RSK/GSK3-mediated phosphorylation of FilGAP regulates chemotactic cancer invasion
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View abstract on PubMed
Summary
This summary is machine-generated.Epidermal growth factor (EGF) signaling phosphorylates FilGAP, a protein that regulates cell migration. This phosphorylation controls cell adhesion and protrusion formation, impacting tumor cell movement toward chemical signals.
Area Of Science
- Cell biology
- Molecular signaling
- Cancer research
Background
- Cell migration is vital for development and disease, including cancer metastasis.
- Rho family GTPase Rac regulates cell migration by promoting actin polymerization and lamellipodia formation.
- FilGAP (ARHGAP24), a Rac-specific GTPase-activating protein, inhibits lamellipodia and controls tumor cell migration.
Purpose Of The Study
- To investigate the role of FilGAP phosphorylation in regulating cell migration.
- To identify the kinases and phosphorylation sites involved in FilGAP regulation by epidermal growth factor (EGF).
- To elucidate how FilGAP phosphorylation affects its interaction with actin and its function in cell adhesion and protrusion formation.
Main Methods
- Utilized biochemical assays to identify kinases (RSK, GSK3) and phosphorylation sites (Ser625, Ser621) on FilGAP.
- Investigated FilGAP's interaction with actin filaments using microscopy and biochemical techniques.
- Employed site-directed mutagenesis to create nonphosphorylatable FilGAP mutants for functional studies.
- Assessed the impact of FilGAP phosphorylation on cell migration speed and persistence in response to EGF gradients.
Main Results
- FilGAP is phosphorylated by RSK and GSK3 downstream of EGF stimulation.
- Phosphorylation causes FilGAP to dissociate from actin filaments, inhibiting its lamellipodia suppression activity.
- A novel actin-localization domain in FilGAP was identified, crucial for stabilizing cell adhesion.
- Expression of a nonphosphorylatable FilGAP mutant reduced cell migration speed and persistence towards an EGF gradient.
Conclusions
- FilGAP phosphorylation, triggered by EGF signaling, is a critical regulator of chemotactic tumor cell migration.
- Phosphorylation modulates FilGAP's function by affecting its actin binding, thereby influencing cell-matrix adhesion and protrusion dynamics.
- Targeting FilGAP phosphorylation presents a potential strategy for controlling tumor cell migration.
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