Novel mechanism for gonadotropin-releasing hormone neuronal migration involving Gas6/ark signaling to p38 mitogen-activated protein kinase

M. P. Allen, D. A. Linseman, Hiroshi Udo, M. Xu, J. B. Schaack, B. Varnum, E. R. Kandel, K. A. Heidenreich, M. E. Wierman

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Abstract

Gonadotropin-releasing hormone (GnRH) is the central regulator of the reproductive axis. Normal sexual maturation depends on the migration of GnRH neurons from the olfactory placode to the hypothalamus during development. Previously, we showed restricted expression of the membrane receptor adhesion-related kinase (Ark) in immortalized cell lines derived from migratory but not postmigratory GnRH neurons. In addition, Ark and GnRH transcripts were detected along the GnRH neuron migratory route in the E13 mouse cribriform plate. In the present study, we examined the role of Ark and its ligand, Gas6 (encoded by growth arrest-specific gene 6), in GnRH neuron migration. Gas6 stimulated lamellipodial extension, membrane ruffling, and chemotaxis of immortalized NLT GnRH neuronal cells via the Ark receptor. Gas6/Ark signaling promoted activation of the Rho family GTPase Rac, and adenoviral-mediated expression of dominant negative N17Rac abolished Gas6/Ark-induced actin cytoskeletal reorganization and migration of GnRH neuronal cells. In addition, p38 MAPK was activated downstream of Ark and Rac, and inhibition of p38 MAPK with either SB203580 or adenoviral dominant negative p38α also blocked Gas6/Ark-mediated migration. Finally, downstream of Rac and p38 mitogen-activated protein kinase (MAPK), Gas6/Ark signaling promoted activation of MAPK-activated protein kinase 2 and induced phosphorylation of HSP25, a known regulator of cortical actin remodeling. The data are the first to demonstrate a migratory signaling pathway downstream of Ark/Axl family receptors and suggest a previously unidentified role for p38 MAPK in neuronal migration. Furthermore, these studies support a potential role for Ark in the regulation of GnRH neuronal migration.

Original languageEnglish
Pages (from-to)599-613
Number of pages15
JournalMolecular and Cellular Biology
Volume22
Issue number2
DOIs
Publication statusPublished - Jan 12 2002

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p38 Mitogen-Activated Protein Kinases
Gonadotropin-Releasing Hormone
Phosphotransferases
Growth
Genes
Neurons
Ethmoid Bone
Sexual Maturation
rho GTP-Binding Proteins
Membranes
Chemotaxis
Mitogen-Activated Protein Kinases
Cell Adhesion
Protein Kinases
Hypothalamus
Actins
Phosphorylation
Ligands
Cell Line

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Cell Biology

Cite this

Novel mechanism for gonadotropin-releasing hormone neuronal migration involving Gas6/ark signaling to p38 mitogen-activated protein kinase. / Allen, M. P.; Linseman, D. A.; Udo, Hiroshi; Xu, M.; Schaack, J. B.; Varnum, B.; Kandel, E. R.; Heidenreich, K. A.; Wierman, M. E.

In: Molecular and Cellular Biology, Vol. 22, No. 2, 12.01.2002, p. 599-613.

Research output: Contribution to journalArticle

Allen, MP, Linseman, DA, Udo, H, Xu, M, Schaack, JB, Varnum, B, Kandel, ER, Heidenreich, KA & Wierman, ME 2002, 'Novel mechanism for gonadotropin-releasing hormone neuronal migration involving Gas6/ark signaling to p38 mitogen-activated protein kinase', Molecular and Cellular Biology, vol. 22, no. 2, pp. 599-613. https://doi.org/10.1128/MCB.22.2.599-613.2002
Allen, M. P. ; Linseman, D. A. ; Udo, Hiroshi ; Xu, M. ; Schaack, J. B. ; Varnum, B. ; Kandel, E. R. ; Heidenreich, K. A. ; Wierman, M. E. / Novel mechanism for gonadotropin-releasing hormone neuronal migration involving Gas6/ark signaling to p38 mitogen-activated protein kinase. In: Molecular and Cellular Biology. 2002 ; Vol. 22, No. 2. pp. 599-613.
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AU - Linseman, D. A.

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AU - Xu, M.

AU - Schaack, J. B.

AU - Varnum, B.

AU - Kandel, E. R.

AU - Heidenreich, K. A.

AU - Wierman, M. E.

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