of Axon Guidance" outline these four mechanisms. They enable precise axon targeting during neural development.
Open Research Questions
- ? How do interactions between Semaphorins, Netrins, and Eph receptors precisely coordinate competing guidance signals at growth cones?
- ? What are the downstream effectors of receptor tyrosine kinase signaling in establishing neuronal polarity?
- ? How do neurotrophin-Trk signaling dynamics influence adult hippocampal neurogenesis rates across species?
- ? In what ways do axon guidance pathways intersect with vascular Tie2 signaling to pattern neurovascular networks?
- ? How does age-related decline in progenitor proliferation alter axon guidance cue responsiveness?
Recent Trends
The field maintains a corpus of 29,922 papers with no specified five-year growth rate.
Highly cited foundational works like Tessier-Lavigne and Goodman "The Molecular Biology of Axon Guidance" (3274 citations) and Huang and Reichardt (2001) "Neurotrophins: Roles in Neuronal Development and Function" (4324 citations) continue to anchor research on guidance molecules and receptor signaling.
1996No recent preprints or news coverage from the last six to twelve months alters these established trends.
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