Journal
FOOD AND CHEMICAL TOXICOLOGY
Volume 46, Issue 11, Pages 3486-3492Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.fct.2008.08.026
Keywords
Kalopanaxsaponin A; Apoptosis; Mitochondrial membrane potential; Calcium; Caspase-8
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Funding
- MOST [R13-2007-019-00000-0]
- National Research Foundation of Korea [R13-2007-019-01001-0, 과06A2101] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In the present study, we investigated the effect of KPS-A on the apoptotic activity and the molecular mechanism of the action in human leukemia. Treatment with KPS-A significantly increased apoptotic DNA fragmentation in human histiocytic lymphoma U937 cells as shown by DAPI staining, flow cytometry, and agarose gel electrophoresis. In addition, stimulation of U937 cell with KPS-A induced a series of intracellular events: (1) the activations of caspase-8, caspase-9, and caspase-3: (2) the translocations of Bid and Bax proteins to mitochondria; (3) the loss of mitochondrial membrane potential; and (4) the increased release of cytochrome c to the cytosol. Pretreatment with a specific caspases-8, -9 or -3 inhibitor, neutralized the pro-apoptotic activity of KPS-A in U937 cells. We further demonstrated that KPS-A markedly induced an increase in intracellular Ca2+ level, which was reversed by EGTA, a general calcium chelator, but not by TMB-8 and dantrolene, intracellular Ca2+ release blockers. Moreover, KPS-A-induced DNA fragmentation and caspase activation were substantially reduced in the presence of ECTA. Taken together, these results suggest that KPS-A may play therapeutic role for leukemia via the potent apoptotic activity through Ca2+/caspases-8/MPT/caspases-9/caspases-3 signaling pathway. (C) 2008 Elsevier Ltd. All rights reserved.
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