Cancer Lett 2008 Sep 2;269(1):139-47. Epub 2008 Jun 2.
Department of Biochemistry, University of Las Palmas de Gran Canaria, Plaza Dr. Pasteur s/n, 35016 Las Palmas de Gran Canaria, Spain.
In this study, we investigated the effect of three synthetic alpha-methylene-gamma-butyrolactones (MBL) on viability of 10 human tumor cell lines and found that these lactones were highly cytotoxic against leukemia cells. Studies performed on HL-60 cells indicate that MBL induce G(2)-M arrest and apoptosis through a caspase-dependent mechanism. Apoptosis was associated to cytochrome c release, cleavage of procaspases-9 and -3, and hydrolysis of PARP. Intracellular reactive oxygen species (ROS) seem to play a key role since high levels of ROS were produced early (<15 min) and apoptosis was completely abrogated by the free radical scavenger N-acetyl-L-cysteine (NAC).
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