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Expression by the Epidermal Growth Factor/Phosphatidylinositol 3-Kinase/PTEN/AKT/FRAP Pathway in Human Prostate Cancer Cells: Implications for Tumor Angiogenesis and Therapeutics1
The Johns Hopkins Oncology Center, Brady Urological Institute [H. Z., C. H., J. W. S.] and Departments of Pediatrics and Medicine and Institute of Genetic Medicine [K. C., D. F., E. L., G. L. S.], The Johns Hopkins University School of Medicine, Baltimore, Maryland 21287, and Laboratory of Molecular Oncology, The Rockefeller University, New York, New York 10021 [M-M. G.]
Dysregulated signal transduction from receptor tyrosine kinases to
phosphatidylinositol 3-kinase (PI3K), AKT (protein kinase B), and its
effector FKBP-rapamycin-associated protein (FRAP) occurs via autocrine
stimulation or inactivation of the tumor suppressor PTEN in many
cancers. Here we demonstrate that in human prostate cancer cells,
basal-, growth factor-, and mitogen-induced expression of
hypoxia-inducible factor 1 (HIF-1)
, the regulated subunit of the
transcription factor HIF-1, is blocked by LY294002 and rapamycin,
inhibitors of PI3K and FRAP, respectively. HIF-1-dependent gene
transcription is blocked by dominant-negative AKT or PI3K and by
wild-type PTEN, whereas transcription is stimulated by constitutively
active AKT or dominant-negative PTEN. LY294002 and rapamycin also
inhibit growth factor- and mitogen-induced secretion of vascular
endothelial growth factor, the product of a known HIF-1 target gene,
thus linking the PI3K/PTEN/AKT/FRAP pathway, HIF-1, and tumor
angiogenesis. These data indicate that pharmacological agents that
target PI3K, AKT, or FRAP in tumor cells inhibit HIF-1
expression
and that such inhibition may contribute to therapeutic efficacy.
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