Gallic acid induces apoptosis and enhances the anticancer effects of cisplatin in human small cell lung cancer H446 cell line via the ROS-dependent mitochondrial apoptotic pathway

Wang,Ruixuan; Ma,Lijie; Weng,Dan; Yao,Jiahui; Liu,Xueying; Jin,Faguang

doi:10.3892/or.2016.4690

Gallic acid induces apoptosis and enhances the anticancer effects of cisplatin in human small cell lung cancer H446 cell line via the ROS-dependent mitochondrial apoptotic pathway

Authors:
- Ruixuan Wang
- Lijie Ma
- Dan Weng
- Jiahui Yao
- Xueying Liu
- Faguang Jin
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Affiliations: Department of Respiration, Tangdu Hospital, Fourth Military Medical University, Xi'an, Shaanxi 710038, P.R. China, Department of Gynaecology and Obstetrics, Tangdu Hospital, Fourth Military Medical University, Xi'an, Shaanxi 710038, P.R. China, Department of Medicinal Chemistry, School of Pharmacy, The Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
Published online on: March 17, 2016 https://doi.org/10.3892/or.2016.4690
Pages: 3075-3083

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Abstract

Small cell lung cancer (SCLC) is the most aggressive lung cancer subtype and accounts for more than 15% of all lung cancer cases. Cisplatin [cis-diamminedichloroplatinum (CDDP)]-based combination chemotherapy is the cornerstone for all stages of SCLC. However, acquired multidrug resistance (MDR) and intolerable toxicities lead to a high mortality rate in SCLC patients. Gallic acid [3,4,5-trihydroxybenzoic acid (GA)] is a natural botanic phenolic compound which can induce cell apoptosis in several types of cancers. In the present study, we aimed to explore the anticancer effects of GA on human SCLC H446 cells and its promotive effects on the anticancer activities of cisplatin. The viability of the H446 cells was analyzed by MTT assay. Morphological changes in the H446 cells were observed under an inverted microscope. Apoptosis induction was determined by Annexin V-fluorescein isothiocyanate (FITC)/propidium iodide (PI) staining. The level of reactive oxygen species (ROS) was assessed by 2'7'-dichlorofluorescein diacetate (DCFH‑DA), mitochondrial membrane potential (MMP) by JC-1, and western blotting was used to examine the expression of mitochondrial apoptosis-related proteins. The results showed that both GA and cisplatin changed the morphology, inhibited the growth and induced apoptosis in the H446 cells by inducing generation of ROS, disruption of MMP, downregulation of XIAP expression, and upregulation of Bax, Apaf-1, DIABLO and p53 expression. More importantly, GA combined with cisplatin exhibited synergistic effects on inducing of these pro-apoptotic mediators and modulating the activation of apoptosis-related molecules. However, inhibition of the generation of ROS by N-acetyl-l-cysteine (NAC), a specific ROS inhibitor, reversed the cell apoptosis induced by cisplatin combined with GA. In conclusion, the results from the present study revealed that GA exhibited an anticancer effect on human SCLC H446 cells and enhanced the antitumor activities of cisplatin via the ROS-dependent mitochondrial apoptotic pathway.

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