PDE4-regulated cAMP degradation controls the assembly of integrin-dependent actin adhesion structures and REF52 cell migration

Yvonne M Fleming, Margaret C Frame, Miles D Houslay

Research output: Contribution to journalArticlepeer-review

Abstract

Plating of REF52 cells onto extracellular matrix components leads to the formation of integrin-dependent actin adhesion microspikes. We show that the formation of these structures is sensitive to chemical agents that regulate cAMP levels, such as forskolin and IBMX. In particular, by using the specific inhibitor rolipram, we identify the PDE4 family of cAMP-specific phosphodiesterases as critical regulators of this process. The effect of PDE4 on microspike formation is mediated by actions exerted through the activation of PKA - rather than through the alternative cAMP effector, Epac. We provide evidence that peripheral microspikes are RhoA-, ROCK- and myosin-dependent, and that this pathway is suppressed by PDE4 inhibition. In addition, PDE4 inhibition impairs cell locomotion that requires dynamic protrusion and retraction of peripheral spike structures. Our data demonstrate that PDE4 activity is a key modulator of integrin-induced actin assembly at the cell periphery which, in turn, controls cell migration.
Original languageEnglish
Pages (from-to)2377-88
Number of pages12
JournalJournal of Cell Science
Volume117
Issue numberPt 11
DOIs
Publication statusPublished - 1 May 2004

Keywords

  • 1-Methyl-3-isobutylxanthine
  • 3',5'-Cyclic-AMP Phosphodiesterases
  • Actins
  • Animals
  • Cell Adhesion
  • Cell Line
  • Cell Movement
  • Colforsin
  • Cyclic AMP
  • Cyclic AMP-Dependent Protein Kinases
  • Cyclic Nucleotide Phosphodiesterases, Type 4
  • Embryo, Mammalian
  • Enzyme Activation
  • Fibroblasts
  • Integrins
  • Intracellular Signaling Peptides and Proteins
  • Laminin
  • Myosin-Light-Chain Kinase
  • Neuropeptides
  • Protein-Serine-Threonine Kinases
  • Pseudopodia
  • Rats
  • Rolipram
  • cdc42 GTP-Binding Protein
  • rac GTP-Binding Proteins
  • rac1 GTP-Binding Protein
  • rho-Associated Kinases
  • rhoA GTP-Binding Protein

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