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The Rac activator STEF (Tiam2) regulates cell migration by microtubule-mediated focal adhesion disassembly

Claire Rooney1, Gavin White, Alicja Nazgiewicz

  • 1Cell Signalling Group, Cancer Research UK Paterson Institute for Cancer Research, The University of Manchester, Manchester M20 4BX, UK.

EMBO Reports
|March 13, 2010
PubMed

Insights

Microtubules (MTs) mediate focal adhesion (FA) disassembly for cell migration. The Rac guanine nucleotide exchange factor (GEF) STEF is crucial for MT-mediated FA disassembly and cell migration speed.

Area of Science:

  • Cell biology
  • Molecular mechanisms of cell migration
  • Cytoskeleton dynamics

Background:

  • Focal adhesion (FA) disassembly is essential for efficient cell migration.
  • Microtubules (MTs) play a critical role in mediating FA disassembly.
  • The activation of Rho-like GTPase Rac is linked to FA disassembly during MT regrowth.

Purpose of the Study:

  • To identify the specific guanine nucleotide exchange factor (GEF) responsible for Rac activation during MT regrowth.
  • To elucidate the role of STEF in MT-mediated FA targeting and disassembly.
  • To investigate the impact of STEF on cell migration speed.

Main Methods:

  • Investigating Rac activation during MT regrowth.
  • Utilizing STEF knockdown to assess its necessity in FA targeting by MTs.
  • Quantifying FA disassembly rates and cell migration speeds in STEF-knockdown cells.

Main Results:

  • STEF is identified as the GEF responsible for Rac activation during MT regrowth.
  • STEF is essential for MTs to repeatedly target FAs.
  • STEF knockdown leads to reduced FA disassembly rates, enlarged FAs, and decreased cell migration speed.

Conclusions:

  • STEF plays a novel role in FA disassembly through MT-mediated mechanisms.
  • STEF is a key regulator of cell migration by controlling FA dynamics.
  • Targeting STEF could offer a strategy to modulate cell migration.

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