Carcinogenesis Advance Access originally published online on February 10, 2005
Carcinogenesis 2005 26(5):968-975; doi:10.1093/carcin/bgi041
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Carcinogenesis vol.26 no.5 © Oxford University Press 2005; all rights reserved.
Antitumor mechanism of evodiamine, a constituent from Chinese herb Evodiae fructus, in human multiple-drug resistant breast cancer NCI/ADR-RES cells in vitro and in vivo
1 Pharmacological Institute and 2 School of Pharmacy, College of Medicine, National Taiwan University, Taipei 100, Taiwan
* To whom correspondence should be addressed at: Room 1143, No. 1, Jen-Ai Road, Sec. 1, Pharmacological Institute, College of Medicine, National Taiwan University, Taipei 100, Taiwan. Tel/Fax: +886-2-2322-1742; Email: cmteng{at}ntumc.org
Drug resistance is one of the main obstacles to the successful treatment of cancer. The availability of agents that are highly effective against drug-resistant cancer cells is therefore essential. The present study was performed to examine the anticancer effects of evodiamine, a major constituent of the Chinese herb Evodiae fructus, in adriamycin-resistant human breast cancer NCI/ADR-RES cells. Evodiamine inhibited the proliferation of NCI/ADR-RES cells in a concentration-dependent manner with a GI50 of 0.59 ± 0.11 µM. This agent also caused a substantial apoptosis at 1 µM. FACScan flow cytometric analysis of cell cycle progression revealed that a G2/M arrest was initiated after a 12-h exposure to the drug. Evodiamine increased tubulin polymerization as determined by the immunocytochemical and in vivo tubulin polymerization analyses. In a time- and concentration-dependent manner, evodiamine also promoted the phosphorylations of Raf-1 kinase and Bcl-2. The phosphorylation site of Raf-1 kinase was identified to be serine338. The in vivo anticancer effects of evodiamine were evaluated in Balb-c/nude mice following a tumor xenograft implantation of NCI/ADR-RES cells. The antitumor activity of evodiamine against the human multiple-drug resistant tumor xenograft was found to be superior to that of paclitaxel. Evodiamine therefore represents a highly promising chemotherapeutic agent in the treatment of human multiple-drug resistant cancer cells.
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