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Molecular and Cellular Biology, August 2005, p. 6889-6898, Vol. 25, No. 16
0270-7306/05/$08.00+0     doi:10.1128/MCB.25.16.6889-6898.2005

Semaphorin 4D/Plexin-B1 Induces Endothelial Cell Migration through the Activation of PYK2, Src, and the Phosphatidylinositol 3-Kinase-Akt Pathway

John R. Basile,1 Talayeh Afkhami,2 and J. Silvio Gutkind1*

Oral and Pharyngeal Cancer Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland 20892,1 School of Dentistry, University of Maryland at Baltimore, Baltimore, Maryland 212012

Received 30 December 2004/ Returned for modification 2 February 2005/ Accepted 13 May 2005

Semaphorins are cell surface and secreted proteins that provide axonal guidance in neuronal tissues and regulate cell motility in many cell types. They act by binding a family of transmembrane receptors known as plexins, which belong to the c-Met family of scatter factor receptors but lack an intrinsic tyrosine kinase domain. Interestingly, we have recently shown that Plexin-B1 is highly expressed in endothelial cells and that its activation by Semaphorin 4D elicits a potent proangiogenic response (J. R. Basile, A. Barac, T. Zhu, K. L. Guan, and J. S. Gutkind, Cancer Res. 64:5212-5224, 2004). In searches for the underlying molecular mechanism, we observed that Semaphorin 4D-stimulated endothelial cell migration requires the activation of the phosphatidylinositol 3-kinase (PI3K)-Akt pathway. Surprisingly, we found that Plexin-B1 stimulates PI3K-Akt through the activation of an intracellular tyrosine kinase cascade that involves the sequential activation of PYK2 and Src. This results in the tyrosine phosphorylation of Plexin-B1, the rapid recruitment of a multimeric signaling complex that includes PYK2, Src, and PI3K to Plexin-B1 and the activation of Akt. These findings suggest that Plexin-B1 may achieve its numerous physiological functions through the direct activation of intracellular tyrosine kinase cascades.

* Corresponding author. Mailing address: Oral and Pharyngeal Cancer Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, 30 Convent Drive, Rm. 211, Bethesda, MD 20892. Phone: (301) 496-3695. Fax: (301) 402-0823. E-mail: sg39v{at}nih.gov.

Molecular and Cellular Biology, August 2005, p. 6889-6898, Vol. 25, No. 16
0022-538X/05/$08.00+0     doi:10.1128/MCB.25.16.6889-6898.2005




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