Article ; Online: Tumour maintenance is mediated by eNOS.
2008 Volume 452, Issue 7187, Page(s) 646–649
Abstract: ... to initiate human tumour growth, only PI3K, through activation of protein kinase B (PKB; also known as AKT ...
Abstract | Tumour cells become addicted to the expression of initiating oncogenes like Ras, such that loss of oncogene expression in established tumours leads to tumour regression. HRas, NRas or KRas are mutated to remain in the active GTP-bound oncogenic state in many cancers. Although Ras activates several proteins to initiate human tumour growth, only PI3K, through activation of protein kinase B (PKB; also known as AKT), must remain activated by oncogenic Ras to maintain this growth. Here we show that blocking phosphorylation of the AKT substrate, endothelial nitric oxide synthase (eNOS or NOS3), inhibits tumour initiation and maintenance. Moreover, eNOS enhances the nitrosylation and activation of endogenous wild-type Ras proteins, which are required throughout tumorigenesis. We suggest that activation of the PI3K-AKT-eNOS-(wild-type) Ras pathway by oncogenic Ras in cancer cells is required to initiate and maintain tumour growth. |
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MeSH term(s) | 3T3 Cells ; Animals ; Cell Line, Transformed ; Cell Line, Tumor ; Cell Transformation, Neoplastic ; Humans ; Mice ; Neoplasms/drug therapy ; Neoplasms/enzymology ; Neoplasms/pathology ; Nitric Oxide Synthase Type III/deficiency ; Nitric Oxide Synthase Type III/genetics ; Nitric Oxide Synthase Type III/metabolism ; Phosphatidylinositol 3-Kinases/metabolism ; Phosphorylation/drug effects ; Proto-Oncogene Proteins c-akt/metabolism ; ras Proteins/metabolism |
Chemical Substances | Nitric Oxide Synthase Type III (EC 1.14.13.39) ; Phosphatidylinositol 3-Kinases (EC 2.7.1.-) ; Proto-Oncogene Proteins c-akt (EC 2.7.11.1) ; ras Proteins (EC 3.6.5.2) |
Language | English |
Publishing date | 2008-03-16 |
Publishing country | England |
Document type | Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S. |
ZDB-ID | 120714-3 |
ISSN | 1476-4687 ; 0028-0836 |
ISSN (online) | 1476-4687 |
ISSN | 0028-0836 |
DOI | 10.1038/nature06778 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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