Journal
BIOORGANIC & MEDICINAL CHEMISTRY
Volume 16, Issue 4, Pages 1756-1763Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bmc.2007.11.022
Keywords
apoptosis; TRAIL-R2; sesquiterpenoid dimer; caspase
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Parviflorene F (1), a novel sesquiterpenoid dimer isolated from Curcuma parviflora Wall, is a cytotoxic compound. In this study, we examined the mechanism of its cytotoxic effect in HeLa cells. Treatment with 1enhanced the mRNA and protein expression of TRAIL-R2 (tumor necrosis factor a-related apoptosis inducing ligand receptor 2). Apoptosis was induced by 1 as revealed by the distribution of DNA and Annexin V/PI staining using flow cytometry. In addition, 1-induced apoptosis was inhibited by human recombinant TRAIL-R2/Fc chimera protein, TRAIL-neutralizing fusion protein. Also, we found that 1 induced the activation of caspase-8, caspase-9, and caspase-3, indicating that the cytotoxic effect of 1 is correlated with apoptosis by a caspase-dependent mechanism through TRAIL-R2. In addition, 1 enhanced TRAIL-induced cell death against HeLa and TRAIL-resistant DLD1 cells. Taken together, up-regulation of TRAIL-R2 by 1 may contribute to sensitization of TRAIL-induced cell death. (C) 2007 Elsevier Ltd. All rights reserved.
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