Synergistic Effects of 5-Fluorouracil and Gambogenic Acid on A549 Cells : Activation of Cell Death Caused by Apoptotic and Necroptotic Mechanisms via the ROS-Mitochondria Pathway

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  • Su Jingjing
    Key Laboratory of Xin’an Medicine, Ministry of Education, Anhui Province Key Laboratory of R&D of Chinese Medicine, Anhui University of Chinese Medicine, Anhui Academy of Chinese Medicine
  • Cheng Hui
    Key Laboratory of Xin’an Medicine, Ministry of Education, Anhui Province Key Laboratory of R&D of Chinese Medicine, Anhui University of Chinese Medicine, Anhui Academy of Chinese Medicine
  • Zhang Dandan
    Key Laboratory of Xin’an Medicine, Ministry of Education, Anhui Province Key Laboratory of R&D of Chinese Medicine, Anhui University of Chinese Medicine, Anhui Academy of Chinese Medicine
  • Wang Mei
    Key Laboratory of Xin’an Medicine, Ministry of Education, Anhui Province Key Laboratory of R&D of Chinese Medicine, Anhui University of Chinese Medicine, Anhui Academy of Chinese Medicine
  • Xie Chenye
    Key Laboratory of Xin’an Medicine, Ministry of Education, Anhui Province Key Laboratory of R&D of Chinese Medicine, Anhui University of Chinese Medicine, Anhui Academy of Chinese Medicine
  • Hu Yawen
    Key Laboratory of Xin’an Medicine, Ministry of Education, Anhui Province Key Laboratory of R&D of Chinese Medicine, Anhui University of Chinese Medicine, Anhui Academy of Chinese Medicine
  • Chang Hebron Chun-Wei
    Department of Biotechnology, Asia University
  • Li Qinglin
    Key Laboratory of Xin’an Medicine, Ministry of Education, Anhui Province Key Laboratory of R&D of Chinese Medicine, Anhui University of Chinese Medicine, Anhui Academy of Chinese Medicine

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  • Synergistic Effects of 5-Fluorouracil and Gambogenic Acid on A549 Cells: Activation of Cell Death Caused by Apoptotic and Necroptotic Mechanisms <i>via</i> the ROS-Mitochondria Pathway

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5-Fluorouracil (5-FU) is one of the widely used chemotherapeutic drugs for various cancer treatments, but its chemo-drug resistance is a major obstacle in clinical settings. The anticancer effects of gambogenic acid (GNA) and its potential mechanisms have been well documented in the past few years. In this study, we determined the synergistic inhibitory effects of GNA and 5-FU on A549 human lung cancer cells. 5-FU combined with GNA inhibited the viability of A549 cells in a concentration-dependent manner. The mitochondrial tolerance of this two-kind of drugs combination treatment was stronger than a single-drug treatment. Combination treatment caused a morphological change of A549 cells. Flow cytometric evidence indicated that the combined treatment caused significant cell death, with the death rate of A549 cells treated with combination drugs showing a time-dependent manner. Furthermore, combination treatment of GNA and 5-FU showed up-regulated of caspase-3, caspase-9, bax, RIP1, apoptosis-inducing factor (AIF), voltage-dependent anion channel (VDAC), cytochrome c and cyclophilin D and down-regulated bcl-2. In conclusion, in addition to the activation of caspase-dependent apoptosis, the combination of GNA and 5-FU might also cause cell death of A549 cells by activating caspase-independent necroptosis. These mechanisms may be due to the toxicity of targeted toxin to mitochondria via the mitochondrial pathway.

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