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Research Papers
The Ben May Institute for Cancer Research and Department of Pharmacological and Physiological Sciences, The University of Chicago, Illinois 60637, USA.
Abstract
Serum and certain growth factors have the ability to inhibit programmed cell death (apoptosis) and promote survival. The mechanism by which growth factors deliver an anti-apoptotic signal and the mechanism by which this survival signal is uncoupled from mitogenesis are not clear. We studied five downstream effectors of growth factor receptors--Ras, Raf, Src, phosphoinositide 3-kinase (PI 3-kinase), and Akt (PKB)--for their abilities to block apoptosis. Activated forms of Ras, Raf, and Src, although transforming, were not sufficient to deliver a survival signal upon serum withdrawal. In contrast, inhibition of PI 3-kinase accelerated apoptosis, and an activated form of the serine/threonine kinase Akt, a downstream effector of PI 3-kinase, blocked apoptosis. The ability of Akt to promote survival was dependent on and proportional to its kinase activity. In Rat1a fibroblasts, activated Akt did not alter Bcl-2 or Bcl-X(L) expression but inhibited Ced3/ICE-like activity. Thus, the PI 3-kinase/Akt (PKB) signaling pathway transduces a survival signal that ultimately blocks Ced3/ICE-like activity. These results suggest that uncoupling of survival and mitogenesis can be explained by differing abilities of distinct mitogens to efficiently induce the PI 3-kinase/Akt signaling pathway.
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S. W. Lee, G. Dai, Z. Hu, X. Wang, J. Du, and W. E. Mitch Regulation of Muscle Protein Degradation: Coordinated Control of Apoptotic and Ubiquitin-Proteasome Systems by Phosphatidylinositol 3 Kinase J. Am. Soc. Nephrol., June 1, 2004; 15(6): 1537 - 1545. [Abstract] [Full Text] [PDF] |
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W.-K. Kim, S.-Y. Hwang, E.-S. Oh, H. Z. Piao, K.-W. Kim, and I.-O. Han TGF-{beta}1 Represses Activation and Resultant Death of Microglia via Inhibition of Phosphatidylinositol 3-Kinase Activity J. Immunol., June 1, 2004; 172(11): 7015 - 7023. [Abstract] [Full Text] [PDF] |
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S. Tanno, N. Yanagawa, A. Habiro, K. Koizumi, Y. Nakano, M. Osanai, Y. Mizukami, T. Okumura, J. R. Testa, and Y. Kohgo Serine/Threonine Kinase AKT Is Frequently Activated in Human Bile Duct Cancer and Is Associated with Increased Radioresistance Cancer Res., May 15, 2004; 64(10): 3486 - 3490. [Abstract] [Full Text] [PDF] |
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Q. Yu, C. Kovacs, F. Y. Yue, and M. A. Ostrowski The Role of the p38 Mitogen-Activated Protein Kinase, Extracellular Signal-Regulated Kinase, and Phosphoinositide-3-OH Kinase Signal Transduction Pathways in CD40 Ligand-Induced Dendritic Cell Activation and Expansion of Virus-Specific CD8+ T Cell Memory Responses J. Immunol., May 15, 2004; 172(10): 6047 - 6056. [Abstract] [Full Text] [PDF] |
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M. R. Cominetti, C. H. B. Terruggi, O. H. P. Ramos, J. W. Fox, A. Mariano-Oliveira, M. S. De Freitas, C. C. Figueiredo, V. Morandi, and H. S. Selistre-de-Araujo Alternagin-C, a Disintegrin-like Protein, Induces Vascular Endothelial Cell Growth Factor (VEGF) Expression and Endothelial Cell Proliferation in Vitro J. Biol. Chem., April 30, 2004; 279(18): 18247 - 18255. [Abstract] [Full Text] [PDF] |
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D. P. Ryan, J. P. Eder Jr., T. Puchlaski, M. V. Seiden, T. J. Lynch, C. S. Fuchs, P. C. Amrein, D. Sonnichsen, J. G. Supko, and J. W. Clark Phase I Clinical Trial of the Farnesyltransferase Inhibitor BMS-214662 Given as a 1-Hour Intravenous Infusion in Patients with Advanced Solid Tumors Clin. Cancer Res., April 1, 2004; 10(7): 2222 - 2230. [Abstract] [Full Text] [PDF] |
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Y. J. Lee, C. J. Froelich, N. Fujita, T. Tsuruo, and J. H. Kim Reconstitution of Caspase-3 Confers Low Glucose-Enhanced Tumor Necrosis Factor-Related Apoptosis-Inducing Ligand Cytotoxicity and Akt Cleavage Clin. Cancer Res., March 15, 2004; 10(6): 1894 - 1900. [Abstract] [Full Text] [PDF] |
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K. Khaleghpour, Y. Li, D. Banville, Z. Yu, and S.-H. Shen Involvement of the PI 3-kinase signaling pathway in progression of colon adenocarcinoma Carcinogenesis, February 1, 2004; 25(2): 241 - 248. [Abstract] [Full Text] [PDF] |
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S. M. Apte, D. Fan, J. J. Killion, and I. J. Fidler Targeting the Platelet-Derived Growth Factor Receptor in Antivascular Therapy for Human Ovarian Carcinoma Clin. Cancer Res., February 1, 2004; 10(3): 897 - 908. [Abstract] [Full Text] [PDF] |
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