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Updated: Oct 23, 2025

Measuring Cell-Edge Protrusion Dynamics during Spreading using Live-Cell Microscopy
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Pyk2 regulates cell-edge protrusion dynamics by interacting with Crk.

Nikola Lukic1, Stefanie Lapetina1, Hanna Grobe2

  • 1Laboratory for Cell Migration and Invasion, The Azrieli Faculty of Medicine, Bar-Ilan University, Safed 1311502, Israel.

Molecular Biology of the Cell
|August 25, 2021
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Summary

Proline-rich tyrosine kinase 2 (Pyk2) is crucial for fibroblast motility and cell-edge protrusion dynamics. Pyk2 interacts with Crk proteins to regulate cytoskeletal signaling, fine-tuning cell migration.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Focal adhesion kinase (FAK) regulates cell migration.
  • The role of proline-rich tyrosine kinase 2 (Pyk2) in fibroblast motility is unclear.

Purpose of the Study:

  • To investigate the role of Pyk2 in fibroblast migration and cell-edge protrusion dynamics.
  • To identify Pyk2 substrates and interactors involved in regulating fibroblast motility.

Main Methods:

  • Utilized Pyk2 knockout mouse embryonic fibroblasts (MEFs).
  • Performed bioinformatics analysis, high-throughput screening, and text mining.
  • Conducted gene knockdown and epistasis experiments.

Main Results:

  • Pyk2 deficiency significantly impairs fibroblast random and directed motility.
  • Pyk2 knockout MEFs exhibit reduced cell-edge protrusion dynamics.
  • CrkI/II identified as novel Pyk2 substrates and interactors, mediating Pyk2's effects on protrusions.

Conclusions:

  • Pyk2 is essential for regulating fibroblast motility and cell-edge protrusion dynamics.
  • Pyk2 fine-tunes cell migration by interacting with Crk proteins to modulate cytoskeletal signaling.