Title |
A Novel Interplay between Rap1 and PKA Regulates Induction of Angiogenesis in Prostate Cancer
|
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Published in |
PLOS ONE, November 2012
|
DOI | 10.1371/journal.pone.0049893 |
Pubmed ID | |
Authors |
Jyotsana Menon, Robert C. Doebele, Suzana Gomes, Elena Bevilacqua, Katie M. Reindl, Marsha Rich Rosner |
Abstract |
Angiogenesis inhibition is an important therapeutic strategy for advanced stage prostate cancer. Previous work from our laboratory showed that sustained stimulation of Rap1 by 8-pCPT-2'-O-Me-cAMP (8CPT) via activation of Epac, a Rap1 GEF, or by expression of a constitutively active Rap1 mutant (cRap1) suppresses endothelial cell chemotaxis and subsequent angiogenesis. When we tested this model in the context of a prostate tumor xenograft, we found that 8CPT had no significant effect on prostate tumor growth alone. However, in cells harboring cRap1, 8CPT dramatically inhibited not only prostate tumor growth but also VEGF expression and angiogenesis within the tumor microenvironment. Subsequent analysis of the mechanism revealed that, in prostate tumor epithelial cells, 8CPT acted via stimulation of PKA rather than Epac/Rap1. PKA antagonizes Rap1 and hypoxic induction of 1α protein expression, VEGF production and, ultimately, angiogenesis. Together these findings provide evidence for a novel interplay between Rap1, Epac, and PKA that regulates tumor-stromal induction of angiogenesis. |
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Unknown | 1 | 100% |
Demographic breakdown
Type | Count | As % |
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Members of the public | 1 | 100% |
Mendeley readers
Geographical breakdown
Country | Count | As % |
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Italy | 2 | 8% |
Belgium | 1 | 4% |
Unknown | 21 | 88% |
Demographic breakdown
Readers by professional status | Count | As % |
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Student > Ph. D. Student | 4 | 17% |
Researcher | 4 | 17% |
Student > Bachelor | 3 | 13% |
Professor > Associate Professor | 2 | 8% |
Student > Master | 2 | 8% |
Other | 5 | 21% |
Unknown | 4 | 17% |
Readers by discipline | Count | As % |
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Biochemistry, Genetics and Molecular Biology | 8 | 33% |
Agricultural and Biological Sciences | 6 | 25% |
Pharmacology, Toxicology and Pharmaceutical Science | 1 | 4% |
Unspecified | 1 | 4% |
Computer Science | 1 | 4% |
Other | 1 | 4% |
Unknown | 6 | 25% |