title: GPCR Signaling Mediates Tumor Metastasis via PI3Kβ.
abstract: Inappropriate activation of PI3K signaling has been implicated strongly in human cancer. Although studies on the role of PI3K signaling in breast tumorigenesis and progression have focused most intensively on PI3Kα, a role for PI3Kβ has begun to emerge. The PI3Kβ isoform is unique among class IA PI3K enzymes in that it is activated by both receptor tyrosine kinases and G-protein-coupled receptors (GPCR). In previous work, we identified a mutation that specifically abolishes PI3Kβ binding to Gβγ (p110(526KK-DD)). Expression of this mutant in p110β-silenced breast cancer cells inhibits multiple steps of the metastatic cascade in vitro and in vivo and causes a cell autonomous defect in invadopodial matrix degradation. Our results identify a novel link between GPCRs and PI3Kβ in mediating metastasis, suggesting that disruption of this link might offer a novel therapeutic target to prevent the development of metastatic disease. Cancer Res; 76(10); 2944-53. ©2016 AACR.
authors.affiliation: Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, New York.
authors.forename: Bassem D
authors.initials: BD
authors.lastname: Khalil
authors.affiliation: Department of Biochemistry, Albert Einstein College of Medicine, Bronx, New York.
authors.forename: Christine
authors.initials: C
authors.lastname: Hsueh
authors.affiliation: Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, New York.
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Cao
authors.affiliation: Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, New York.
authors.forename: Widian F
authors.initials: WF
authors.lastname: Abi Saab
authors.affiliation: Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, New York.
authors.forename: Yarong
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, New York.
authors.forename: John S
authors.initials: JS
authors.lastname: Condeelis
authors.affiliation: Department of Biochemistry, Albert Einstein College of Medicine, Bronx, New York. jonathan.backer@einstein.yu.edu anne.bresnick@einstein.yu.edu.
authors.forename: Anne R
authors.initials: AR
authors.lastname: Bresnick
authors.affiliation: Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, New York. Department of Biochemistry, Albert Einstein College of Medicine, Bronx, New York. jonathan.backer@einstein.yu.edu anne.bresnick@einstein.yu.edu.
authors.forename: Jonathan M
authors.initials: JM
authors.lastname: Backer
mesh_terms: D000818:Animals; D017209:Apoptosis; D015153:Blotting, Western; D001943:Breast Neoplasms / Q000378:metabolism / Q000473:pathology*; D002465:Cell Movement; D049109:Cell Proliferation; D002471:Cell Transformation, Neoplastic / Q000378:metabolism / Q000473:pathology*; D058543:Class Ia Phosphatidylinositol 3-Kinase / Q000378:metabolism*; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000378:metabolism / Q000556:secondary*; D051379:Mice; D008810:Mice, Inbred C57BL; D016513:Mice, SCID; D043562:Receptors, G-Protein-Coupled / Q000378:metabolism*; D015398:Signal Transduction; D014407:Tumor Cells, Cultured; D023041:Xenograft Model Antitumor Assays
chemical_list: D043562:Receptors, G-Protein-Coupled; D058543:Class Ia Phosphatidylinositol 3-Kinase