title: Differential inhibitor of Gbetagamma signaling to AKT and ERK derived from phosducin-like protein: effect on sphingosine 1-phosphate-induced endothelial cell migration and in vitro angiogenesis.
abstract: Differential inhibitors of Gbetagamma-effector regions are required to dissect the biological contribution of specific Gbetagamma-initiated signaling pathways. Here, we characterize PhLP-M1-G149, a Gbetagamma-interacting construct derived from phosducin-like protein 1 (PhLP) as a differential inhibitor of Gbetagamma, which, in endothelial cells, prevented sphingosine 1-phosphate-induced phosphorylation of AKT, glycogen synthase kinase 3beta, cell migration, and tubulogenesis, while having no effect on ERK phosphorylation or hepatocyte growth factor-dependent responses. This construct attenuated the recruitment of phosphoinositide 3-kinase gamma (PI3Kgamma) to the plasma membrane and the signaling to AKT in response to Gbetagamma overexpression. In coimmunoprecipitation experiments, PhLP-M1-G149 interfered with the interaction between PI3Kgamma and Gbetagamma. Other PhLP-derived constructs interacted with Gbetagamma but were not effective inhibitors of Gbetagamma signaling to AKT or ERK. Our results indicate that PhLP-M1-G149 is a suitable tool to differentially modulate the Gbetagamma-initiated pathway linking this heterodimer to AKT, endothelial cell migration, and in vitro angiogenesis. It can be also useful to further characterize the molecular determinants of the Gbetagamma-PI3Kgamma interaction.
authors.affiliation: Department of Pharmacology, Center for Research and Advanced Studies of the National Polytechnic Institute (CINVESTAV-IPN), Apartado Postal 14-740, DF 07000 Mexico.
authors.forename: María Luisa
authors.initials: ML
authors.lastname: Guzmán-Hernández
authors.forename: Aleida
authors.initials: A
authors.lastname: Vázquez-Macías
authors.forename: Jorge
authors.initials: J
authors.lastname: Carretero-Ortega
authors.forename: Ricardo
authors.initials: R
authors.lastname: Hernández-García
authors.forename: Alejandro
authors.initials: A
authors.lastname: García-Regalado
authors.forename: Ivette
authors.initials: I
authors.lastname: Hernández-Negrete
authors.forename: Guadalupe
authors.initials: G
authors.lastname: Reyes-Cruz
authors.forename: J Silvio
authors.initials: JS
authors.lastname: Gutkind
authors.forename: José
authors.initials: J
authors.lastname: Vázquez-Prado
mesh_terms: D000818:Animals; D001011:Aorta / Q000166:cytology; D002352:Carrier Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D002460:Cell Line; D002465:Cell Movement / Q000502:physiology; D019281:Dimerization; D042783:Endothelial Cells / Q000166:cytology* / Q000378:metabolism*; D048049:Extracellular Signal-Regulated MAP Kinases / Q000378:metabolism*; D044387:GTP-Binding Protein beta Subunits / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D044388:GTP-Binding Protein gamma Subunits / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D049452:Green Fluorescent Proteins / Q000235:genetics; D006801:Humans; D066298:In Vitro Techniques; D007668:Kidney / Q000166:cytology; D008246:Lysophospholipids / Q000378:metabolism / Q000494:pharmacology; D020935:MAP Kinase Signaling System / Q000187:drug effects / Q000502:physiology; D016297:Mutagenesis, Site-Directed; D018919:Neovascularization, Physiologic / Q000502:physiology; D009419:Nerve Tissue Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D037342:Pertussis Toxin / Q000494:pharmacology; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism; D010766:Phosphorylation / Q000502:physiology; D017434:Protein Structure, Tertiary; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism*; D013110:Sphingosine / Q000031:analogs & derivatives / Q000378:metabolism / Q000494:pharmacology; D013552:Swine; D014162:Transfection
chemical_list: D002352:Carrier Proteins; C118981:G-protein Beta gamma; D044387:GTP-Binding Protein beta Subunits; D044388:GTP-Binding Protein gamma Subunits; D008246:Lysophospholipids; D009419:Nerve Tissue Proteins; C098789:PDCL protein, human; D049452:Green Fluorescent Proteins; C060506:sphingosine 1-phosphate; D037342:Pertussis Toxin; D019869:Phosphatidylinositol 3-Kinases; D051057:Proto-Oncogene Proteins c-akt; D048049:Extracellular Signal-Regulated MAP Kinases; D013110:Sphingosine