GPCR Signaling Mediates Tumor Metastasis via PI3Kβ
- 12 May 2016
- journal article
- Published by American Association for Cancer Research (AACR) in Cancer Research
- Vol. 76 (10), 2944-2953
- https://doi.org/10.1158/0008-5472.can-15-1675
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 (p110526KK-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.Other Versions
Funding Information
- NIH (1P01 CA100324)
- NIH (GM112524)
- Intravital Imaging, Cell Isolation and Fate Mapping Core of the Program Project in Motility and Invasion the Histotechnology and Comparative Pathology Core of the Einstein Cancer Center (1 P01 CA100324, P30-CA013330)
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