23-24-dihydrocucurbitacin-b and Breast-Neoplasms

23,24-Dihydrocucurbitacin B (DHCB), a cucurbitacin-derived compound known to posses anticancer and anti-inflammatory activities. In this study, DHCB, isolated from roots of Trichosanthes kirilowli which is a traditional Chinese herb medicine used as treatments for cancer and other diseases, has been found to inhibit the proliferation of human cancer cell lines Bcap37, HeLa, SW620, SMMC-7721, K562 and MCF-7 in a dose- and time-dependent manner, and induce apoptosis in human breast cancer cell line Bcap37 at low concentration. DHCB-induced Bcap37 apoptosis was characterized with the changes in nuclear morphology, DNA fragmentation, activation of caspase-like activities, poly(ADP-ribose) polymerase cleavage, release of cytochrome c into cytosol. The cell death was partly prevented by a caspase-family inhibitor Z-VAD-FMK. The results suggest that DHCB-induced Bcap37 apoptosis through mitochondrial dependent pathway. Flow cytometric analysis revealed that at the lower dose of 1.8 and 3.6muM, DHCB-induced cancer cell lines death via an apoptotic process rather than necrotic one; whereas, the higher dose of 8.9, 17.9 and 35.7muM induced cell death via the necrotic process. Cell-cycle analysis demonstrated DHCB induction of G(2)/M phase cell-cycle arrest and apoptosis. The overall results suggest that DHCB might have the therapeutic value against human cancer cell lines, especially the breast cancer cell lines.

Topics: Amino Acid Chloromethyl Ketones; Antineoplastic Agents, Phytogenic; Apoptosis; Breast Neoplasms; Caspases; Cell Division; Cell Membrane; Cell Proliferation; Cell Shape; Cysteine Proteinase Inhibitors; Cytochromes c; DNA Fragmentation; Dose-Response Relationship, Drug; Female; G2 Phase; HeLa Cells; Humans; K562 Cells; Mitochondria; Necrosis; Plant Roots; Poly(ADP-ribose) Polymerases; Prohibitins; Trichosanthes; Triterpenes