Kaempferol exhibits a synergistic effect with doxorubicin to inhibit proliferation, migration, and invasion of liver cancer

Yang,Guang; Xing,Jun; Aikemu,Batuer; Sun,Jing; Zheng,Minhua

doi:10.3892/or.2021.7983

Kaempferol exhibits a synergistic effect with doxorubicin to inhibit proliferation, migration, and invasion of liver cancer

Authors:
- Guang Yang
- Jun Xing
- Batuer Aikemu
- Jing Sun
- Minhua Zheng
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Affiliations: Department of General Surgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200001, P.R. China, Department of PET/CT Center, Shanxi Provincial Cancer Hospital, Taiyuan, Shanxi 030001, P.R. China
Published online on: February 18, 2021 https://doi.org/10.3892/or.2021.7983
Article Number: 32
Copyright: © Yang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Kaempferol (KF), a flavonoid compound isolated from herbal medicines, has been reported to play a significant role in inhibiting certain types of cancer. Although recent studies reported that KF exerted inhibitive activity on liver cancer, they failed to elucidate the signaling pathways and synergistic effects in combination with chemotherapeutic drugs currently in use in the clinical setting. In the present study, the signaling pathways and synergistic effects of KF in liver cancer cells were investigated. Nine liver cancer cell lines were used to assess the inhibitive activity and synergistic effects of KF. Cellular behavioral experiments, such as viability, colony formation, cell cycle arrest, apoptotic, wound healing, and Transwell assays were used to assess the effects of KF on the proliferation, apoptosis, migration, and invasion of liver cancer cells. Western blotting was performed to validate the key signaling pathway elements underlying those cellular behaviors. KF exhibited inhibitory effects on nine liver cancer cell lines in time‑ and dose‑dependent manners and was mostly nontoxic to the normal hepatocyte cells. The combination of KF and doxorubicin revealed a stronger inhibitive effect on the viability of liver cancer cells. Combination therapy also revealed higher suppressive effects on colony formation, cell cycle progression, survival, DNA damage response, and mitochondrial function. By western blotting assay, mitochondrial and caspase signaling pathways were determined to be involved in proliferation inhibition. In wound healing and Transwell invasion assays, combination therapy also exhibited more robust inhibitory activity in blocking the migration and invasion of liver cancer cells. PI3K/mTOR/MMP protein pathways were also revealed to be related to cell migration inhibition. KF alone exhibited an inhibitory effect on proliferation, migration, and invasion of liver cancer cells, and its synergistic effects revealed stronger inhibitory activities. The present data indicated that KF is a promising candidate as a complementary medicine to conventional chemotherapeutic drugs.

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