title: Integrin-mediated protein kinase A activation at the leading edge of migrating cells.
abstract: cAMP-dependent protein kinase A (PKA) is important in processes requiring localized cell protrusion, such as cell migration and axonal path finding. Here, we used a membrane-targeted PKA biosensor to reveal activation of PKA at the leading edge of migrating cells. Previous studies show that PKA activity promotes protrusion and efficient cell migration. In live migrating cells, membrane-associated PKA activity was highest at the leading edge and required ligation of integrins such as alpha4beta1 or alpha5beta1 and an intact actin cytoskeleton. alpha4 integrins are type I PKA-specific A-kinase anchoring proteins, and we now find that type I PKA is important for localization of alpha4beta1 integrin-mediated PKA activation at the leading edge. Accumulation of 3' phosphorylated phosphoinositides [PtdIns(3,4,5)P(3)] products of phosphatidylinositol 3-kinase (PI3-kinase) is an early event in establishing the directionality of migration; however, polarized PKA activation did not require PI3-kinase activity. Conversely, inhibition of PKA blocked accumulation of a PtdIns(3,4,5)P(3)-binding protein, the AKT-pleckstrin homology (PH) domain, at the leading edge; hence, PKA is involved in maintaining cell polarity during migration. In sum, we have visualized compartment-specific PKA activation in migrating cells and used it to reveal that adhesion-mediated localized activation of PKA is an early step in directional cell migration.
authors.affiliation: Department of Medicine, University of California San Diego, La Jolla, CA 92093-0726, USA.
authors.forename: Chinten J
authors.initials: CJ
authors.lastname: Lim
authors.forename: Kristin H
authors.initials: KH
authors.lastname: Kain
authors.forename: Eugene
authors.initials: E
authors.lastname: Tkachenko
authors.forename: Lawrence E
authors.initials: LE
authors.lastname: Goldfinger
authors.forename: Edgar
authors.initials: E
authors.lastname: Gutierrez
authors.forename: Michael D
authors.initials: MD
authors.lastname: Allen
authors.forename: Alex
authors.initials: A
authors.lastname: Groisman
authors.forename: Jin
authors.initials: J
authors.lastname: Zhang
authors.forename: Mark H
authors.initials: MH
authors.lastname: Ginsberg
mesh_terms: D000199:Actins / Q000378:metabolism; D000818:Animals; D015374:Biosensing Techniques; D016466:CHO Cells; D002465:Cell Movement / Q000187:drug effects; D016764:Cell Polarity / Q000187:drug effects; D006224:Cricetinae; D003412:Cricetulus; D000242:Cyclic AMP / Q000494:pharmacology; D017868:Cyclic AMP-Dependent Protein Kinases / Q000378:metabolism*; D004789:Enzyme Activation / Q000187:drug effects; D039041:Integrin alpha4beta1 / Q000378:metabolism*; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism; D011554:Pseudopodia / Q000187:drug effects / Q000201:enzymology*
chemical_list: D000199:Actins; D039041:Integrin alpha4beta1; D000242:Cyclic AMP; D019869:Phosphatidylinositol 3-Kinases; D017868:Cyclic AMP-Dependent Protein Kinases
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