The transmembrane protein semaphorin 6A repels embryonic sympathetic axons

Xiao Mei Xu, Daniel A. Fisher, Lijuan Zhou, Fletcher White, Sheldon Ng, William D. Snidpper, Yuling Luo

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

Semaphorin 6A (Sema6A) (previously named Semaphorin VIa) is the originally described member of the vertebrate semaphorin class 6, a group of transmembrane semaphorins homologous to the insect semaphorin class 1. Although Sema-1a (previously named semaphorin I) has been implicated in axon guidance in insects, the function of Sema6A is currently unknown. We have expressed the extracellular domain of Sema6A in mammalian cells as either a monomeric or a dimeric fusion protein and tested for potential axon guidance effects on two populations of embryonic neurons in growth cone collapse and collagen matrix chemorepulsion assays. Sema6A was observed to induce growth cone collapse of sympathetic neurons with an EC50 of ~200 pM, although a 10- fold higher (EC50 of ~2 nM) concentration was necessary to induce growth cone collapse of dorsal root ganglion neurons. The activity of Sema6A is likely to depend on protein dimerization or oligomerization. Although Sema6A mRNA is expressed in complex patterns during embryonic development, it is strikingly absent from sympathetic ganglia. Sema6A is, however, expressed in areas avoided by sympathetic axons and in areas innervated by sympathetics, but before their arrival. Our results demonstrate that transmembrane semaphorins, like the secreted ones, can act as repulsive axon guidance cues. Our findings are consistent with a role for Sema6A in channeling sympathetic axons into the sympathetic chains and controlling the temporal sequence of sympathetic target innervation.

Original languageEnglish (US)
Pages (from-to)2638-2648
Number of pages11
JournalJournal of Neuroscience
Volume20
Issue number7
StatePublished - Apr 1 2000
Externally publishedYes

Fingerprint

Semaphorins
Axons
Proteins
Growth Cones
Neurons
Insects
Protein Multimerization
Sympathetic Ganglia
Spinal Ganglia

Keywords

  • Axon guidance
  • Growth cone collapse
  • Plexin
  • Repulsion
  • Semaphorin
  • Sympathetic development

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Xu, X. M., Fisher, D. A., Zhou, L., White, F., Ng, S., Snidpper, W. D., & Luo, Y. (2000). The transmembrane protein semaphorin 6A repels embryonic sympathetic axons. Journal of Neuroscience, 20(7), 2638-2648.

The transmembrane protein semaphorin 6A repels embryonic sympathetic axons. / Xu, Xiao Mei; Fisher, Daniel A.; Zhou, Lijuan; White, Fletcher; Ng, Sheldon; Snidpper, William D.; Luo, Yuling.

In: Journal of Neuroscience, Vol. 20, No. 7, 01.04.2000, p. 2638-2648.

Research output: Contribution to journalArticle

Xu, XM, Fisher, DA, Zhou, L, White, F, Ng, S, Snidpper, WD & Luo, Y 2000, 'The transmembrane protein semaphorin 6A repels embryonic sympathetic axons', Journal of Neuroscience, vol. 20, no. 7, pp. 2638-2648.
Xu XM, Fisher DA, Zhou L, White F, Ng S, Snidpper WD et al. The transmembrane protein semaphorin 6A repels embryonic sympathetic axons. Journal of Neuroscience. 2000 Apr 1;20(7):2638-2648.
Xu, Xiao Mei ; Fisher, Daniel A. ; Zhou, Lijuan ; White, Fletcher ; Ng, Sheldon ; Snidpper, William D. ; Luo, Yuling. / The transmembrane protein semaphorin 6A repels embryonic sympathetic axons. In: Journal of Neuroscience. 2000 ; Vol. 20, No. 7. pp. 2638-2648.
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