Abstract:
:Although ascorbate (Vitamin C) has been shown to inhibit cell growth and induce cell death in variety of cancer cells, results reported in other studies are inconsistent with this conclusion. It was previously reported that ascorbate induces apoptosis in human breast cancer cells. However, the molecular mechanism for this is not clear. In this study, we demonstrate that ascorbate induces cell death through the apoptosis-inducing factor (AIF) in the human breast cancer cell lines, SK-BR3 and Hs578T, but not in a normal breast cell line, Hs578. Ascorbate treatment caused the nuclear translocation of AIF, which is retained in the mitochondria in healthy cells, but caspase cleavage is not induced. Moreover, MG132, an inhibitor of AIF release from mitochondria, blocked the induction of cell death. Furthermore, cells that had been treated with human AIF-specific siRNA resisted cell death induced by ascorbate, implying that the translocation of AIF from mitochondria to the nucleus is responsible for ascorbate-mediated cell death. Therefore, these results suggest that ascorbate activates a caspase-independent and AIF-mediated cell death pathway in human breast cancer cells, SK-BR3, and Hs578T.
journal_name
Oncol Repjournal_title
Oncology reportsauthors
Hong SW,Jin DH,Hahm ES,Yim SH,Lim JS,Kim KI,Yang Y,Lee SS,Kang JS,Lee WJ,Lee WK,Lee MSsubject
Has Abstractpub_date
2007-10-01 00:00:00pages
811-5issue
4eissn
1021-335Xissn
1791-2431journal_volume
18pub_type
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