α-Tomatine-Mediated Anti-Cancer Activity In Vitro and In Vivo through Cell Cycle- and Caspase-Independent Pathways

被引:36
作者
Chao, Min-Wu [1 ]
Chen, Chun-Han [1 ]
Chang, Ya-Ling [1 ]
Teng, Che-Ming [1 ]
Pan, Shiow-Lin [2 ]
机构
[1] Natl Taiwan Univ, Coll Med, Inst Pharmacol, Taipei, Taiwan
[2] Natl Hlth Res Inst, Dept Biotechnol & Pharmaceut Res, Miaoli, Taiwan
关键词
CANCER-CELLS; BCL-2; FAMILY; APOPTOSIS PROTEIN; UP-REGULATION; SURVIVIN; DEATH; LEUKEMIA; GLYCOALKALOIDS; INHIBITION; ADJUVANT;
D O I
10.1371/journal.pone.0044093
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
alpha-Tomatine, a tomato glycoalkaloid, has been reported to possess antibiotic properties against human pathogens. However, the mechanism of its action against leukemia remains unclear. In this study, the therapeutic potential of alpha-tomatine against leukemic cells was evaluated in vitro and in vivo. Cell viability experiments showed that alpha-tomatine had significant cytotoxic effects on the human leukemia cancer cell lines HL60 and K562, and the cells were found to be in the Annexin V-positive/propidium iodide-negative phase of cell death. In addition, alpha-tomatine induced both HL60 and K562 cell apoptosis in a cell cycle-and caspase-independent manner. alpha-Tomatine exposure led to a loss of the mitochrondrial membrane potential, and this finding was consistent with that observed on activation of the Bak and Mcl-1 short form (Mcl-1s) proteins. Exposure to alpha-tomatine also triggered the release of the apoptosis-inducing factor (AIF) from the mitochondria into the nucleus and down-regulated survivin expression. Furthermore, alpha-tomatine significantly inhibited HL60 xenograft tumor growth without causing loss of body weight in severe combined immunodeficiency (SCID) mice. Immunohistochemical test showed that the reduced tumor growth in the alpha-tomatine-treated mice was a result of increased apoptosis, which was associated with increased translocation of AIF in the nucleus and decreased survivin expression ex vivo. These results suggest that alpha-tomatine may be a candidate for leukemia treatment.
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页数:13
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