Kaempferol induces ATM/p53-mediated death receptor and mitochondrial apoptosis in human umbilical vein endothelial cells

Lee,Chiu-Fang; Yang,Jai‑Sing; Tsai,Fuu-Jen; Chiang,Ni-Na; Lu,Chi‑Cheng; Huang,Yu-Syuan; Chen,Chun; Chen,Fu-An

doi:10.3892/ijo.2016.3420

Kaempferol induces ATM/p53-mediated death receptor and mitochondrial apoptosis in human umbilical vein endothelial cells

Authors:
- Chiu-Fang Lee
- Jai‑Sing Yang
- Fuu-Jen Tsai
- Ni-Na Chiang
- Chi‑Cheng Lu
- Yu-Syuan Huang
- Chun Chen
- Fu-An Chen
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Affiliations: Kaohsiung Veterans General Hospital Pingtung Branch, Pingtung, Taiwan, R.O.C., Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan, R.O.C., Human Genetic Center, China Medical University Hospital, Taichung, Taiwan, R.O.C., School of Nutrition and Health Sciences, Taipei Medical University, Taipei, Taiwan, R.O.C., Department of Pharmacy and Master Program, Tajen University, Pingtung, Taiwan, R.O.C.
Published online on: March 4, 2016 https://doi.org/10.3892/ijo.2016.3420
Pages: 2007-2014

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Abstract

Kaempferol is a member of the flavonoid compounds found in vegetables and fruits. It is shown to exhibit biological impact and anticancer activity, but no report exists on the angiogenic effect of kaempferol and induction of cell apoptosis in vitro. In this study, we investigated the role of kaempferol on anti-angiogenic property and the apoptotic mechanism of human umbilical vein endothelial cells (HUVECs). Our results demonstrated that kaempferol decreased HUVEC viability in a time- and concentration-dependent manner. Kaempferol also induced morphological changes and sub-G1 phase cell population (apoptotic cells). Kaempferol triggered apoptosis of HUVECs as detecting by DNA fragmentation, comet assay and immunofluorescent staining for activated caspase-3. The caspase signals, including caspase-8, -9 and -3, were time-dependently activated in HUVECs after kaempferol exposure. Furthermore, pre-treatment with a specific inhibitor of caspase-8 (Z-IETD-FMK) significantly reduced the activity of caspase-8, -9 and -3, indicating that extrinsic pathway is a major signaling pathway in kaempferol-treated HUVECs. Importantly, kaempferol promoted reactive oxygen species (ROS) evaluated using flow cytometric assay in HUVECs. We further investigated the upstream extrinsic pathway and showed that kaempferol stimulated death receptor signals [Fas/CD95, death receptor 4 (DR4) and DR5] through increasing the levels of phosphorylated p53 and phosphorylated ATM pathways in HUVECs, which can be individually confirmed by N-acetylcysteine (NAC), ATM specific inhibitor (caffeine) and p53 siRNA. Based on these results, kaempferol-induced HUVEC apoptosis was involved in an ROS-mediated p53/ATM/death receptor signaling. Kaempferol might possess therapeutic effects on cancer treatment in anti-vascular targeting.

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