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Protein kinase d isoforms differentially modulate cofilin-driven directed cell migration.

Heike Döppler1, Ligia I Bastea1, Sahra Borges1

  • 1Department of Cancer Biology, Mayo Clinic, Jacksonville, Florida, United States of America.

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Summary
This summary is machine-generated.

Protein kinase D (PKD) complexes regulate cell migration by controlling cofilin activity. Different PKD isoform activities balance or imbalancethese pathways, impacting cell movement.

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Area of Science:

  • Cell biology
  • Molecular signaling
  • Biochemistry

Background:

  • Protein kinase D (PKD) enzymes are crucial regulators of actin dynamics and cell migration.
  • PKDs influence cofilin-driven actin reorganization via p21-activated kinase 4 (PAK4) and slingshot 1L (SSH1L).
  • The specific roles of endogenous PKD isoforms in these pathways remain unclear.

Purpose of the Study:

  • To investigate the distinct roles of protein kinase D2 (PKD2) and protein kinase D3 (PKD3) isoforms in regulating cofilin pathways.
  • To elucidate how PKD isoform interactions affect cell migration.

Main Methods:

  • Analysis of HeLa and MDA-MB-468 cell lines expressing PKD2 and PKD3.
  • Assessment of PKD isoform complex formation and activity.
  • Evaluation of downstream signaling through PAK4 and SSH1L phosphorylation.

Main Results:

  • PKD2 and PKD3 form complexes where PKD3 is active and PKD2 is inactive under basal conditions.
  • Basal PKD3 activity promotes cell migration by activating PAK4 but not significantly inhibiting SSH1L.
  • Activated PKD2 and increased PKD3 activity inhibit SSH1L, leading to decreased cell migration.

Conclusions:

  • PKD complexes integrate cofilin regulatory pathways, modulating cell migration.
  • The activity balance of PKD isoforms dictates whether cofilin activity and cell migration are enhanced or reduced.
  • PKD isoforms differentially mediate effects on directed cell migration.