[Impact of hypoxia on taxol-induced apoptosis in human ovarian cancer cell line A2780 and its mechanism]

Lei Huang, Qi-Lin Ao, Fang Li, Hui Xing, Yun-Ping Lu, Ding Ma
Ai Zheng, Aizheng, Chinese Journal of Cancer 2005, 24 (4): 408-13

BACKGROUND & OBJECTIVE: Hypoxia, a feature and important living microenvironment of solid tumors, might be related to drug-resistance of tumors. This study was to establish a hypoxic model of ovarian cancer cell line A2780, and to investigate impacts of hypoxia and hypoxia inducible factor-1alpha (HIF-1alpha) on Taxol-induced apoptosis in A2780 cells.

METHODS: Cobalt chloride (CoCl(2)), a chemical hypoxia inducer, was added in A2780 cells to develop a hypoxic model. A2780 cells were divided into 4 groups: group A (control), group B (normoxia plus Taxol), group C (hypoxia plus Taxol), and group D (hypoxia, Decoy plus Taxol). Decoy method was used to block the function of HIF-1alpha. Protein and mRNA levels of HIF-1alpha were detected by Western blot and reverse transcription-polymerase chain reaction (RT-PCR). Cell apoptosis was detected by TdT-mediated dUTP nick end labeling (TUNEL), and flow cytometry (FCM).

RESULTS: CoCl(2) evidently increased protein level of HIF-1alpha, but had no effect on mRNA level of HIF-1alpha. Decoy didn't affect its expression. TUNEL showed that apoptotic index (AI) was significantly higher in group B,and group D than in group C after treatment of Taxol [(41.1+/-25.6)%,and (35.2+/-21.7)% vs. (24.1+/-15.2)%, P < 0.05]. The apoptosis rates detected by FCM displayed the same tendency as TUNEL results did.

CONCLUSIONS: Hypoxia could weaken the effect of Taxol on inducing apoptosis of A2780 cells. HIF-1alpha might confer to resistance of cell apoptosis induced by Taxol.

Full Text Links

Find Full Text Links for this Article


You are not logged in. Sign Up or Log In to join the discussion.

Related Papers

Remove bar
Read by QxMD icon Read

Save your favorite articles in one place with a free QxMD account.


Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"