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Loss of Focal Adhesion Kinase (FAK) Inhibits Epidermal Growth Factor Receptor-dependent Migration and Induces Aggregation of NH₂-Terminal FAK in the Nuclei of Apoptotic Glioblastoma Cells¹

Molecular Neuro-Oncology Laboratory, Department of Clinical and Biological Sciences, University of Basel, 4031 Basel, Switzerland

In glioblastoma cells, inhibition of focal adhesion kinase (FAK) by the focal adhesion targeting domain attenuated epidermal growth factor receptor (EGFR) signaling, inhibiting epidermal growth factor-dependent migration. Although the EGFR-specific antagonist PD153035 increased caspase-3 activity, this was independent of FAK activity. Instead, the increase in apoptosis upon inhibition of FAK induced the aggregation of an NH₂-terminal FAK fragment normally present in the nucleus. A recombinant NH₂-terminal FAK construct was also targeted to the nucleus and aggregated in apoptotic cells upon coexpression with the focal adhesion targeting domain. Therefore, loss of FAK from the focal adhesions inhibits EGFR signaling at the cell membrane and transmits a proapoptotic signal to an NH₂-terminal variant of FAK present in the nucleus.

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