Journal
ONCOLOGY LETTERS
Volume 1, Issue 4, Pages 657-662Publisher
SPANDIDOS PUBL LTD
DOI: 10.3892/ol_00000115
Keywords
hypoxia-inducible factor-1 alpha; cell growth; apoptosis caspase 3,B cell lymphoma
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Funding
- National Natural Science Foundation of China [30560057, 30860331]
- Inner Mongolia Natural Science Foundation [200508010911]
- Science and Technology Inner Mongolia Medical College [NY2004ZD001]
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The role of hypoxia-inducible factor-1 (HIF-1) in tumor development and progression is well-established but its effect on tumor growth remains controversial The present study investigated the effect of HIF-1 on tumor growth using the estrogen receptor-negative breast cancer cell line, MDA-MB-231 Using Western blotting, we detected a higher level of HIF-1 alpha protein in MDA-MB-231 cells than in any other breast cancer cell lines analyzed, and this was accompanied by a more rapid growth pattern Interruption of HIF-1 alpha expression using small interference RNA (siRNA) significantly suppressed cell growth and increased apoptosis, but the cell cycle was not affected Activated fragments with increased caspase 3 activity and a mobility shift of B cell lymphoma (Bcl-2) were also detected in cells treated with HIF-1 alpha siRNA HIF-1 allows breast cancer cells to grow under long-term serum deprivation by inactivation of the caspase cascade and thus inhibition of apoptosis Blocking HIF-1 alpha protein resulted in loss of Bcl-2 function, which may contribute to the activation of the caspase cascade
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