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Title: Naturally occurring asteriscunolide A induces apoptosis and activation of mitogen-activated protein kinase pathway in human tumor cell lines
Authors: Negrín, Gledy
Eiroa, José L. 
Morales, Manuel
Triana, Jorge
Quintana, Jose 
Estévez, Francisco 
Keywords: Human Leukemia-Cells
Sesquiterpene Lactone Parthenolide
G(2)-M Phase Arrest
Mediated Apoptosis
Oxidative Stress, et al
Issue Date: 2010
Publisher: 0899-1987
Project: Desarrollo de Nuevos, Mas Seguros y Mas Efectivos Compuestos Antileucemicos 
Evaluación de Tdf Como Potencial Fármaco Antitumoral. 
Journal: Molecular Carcinogenesis 
Abstract: Sesquiterpene lactones have attracted much attention because they display a wide range of biological activities, including antitumor properties. Here, we show the effects of the naturally occurring sesquiterpene lactone asteriscunolide A (AS) on viability of human melanoma, leukemia and cells that overexpress antiapoptotic proteins, namely Bcl-2 and Bcl-x(L). All cell lines were sensitive to this compound, with IC50 values of similar to 5 mu M. The cytotoxic effects of AS were accompanied by a G(2)-M phase arrest of the cell cycle and a concentration- and time-dependent appearance of apoptosis as determined by DNA fragmentation, translocation of phosphatidylserine to the cell surface and sub-G(1) ratio. Apoptosis was associated with caspase-3 activity and poly(ADP-ribose) polymerase cleavage and was prevented by the nonspecific caspase inhibitor z-VAD-fmk, indicating that caspases are essential components in this pathway. The apoptotic effect of AS was also associated with (i) the release of cytochrome c from mitochondria which was accompanied by dissipation of the mitochondrial membrane potential (Delta Psi(m)) and (ii) the activation of the mitogen-activated protein kinases (MAPKs) pathway. AS-induced cell death was potentiated by inhibition of extracellular signal-regulated kinases (ERK) 1/2 signaling with U0126 and PD98059. Intracellular reactive oxygen species (ROS) seem to play a pivotal role in this process since high levels of ROS were produced early (1 h) and apoptosis was completely blocked by the free radical scavenger N-acetyl-L-cysteine (NAC). The present study demonstrates that AS-induced cell death is mediated by an intrinsic-dependent apoptotic event involving mitochondria and MAPKs, and through a mechanism dependent on ROS generation. (C) 2010 Wiley-Liss, Inc.
ISSN: 0899-1987
DOI: 10.1002/mc.20629
Source: Molecular Carcinogenesis[ISSN 0899-1987],v. 49, p. 488-499
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