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Targeting Catalase but Not Peroxiredoxins Enhances Arsenic Trioxide-Induced Apoptosis in K562 Cells.
- Source :
- PLoS ONE; Aug2014, Vol. 9 Issue 8, p1-6, 6p
- Publication Year :
- 2014
-
Abstract
- Despite considerable efficacy of arsenic trioxide (As<subscript>2</subscript>O<subscript>3</subscript>) in acute promyelocytic leukemia (APL) treatment, other non-APL leukemias, such as chronic myeloid leukemia (CML), are less sensitive to As<subscript>2</subscript>O<subscript>3</subscript> treatment. However, the underlying mechanism is not well understood. Here we show that relative As<subscript>2</subscript>O<subscript>3</subscript>-resistant K562 cells have significantly lower ROS levels than As<subscript>2</subscript>O<subscript>3</subscript>-sensitive NB4 cells. We compared the expression of several antioxidant enzymes in these two cell lines and found that peroxiredoxin 1/2/6 and catalase are expressed at high levels in K562 cells. We further investigated the possible role of peroxirdoxin 1/2/6 and catalase in determining the cellular sensitivity to As<subscript>2</subscript>O<subscript>3</subscript>. Interestingly, knockdown of peroxiredoxin 1/2/6 did not increase the susceptibility of K562 cells to As<subscript>2</subscript>O<subscript>3</subscript>. On the contrary, knockdown of catalase markedly enhanced As<subscript>2</subscript>O<subscript>3</subscript>-induced apoptosis. In addition, we provide evidence that overexpression of BCR/ABL cannot increase the expression of PRDX 1/2/6 and catalase. The current study reveals that the functional role of antioxidant enzymes is cellular context and treatment agents dependent; targeting catalase may represent a novel strategy to improve the efficacy of As<subscript>2</subscript>O<subscript>3</subscript> in CML treatment. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 19326203
- Volume :
- 9
- Issue :
- 8
- Database :
- Complementary Index
- Journal :
- PLoS ONE
- Publication Type :
- Academic Journal
- Accession number :
- 97802196
- Full Text :
- https://doi.org/10.1371/journal.pone.0104985