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- Title
Reduction of hypoxia-induced angiogenesis in ovarian cancer cells by inhibition of HIF-1 alpha gene expression.
- Authors
Bryant, Christopher; Munkarah, Adnan; Kumar, Sanjeev; Batchu, Ramesh; Shah, Jay; Berman, Jeremy; Morris, Robert; Jiang, Zhong; Saed, Ghassan; Bryant, Christopher S; Munkarah, Adnan R; Batchu, Ramesh B; Shah, Jay P; Morris, Robert T; Jiang, Zhong L; Saed, Ghassan M
- Abstract
<bold>Purpose: </bold>The goal of this study was to investigate the effects of silencing HIF-1 alpha gene expression with specific small interfering RNA (siRNA) on VEGF production and angiogenesis in epithelial ovarian cancer (EOC) cells. <bold>Methods: </bold>Two EOC cell lines, MDAH-2774 and SKOV-3, were cultured under normoxic (20% O(2)) and hypoxic (2% O(2)) conditions using standard techniques. After EOC cells were transfected with siRNA, HIF-1 alpha and VEGF mRNA levels were measured by real-time RT-PCR. Angiogenesis was evaluated utilizing an in vitro assay model consisting of human umbilical vein endothelial cells (HUVEC) and polymerized ECM Matrix. <bold>Results: </bold>Both EOC cell lines evaluated constitutively expressed HIF-1 alpha and VEGF mRNA. HIF-1 alpha and VEGF mRNA levels were significantly increased in response to hypoxia (P < 0.05). Under hypoxic conditions, inhibition of HIF-1 alpha gene expression by a specific siRNA resulted in a significant reduction in HIF-1 alpha and VEGF mRNA levels (P < 0.05). In the in vitro angiogenesis model, supernatant from the hypoxic EOC cells induced the HUVEC to form a complex tubular network, a hallmark of angiogenesis. Semi-quantitative analysis of the angiogenesis assay revealed a significant reduction in tube formation when supernatant from HIF-1 alpha siRNA-treated hypoxic EOC cell was used (P < 0.05). <bold>Conclusion: </bold>Inhibition of HIF-1 alpha expression by specific siRNA resulted in a significant decrease in VEGF production and angiogenesis. Further investigation of HIF-1 alpha inhibition for anti-tumor activity is warranted and may potentially prove HIF-1 alpha as a therapeutic target in the management ovarian cancer.
- Subjects
GENE expression; NEOVASCULARIZATION; OVARIAN cancer; CANCER cells; HYPOXEMIA; SMALL interfering RNA
- Publication
Archives of Gynecology & Obstetrics, 2010, Vol 282, Issue 6, p677
- ISSN
0932-0067
- Publication type
journal article
- DOI
10.1007/s00404-010-1381-9