NR4A1-induced increase in the sensitivity of a human gastric cancer line to TNFα-mediated apoptosis is associated with the inhibition of JNK/Parkin-dependent mitophagy

Yan,Hongzhu; Xiao,Feng; Zou,Jue; Qiu,Chengmin; Sun,Weiwei; Gu,Minmin; Zhang,Li

doi:10.3892/ijo.2017.4216

NR4A1-induced increase in the sensitivity of a human gastric cancer line to TNFα-mediated apoptosis is associated with the inhibition of JNK/Parkin-dependent mitophagy

Authors:
- Hongzhu Yan
- Feng Xiao
- Jue Zou
- Chengmin Qiu
- Weiwei Sun
- Minmin Gu
- Li Zhang
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Affiliations: Department of Pathology, Seventh People's Hospital of Shanghai University of TCM, Shanghai 200137, P.R. China, Department of Pathology, Songjiang Hospital Affiliated to Τhe First People's Hospital, Shanghai Jiao Tong University, Shanghai 201600, P.R. China
Published online on: December 4, 2017 https://doi.org/10.3892/ijo.2017.4216
Pages: 367-378
Copyright: © Yan et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Tumor necrosis factor α (TNFα)-based immunotherapy is the vital host defense system against the progression of gastric cancer (GC) as a pro-inflammatory and pro-apoptotic cytokine. However, resistance limits its therapeutic efficiency. Therefore, an increasing number of studies are focusing on the development of drugs or methods with which to enhance the treatment efficacy of TNFα. Nuclear receptor subfamily 4 group A member 1 (NR4A1) has been shown to exert antitumor effects through several mechanisms, such as by inhibiting proliferation, as well as pro-apoptotic and potent pro-oxidant effects. In this study, we examined the effects and mechanisms of action of NR4A1 on the apoptosis of GC cells treated with TNFα, with particular focus on mitochondrial homeostasis. We found that TNFα treatment decreased NR4A1 expression. Moreover, the overexpression of NR4A1 in the presence of TNFα further increased GC cell apoptosis. Mechanistically, the overexpression of NR4A1 augmented caspase-9-dependent mitochondrial apoptosis, as evidenced by reduced mitochondrial membrane potential, reactive oxygen species (ROS) overproduction, mitochondrial permeability transition pore (mPTP) opening and the leakage of cytochrome c (Cyt-c) leakage. Moreover, NR4A1 overexpression also evoked mitochondrial energy disorder via the suppression of mitochondrial respiratory complex expression. Furthermore, we found that TNFα treatment activated Parkin-dependent mitophagy. Excessive Parkin-dependent mitophagy blocked mitochondrial apoptosis, undermining the toxic effects of TNFα on cells. However, NR4A1 overexpression suppressed Parkin-dependent mitophagy via the inhibition of c-Jun N-terminal kinase (JNK). Re-activation of the JNK/Parkin pathway abrogated the inhibitory effects of NR4A1 on mitophagy, eventually limiting cell apoptosis. Collectively, this study confirmed that NR4A1 sensitizes GC cells to TNFα-induced apoptosis through the inhibition of JNK/Parkin-dependent mitophagy.

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