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5‐Fluorouracil combined with apigenin enhances anticancer activity through mitochondrial membrane potential (ΔΨm)‐mediated apoptosis in hepatocellular carcinoma
Author(s) -
Hu XiaoYun,
Liang JiYun,
Guo XueJun,
Liu Li,
Guo YaBing
Publication year - 2015
Publication title -
clinical and experimental pharmacology and physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 103
eISSN - 1440-1681
pISSN - 0305-1870
DOI - 10.1111/1440-1681.12333
Subject(s) - apigenin , apoptosis , propidium iodide , chemistry , reactive oxygen species , annexin , cytotoxicity , pharmacology , in vivo , cancer research , poly adp ribose polymerase , microbiology and biotechnology , biochemistry , in vitro , programmed cell death , biology , polymerase , antioxidant , flavonoid , gene
Summary The development of chemoresistance may reduce the efficacy of chemotherapeutic drugs for treating hepatocellular carcinoma (HCC). In the present study, the effects of apigenin on intensifying the chemosensitivity of HCC cells and an HCC xenograft model in response to 5‐fluorouracil (5‐FU) were investigated. Sub‐toxic concentrations of apigenin (4 μ mol/L) significantly enhanced the cytotoxicity of 5‐FU (100 μ g/mL) in HCC cells. In vivo , combined treatment with apigenin (20 mg/kg, five times/week for 3 weeks) and 5‐FU (20 mg/kg for 5 consecutive days) significantly inhibited the growth of HCC xenograft tumours. Annexin V–propidium iodide dual staining assays, terminal deoxyribonucleotidyl transferase‐mediated dUTP–digoxigenin nick end‐labelling assays and western blotting analysis were used to confirm the synergistic effects of apigenin and 5‐FU on HCC apoptosis. Coincubation of HCC cells with apigenin and 5‐FU increased levels of reactive oxygen species (ROS), which was followed by a decrease in the mitochondrial membrane potential (ΔΨm). In addition, combined triggered the mitochondrial apoptotic pathway, as indicated by decreased Bcl‐2 expression and loss of ΔΨm, with significant activation of caspase 3 and poly(ADP‐ribose) polymerase. The present study is the first to demonstrate that apigenin may potentiate the cytotoxicity of 5‐FU in HCC via inhibition of ROS‐mediated drug resistance and concurrent activation of the mitochondrial pathways of apoptosis.