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pubmed-article:11641777pubmed:abstractTextWhile both nitric oxide synthase-2 (NOS-2) and low molecular weight GTPases, such as Ras and Rho, have been implicated in malignant transformation, the cross talk between these important proteins is ill understood. In this study we examined the ability of H-Ras, RhoA, RhoB and Rac1 to modulate cytokine-induced NOS2. In the normal human liver AKN-1 cell line and in the human non-small cell lung carcinoma cell line, A-549, the ability of the cytokines (INF-gamma, IL-1beta and TNF-alpha) to activate NOS-2 was blocked by activated L61-H-Ras whereas dominant negative N17-H-Ras enhanced NOS-2 activation. Consistent with this dominant negative Erk2 as well as a MEK inhibitor also enhanced cytokine activation of NOS-2. Furthermore, activated L63-RhoA blocked whereas activated V14-RhoB enhanced cytokine NOS-2 activation. Activated I115-Racl did not affect NOS-2 activation. These results demonstrate that the Ras/Erk and the Ras/RhoA pathways negatively regulate whereas RhoB enhances cytokine-induced NOS-2. This is the first demonstration that genes that promote malignant transformation such as Ras and RhoA inhibit, whereas genes with tumor suppressor activity such as RhoB enhance NOS2 induction.lld:pubmed
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pubmed-article:11641777pubmed:articleTitleRas and RhoA suppress whereas RhoB enhances cytokine-induced transcription of nitric oxide synthase-2 in human normal liver AKN-1 cells and lung cancer A-549 cells.lld:pubmed
pubmed-article:11641777pubmed:affiliationDrug Discovery Program, H. Lee Moffitt Cancer Center & Research Institute, University of South Florida, 12902 Magnolia Drive, Tampa, FL 33612, USA.lld:pubmed
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pubmed-article:11641777pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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