期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 59, 期 6, 页码 2347-2355出版社
AMER CHEMICAL SOC
DOI: 10.1021/jf105003n
关键词
Tithonia diversifolia methanolic extract (TDM); tagitinin C; H-1 NMR; apoptosis; autophagy
资金
- National Science Council of the Republic of China [NSC 97-2113-M-264-001-CC3, NSC 98-2622-M-264-002-CC3]
The Tithonia diversifolia methanolic extract (TDM), which showed antiproliferative activity against human glioblastoma U373 cells, with an IC50 value of 59.2 +/- 3.7 mu g mL(-1), was passed through silica gel chromatography and successively eluted with different percentages of EtOAc/hexane. The 10-60% EtOAc/hexane subtractions, which exhibited a comparatively higher antiproliferative activity, were isolated, and then structural identification was proceeded with H-1 nuclear magnetic resonance. The isolated compound was tagitinin C, a kind of sesquiterpenoid. The IC50 value was 6.1 +/- 0.1 mu g mL(-1) in U373 treated with tagitinin C. In flow cytometric analysis and inhibition of pan-caspase, the results showed that the anti-glioblastoma effect was apoptosis-independent. In PARP, p-p38, ULK1, and LC3-II expression, the anti-glioblastoma induced by tagitinin C was likely via autophagy. In the ULK1 siRNA transfection experiment; autophagy blockade counteracted the suppression induced by tagitinin C. The result suggested that tagitinin C induces U373 cell death dependent upon autophagy under certain conditions.
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