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Abstract
Autocrine VEGF signaling is critical for sustaining prostate and other cancer stem cells (CSCs), and it is a potential therapeutic target, but we observed that CSCs isolated from prostate tumors are resistant to anti-VEGF (bevacizumab) and anti-VEGFR (sunitinib) therapy. Intriguingly, resistance is mediated by VEGF/neuropilin signaling, which is not inhibited by bevacizumab and sunitinib, and it involves the induction of P-Rex1, a Rac GEF, and consequent Rac1-mediated ERK activation. This induction of P-Rex1 is dependent on Myc. CSCs isolated from the PTENpc−/− transgenic model of prostate cancer exhibit Rac1-dependent resistance to bevacizumab. Rac1 inhibition or P-Rex1 downregulation increases the sensitivity of prostate tumors to bevacizumab. These data reveal that prostate tumors harbor cells with stem cell properties that are resistant to inhibitors of VEGF/VEGFR signaling. Combining the use of available VEGF/VEGFR-targeted therapies with P-Rex1 or Rac1 inhibition should improve the efficacy of these therapies significantly.
Document Type
Article
Publication Date
3-8-2016
Digital Object Identifier (DOI)
https://doi.org/10.1016/j.celrep.2016.02.016
Funding Information
Work in the authors’ laboratory is supported by NIH grants CA168464 and CA159856 and by US Department of Defense prostate cancer grant W81XWH-12-1-0308 (A.M.M.), RO1GM094155 (C.W.V.K.), and Cancer Core grant CA034196 to the Jackson Laboratory (to L.D.S.).
Repository Citation
Goel, Hira Lal; Pursell, Bryan; Shultz, Leonard D.; Greiner, Dale L.; Brekken, Rolf A; Vander Kooi, Craig W.; and Mercurio, Arthur M., "P-Rex1 Promotes Resistance to VEGF/VEGFR-Targeted Therapy in Prostate Cancer" (2016). Molecular and Cellular Biochemistry Faculty Publications. 90.
https://uknowledge.uky.edu/biochem_facpub/90
Document S1. Figures S1-S7
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Biochemistry, Biophysics, and Structural Biology Commons, Cancer Biology Commons, Cell Biology Commons, Oncology Commons
Notes/Citation Information
Published in Cell Reports, v. 14, issue 9, p. 2193-2208.
© 2016 The Authors.
This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).