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Originally published In Press as doi:10.1074/jbc.M204733200 on June 6, 2002

J. Biol. Chem., Vol. 277, Issue 33, 29936-29944, August 16, 2002
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Hsp90 Regulates a von Hippel Lindau-independent Hypoxia-inducible Factor-1alpha -degradative Pathway*

Jennifer S. Isaacs, Yun-Jin Jung, Edward G. Mimnaugh, Alfredo Martinez, Frank Cuttitta, and Leonard M. NeckersDagger

From the Cell and Cancer Biology Branch, Center for Cancer Research, NCI, National Institutes of Health, Rockville, Maryland 20850

HIF-1alpha is a normally labile proangiogenic transcription factor that is stabilized and activated in hypoxia. Although the von Hippel Lindau (VHL) gene product, the ubiquitin ligase responsible for regulating HIF-1alpha protein levels, efficiently targets HIF-1alpha for rapid proteasome-dependent degradation under normoxia, HIF-1alpha is resistant to the destabilizing effects of VHL under hypoxia. HIF-1alpha also associates with the molecular chaperone Hsp90. To examine the role of Hsp90 in HIF-1alpha function, we used renal carcinoma cell (RCC) lines that lack functional VHL and express stable HIF-1alpha protein under normoxia. Geldanamycin (GA), an Hsp90 antagonist, promoted efficient ubiquitination and proteasome-mediated degradation of HIF-1alpha in RCC in both normoxia and hypoxia. Furthermore, HIF-1alpha point mutations that block VHL association did not protect HIF-1alpha from GA-induced destabilization. Hsp90 antagonists also inhibited HIF-1alpha transcriptional activity and dramatically reduced both hypoxia-induced accumulation of VEGF mRNA and hypoxia-dependent angiogenic activity. These findings demonstrate that disruption of Hsp90 function 1) promotes HIF-1alpha degradation via a novel, oxygen-independent E3 ubiquitin ligase and 2) diminishes HIF-1alpha transcriptional activity. Existence of an Hsp90-dependent pathway for elimination of HIF-1alpha predicts that Hsp90 antagonists may be hypoxic cell sensitizers and possess antiangiogenic activity in vivo, thus extending the utility of these drugs as therapeutic anticancer agents.


* The costs of publication of this article were defrayed in part by the payment of page charges. The article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

Dagger To whom correspondence should be addressed: Cell and Cancer Biology Branch, Center for Cancer Research, NCI, National Institutes of Health, 9610 Medical Center Dr., Ste. 300, Rockville, MD 20850. Tel.: 301-402-3128 (ext. 318); Fax: 301-402-4422; E-mail: len@helix.nih.gov.


Copyright © 2002 by The American Society for Biochemistry and Molecular Biology, Inc.
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J. Zhou, T. Schmid, R. Frank, and B. Brune
PI3K/Akt Is Required for Heat Shock Proteins to Protect Hypoxia-inducible Factor 1{alpha} from pVHL-independent Degradation
J. Biol. Chem., April 2, 2004; 279(14): 13506 - 13513.
[Abstract] [Full Text] [PDF]


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Am. J. Physiol. Regul. Integr. Comp. Physiol.Home page
G. Hopfl, O. Ogunshola, and M. Gassmann
HIFs and tumors--causes and consequences
Am J Physiol Regulatory Integrative Comp Physiol, April 1, 2004; 286(4): R608 - R623.
[Abstract] [Full Text] [PDF]


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Cardiovasc ResHome page
N. C Chi and J. S Karliner
Molecular determinants of responses to myocardial ischemia/reperfusion injury: focus on hypoxia-inducible and heat shock factors
Cardiovasc Res, February 15, 2004; 61(3): 437 - 447.
[Abstract] [Full Text] [PDF]


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Cancer Res.Home page
K. S. Bisht, C. M. Bradbury, D. Mattson, A. Kaushal, A. Sowers, S. Markovina, K. L. Ortiz, L. K. Sieck, J. S. Isaacs, M. W. Brechbiel, et al.
Geldanamycin and 17-Allylamino-17-demethoxygeldanamycin Potentiate the in Vitro and in Vivo Radiation Response of Cervical Tumor Cells via the Heat Shock Protein 90-Mediated Intracellular Signaling and Cytotoxicity
Cancer Res., December 15, 2003; 63(24): 8984 - 8995.
[Abstract] [Full Text] [PDF]


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Am. J. Pathol.Home page
H.-T. Yuan, X.-Z. Li, J. E. Pitera, D. A. Long, and A. S. Woolf
Peritubular Capillary Loss after Mouse Acute Nephrotoxicity Correlates with Down-Regulation of Vascular Endothelial Growth Factor-A and Hypoxia-Inducible Factor-1{alpha}
Am. J. Pathol., December 1, 2003; 163(6): 2289 - 2301.
[Abstract] [Full Text]


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Genes Dev.Home page
R. K. Bruick
Oxygen sensing in the hypoxic response pathway: regulation of the hypoxia-inducible transcription factor
Genes & Dev., November 1, 2003; 17(21): 2614 - 2623.
[Full Text] [PDF]


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Proc. Natl. Acad. Sci. USAHome page
P. de Candia, D. B. Solit, D. Giri, E. Brogi, P. M. Siegel, A. B. Olshen, W. J. Muller, N. Rosen, and R. Benezra
Angiogenesis impairment in Id-deficient mice cooperates with an Hsp90 inhibitor to completely suppress HER2/neu-dependent breast tumors
PNAS, October 14, 2003; 100(21): 12337 - 12342.
[Abstract] [Full Text] [PDF]


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Ann OncolHome page
M. P. Goetz, D. O. Toft, M. M. Ames, and C. Erlichman
The Hsp90 chaperone complex as a novel target for cancer therapy
Ann. Onc., August 1, 2003; 14(8): 1169 - 1176.
[Abstract] [Full Text] [PDF]


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Clin. Cancer Res.Home page
S. T. Palayoor, P. J. Tofilon, and C. N. Coleman
Ibuprofen-mediated Reduction of Hypoxia-inducible Factors HIF-1{alpha} and HIF-2{alpha} in Prostate Cancer Cells
Clin. Cancer Res., August 1, 2003; 9(8): 3150 - 3157.
[Abstract] [Full Text] [PDF]


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Mol. Biol. CellHome page
E. Metzen, J. Zhou, W. Jelkmann, J. Fandrey, and B. Brune
Nitric Oxide Impairs Normoxic Degradation of HIF-1{alpha} by Inhibition of Prolyl Hydroxylases
Mol. Biol. Cell, August 1, 2003; 14(8): 3470 - 3481.
[Abstract] [Full Text] [PDF]


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Mol. Cell. Biol.Home page
S.-k. Park, A. M. Dadak, V. H. Haase, L. Fontana, A. J. Giaccia, and R. S. Johnson
Hypoxia-Induced Gene Expression Occurs Solely through the Action of Hypoxia-Inducible Factor 1{alpha} (HIF-1{alpha}): Role of Cytoplasmic Trapping of HIF-2{alpha}
Mol. Cell. Biol., July 15, 2003; 23(14): 4959 - 4971.
[Abstract] [Full Text] [PDF]


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J. Biol. Chem.Home page
L. E. Huang and H. F. Bunn
Hypoxia-inducible Factor and Its Biomedical Relevance
J. Biol. Chem., May 23, 2003; 278(22): 19575 - 19578.
[Full Text] [PDF]


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J. Cell Sci.Home page
E. Metzen, U. Berchner-Pfannschmidt, P. Stengel, J. H. Marxsen, I. Stolze, M. Klinger, W. Q. Huang, C. Wotzlaw, T. Hellwig-Burgel, W. Jelkmann, et al.
Intracellular localisation of human HIF-1{alpha} hydroxylases: implications for oxygen sensing
J. Cell Sci., April 1, 2003; 116(7): 1319 - 1326.
[Abstract] [Full Text] [PDF]


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Molecular Cancer TherapeuticsHome page
S. J. Welsh, R. R. Williams, A. Birmingham, D. J. Newman, D. L. Kirkpatrick, and G. Powis
The Thioredoxin Redox Inhibitors 1-Methylpropyl 2-Imidazolyl Disulfide and Pleurotin Inhibit Hypoxia-induced Factor 1{alpha} and Vascular Endothelial Growth Factor Formation
Mol. Cancer Ther., March 1, 2003; 2(3): 235 - 243.
[Abstract] [Full Text] [PDF]


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J. Biol. Chem.Home page
Y.-J. Jung, J. S. Isaacs, S. Lee, J. Trepel, and L. Neckers
Microtubule Disruption Utilizes an NFkappa B-dependent Pathway to Stabilize HIF-1alpha Protein
J. Biol. Chem., February 21, 2003; 278(9): 7445 - 7452.
[Abstract] [Full Text] [PDF]


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J. Biol. Chem.Home page
L. E. Huang, E. A. Pete, M. Schau, J. Milligan, and J. Gu
Leu-574 of HIF-1alpha Is Essential for the von Hippel-Lindau (VHL)-mediated Degradation Pathway
J. Biol. Chem., October 25, 2002; 277(44): 41750 - 41755.
[Abstract] [Full Text] [PDF]


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J. Biol. Chem.Home page
D. A. Chan, P. D. Sutphin, N. C. Denko, and A. J. Giaccia
Role of Prolyl Hydroxylation in Oncogenically Stabilized Hypoxia-inducible Factor-1alpha
J. Biol. Chem., October 11, 2002; 277(42): 40112 - 40117.
[Abstract] [Full Text] [PDF]


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Proc. Natl. Acad. Sci. USAHome page
W. Xu, M. Marcu, X. Yuan, E. Mimnaugh, C. Patterson, and L. Neckers
Chaperone-dependent E3 ubiquitin ligase CHIP mediates a degradative pathway for c-ErbB2/Neu
PNAS, October 1, 2002; 99(20): 12847 - 12852.
[Abstract] [Full Text] [PDF]


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Am. J. Pathol.Home page
M. D. Basson
Gut Mucosal Healing : Is the Science Relevant?
Am. J. Pathol., October 1, 2002; 161(4): 1101 - 1105.
[Full Text] [PDF]


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Cold Spring Harb Symp Quant BiolHome page
J.M. ARBEIT
Quiescent Hypervascularity Mediated by Gain of HIF-1{alpha} Function
Cold Spring Harb Symp Quant Biol, January 1, 2002; 67(0): 133 - 142.
[Abstract] [PDF]




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