Journal article
Dimerization of Mitochondrial Bax Is Associated With Increased Drug Response in Bax-Transfected A253 Cells
Oncology research, Vol.11(2), pp.91-99
01/01/1999
PMID: 10489165
Abstract
Human head and neck squamous cell carcinoma A253 cells, which do not express p53 and p21 proteins, were engineered to stably express about 50-fold higher level of Bax protein (A253/Bax) than the mock-transfected (A253/vec) or parental cells. Using these cell lines, studies were carried
out to evaluate the role of Bax in response to anticancer drugs and to study the associated mechanisms. A253/Bax cells exhibited a significant increase in in vitro sensitivity to various anticancer drugs, including tomudex (9.5-fold), SN-38 (13.8-fold), doxorubicin (7.9-fold), taxol (3.1-fold),
5-FU (2.7-fold), and 5-FU/LV (4.5-fold). Increased level of drug-induced apoptosis was observed in A253/Bax cells in a drug concentration dependent manner. In untreated A253/Bax cells, Bax was expressed in a monomeric state. Treatment with tomudex induced the formation of Bax dimer in a drug
concentration-dependent manner. Dimerization of Bax occurred only in mitochondria, while the cytosolic Bax was retained in the monomeric state. Low level of Bax dimerization was also detected in parental A253 cells following tomudex exposure. In addition, Bax dimer formation was associated
with mitochondrial cytochrome c release and activation of caspases in A253/Bax cells. The data suggest that Bax overexpression increases drug response by enhancing drug-induced apoptosis. Furthermore, dimerization of mitochondrial Bax and downstream mechanisms are associated with drug-induced
apoptotic cell death and increased drug sensitivity.
Details
- Title: Subtitle
- Dimerization of Mitochondrial Bax Is Associated With Increased Drug Response in Bax-Transfected A253 Cells
- Creators
- Bin GuoMing-biao YinKároly TóthShousong CaoRami G AzrakYoucef M Rustum
- Resource Type
- Journal article
- Publication Details
- Oncology research, Vol.11(2), pp.91-99
- Publisher
- Cognizant Communication Corporation
- PMID
- 10489165
- ISSN
- 0965-0407
- eISSN
- 1555-3906
- Language
- English
- Date published
- 01/01/1999
- Academic Unit
- Hematology, Oncology, and Blood & Marrow Transplantation; Internal Medicine
- Record Identifier
- 9984359952902771
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