Extracellular signal-regulated kinase promotes Rho-dependent focal adhesion formation by suppressing p190A RhoGAP

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Updated: Jun 13, 2026

Affinity Precipitation of Active Rho-GEFs Using a GST-tagged Mutant Rho Protein (GST-RhoA(G17A)) from Epithelial Cell Lysates
11:28

Affinity Precipitation of Active Rho-GEFs Using a GST-tagged Mutant Rho Protein (GST-RhoA(G17A)) from Epithelial Cell Lysates

Published on: March 31, 2012

Ashok K Pullikuth1, Andrew D Catling

  • 1Louisiana State University Health Sciences Center, 1901 Perdido Street, New Orleans, LA 70112, USA. apulli@lsuhsc.edu

Molecular and Cellular Biology
|May 5, 2010
PubMed

Insights

Extracellular signal-regulated kinase (ERK) activity is essential for cell migration by regulating focal adhesions. ERK signaling promotes Rho-GTP loading and focal adhesion maturation, impacting cell motility and cancer metastasis.

Area of Science:

  • Cell biology
  • Molecular biology
  • Biochemistry

Background:

  • Cell migration is vital for development and cancer metastasis.
  • Focal adhesions and actin cytoskeleton remodeling are key to cell motility.
  • Rho family proteins and MAPK (MEK-ERK) pathways regulate these processes, but their integration is unclear.

Purpose of the Study:

  • To investigate the integration mechanisms of Rho and MAPK signaling in cell spreading and motility.
  • To elucidate the role of ERK in regulating focal adhesion dynamics and Rho activity.

Main Methods:

  • Utilized cell culture models to study cell spreading and migration.
  • Employed biochemical assays to measure Rho-GTP loading and Rho-kinase activity.
  • Investigated the effects of ERK signaling on focal adhesion formation and maturation.
  • Identified and characterized p190A RhoGAP as a target of ERK signaling.

Main Results:

  • ERK activity is required for fibronectin-stimulated Rho-GTP loading and Rho-kinase function.
  • ERK signaling is crucial for the maturation of focal adhesions during cell spreading.
  • p190A RhoGAP was identified as a key target of ERK signaling in adhesion assembly.
  • ERK phosphorylation of p190A RhoGAP influences its localization and activity.

Conclusions:

  • ERK signaling plays a novel role in focal adhesion assembly, beyond its known role in disassembly.
  • ERK-mediated regulation of p190A RhoGAP is a critical mechanism integrating MAPK and Rho pathways for cell adhesion.
  • Understanding this crosstalk is crucial for comprehending cell motility and cancer metastasis.

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