Ephrin-A5 inhibits growth of embryonic sensory neurons
Developmental Biology, ISSN: 0012-1606, Vol: 283, Issue: 2, Page: 397-408
2005
- 17Citations
- 15Captures
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Metrics Details
- Citations17
- Citation Indexes17
- 17
- CrossRef10
- Captures15
- Readers15
- 15
Article Description
EphA-ephrin signaling has recently been implicated in the establishment of motor innervation patterns, in particular in determining whether motor axons project into dorsal versus ventral nerve trunks in the limb. We investigated whether sensory axons, which grow out together with and can be guided by motor axons, are also influenced by Eph-ephrin signaling. We show that multiple EphA receptors are expressed in DRGs when limb innervation is being established, and EphA receptors are present on growth cones of both NGF-dependent (predominantly cutaneous) and NT3-dependent (predominantly proprioceptive) afferents. Both soluble and membrane-attached ephrin-A5 inhibited growth of approximately half of each population of sensory axons in vitro. On average, growth cones that collapsed in response to soluble ephrin-A5 extended more slowly than those that did not, and ephrin-A5 significantly slowed the extension of NGF-dependent growth cones that did not collapse. Finally, we show that ectopic expression of ephrin-A5 in ovo reduced arborization of cutaneous axons in skin on the limb. Together these results suggest that sensory neurons respond directly to A-class ephrins in the limb. Thus, ephrins appear to pattern sensory axon growth in two ways—both directly, and indirectly via their inhibitory effects on neighboring motor axons.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0012160605002733; http://dx.doi.org/10.1016/j.ydbio.2005.05.002; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=22144466877&origin=inward; http://www.ncbi.nlm.nih.gov/pubmed/15949793; https://linkinghub.elsevier.com/retrieve/pii/S0012160605002733; https://dx.doi.org/10.1016/j.ydbio.2005.05.002
Elsevier BV
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