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标题：The Methylene Chloride Fraction of Trichosanthis Fructus Induces Apoptosis in U937 Cells through the Mitochondrial Pathway
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作者：Eun-Ok Lee ; Ju-Ryoung Lee ; Kwan-Hyun Kim 等
期刊名称：Biological and Pharmaceutical Bulletin
印刷版ISSN：0918-6158
电子版ISSN：1347-5215
出版年度：2006
卷号：29
期号：1
页码：21-25
DOI：10.1248/bpb.29.21
出版社：The Pharmaceutical Society of Japan
摘要：Trichosanthis kirilowii M AXIM has been used as a folk remedy to treat diabetes, leukemia, and breast cancer. In the present study, the apoptotic mechanism of the methylene chloride fraction of Trichosanthis Fructus (MCTF) was investigated in human leukemic U937 cells. MCTF exhibited antiproliferative effectsagainst U937 cells (IC₅₀= ca. 8 μg/ml). Apoptotic bodies were observed in MCTF-treated U937 cells in the TUNEL assay. We also confirmed that MCTF significantly increases annexin V⁺/propidium iodide-cells using FACS analysis. MCTF treatment activated caspase-8, -9 and -3, and led to cleaved poly (ADP-ribose) polymerase and release of cytochrome c into cytosol in a concentration-dependent manner, while MCTF did not affect Bax or Bcl-2 protein levels as shown by Western blot analysis. Taken together, these results indicate that MCTF can induce apoptosis in U937 cells chiefly via a mitochondrial-mediated pathway and suggest that Trichosanthis Fructus can be used in cancer treatment as a chemopreventive agent.
关键词：Trichosanthis kirilowii;apoptosis;caspase;mitochondrial pathway;U937 cell