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The EphA8 receptor induces sustained MAP kinase activation to promote neurite outgrowth in neuronal cells

Abstract

Recent studies in our laboratory demonstrate that ligand-mediated activation of the EphA8 receptor critically regulates cell adhesion and migration. In this report, we show that the EphA8 receptor induces neurite outgrowth in NG108-15 cells in the absence of ligand stimulation. Using various deletion mutants lacking specific intracytoplasmic regions, we confirm that the tyrosine kinase domain of EphA8 is important for inducing neurite outgrowth. However, the tyrosine kinase activity of EphA8 is not crucial for neurite outgrowth induction. Treatment with various inhibitors further reveals that the mitogen-activated protein kinase (MAPK) signaling pathway is critical for neurite outgrowth induced by EphA8. Consistent with these results, EphA8 expression induced a sustained increase in the activity of MAPK, whereas ligand-mediated EphA8 activation had no further modulatory effects on MAP kinase activity. Additionally, activated MAPK relocalized from the cytoplasm to the nucleus in response to EphA8 transfection. These results collectively suggest that the EphA8 receptor is capable of inducing a sustained increase in MAPK activity, thereby promoting neurite outgrowth in neuronal cells.

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Acknowledgements

We thank Dr Henkemeyer for providing a full-length EphB2 cDNA. This work was supported by a Korea Research Foundation Grant (KRF-2002-005-C00014) and also partially by a grant (M103KV010010 03K2201 01030) from Brain Research Center of the 21st Century Frontier Research Program funded by the Ministry of Science and Technology of Republic of Korea.

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Correspondence to Soochul Park.

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Gu, C., Shim, S., Shin, J. et al. The EphA8 receptor induces sustained MAP kinase activation to promote neurite outgrowth in neuronal cells. Oncogene 24, 4243–4256 (2005). https://doi.org/10.1038/sj.onc.1208584

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