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Sodium formate induces autophagy and apoptosis via the JNK signaling pathway of photoreceptor cells

  • Authors:
    • Ying Wang
    • Shao‑Lin Xu
    • Wen‑Jing Xu
    • Hai‑Yan Yang
    • Ping Hu
    • Yu‑Xin Li
  • View Affiliations / Copyright

    Affiliations: Department of Ophthalmology, The Second Hospital of Jilin University, Changchun, Jilin 130041, P.R. China, Department of Biology, National Engineering Laboratory for Druggable Gene and Protein Screening, Northeast Normal University, Changchun, Jilin 130024, P.R. China
    Copyright: © Wang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 1111-1118
    |
    Published online on: December 11, 2015
       https://doi.org/10.3892/mmr.2015.4675
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Abstract

Incidents associated with methanol intoxication resulting from the consumption of fake wine occur not infrequently worldwide. Certain individuals are made blind due to methanol poisoning. The present study aimed to investigate the effects of sodium formate exposure on photoreceptor cells (661W cells). The 661W cells were exposed to sodium formate for 6‑24 h and cell viability was determined using a 3‑(4,5‑dimethylthiazol‑2‑yl)‑2,5‑diphenyl‑2H‑tetrazolium bromide (MTT) assay. Subsequently, the 661W cells were exposed to 15 or 30 mM sodium formate for 24 h. The level of apoptosis was determined using Hoechst 33342/propidium iodide staining, visualizing the cells under a fluorescence microscope, and annexin V‑fluorescein isothiocyanate staining, using flow cytometric analysis. Intracellular reactive oxygen species (ROS) were measured using 2',7'‑dichlorofluorescein diacetate (DCFH‑DA) staining, followed by flow cytometric analysis. Autophagy of the 661W cells was measured by monodansylcadaverine staining. The activation of phosphorylated c‑Jun N‑terminal kinase (p‑JNK), B‑cell lymphoma (Bcl‑2), Bcl‑2‑associated X protein, cleaved caspase‑3, cleaved caspase‑9 and microtubule‑associated protein 1A/1B‑light chain 3 (LC3) was assessed by western blotting. The effects of Z‑VAD‑fmk (a pan‑caspase inhibitor) and SP600125 (a JNK inhibitor) on the viability of the sodium formate‑induced 661W cells were determined using an MTT assay. Sodium formate treatment induced a decrease in the viability of the 661W cells in a time‑ and a dose‑dependent manner. In addition, sodium formate at concentrations of 15 or 30 mM markedly increased the level of apoptosis and the ROS levels, as measured by DCFH‑DA staining of the 661W cells. Additionally, 661W cells exposed to sodium formate for 24 h exhibited increased levels of p‑JNK, Bax, cleaved caspase‑3, cleaved caspase‑9 and LC3II (the phosphatidylethanolamine‑modified form of LC3), although the level of Bcl‑2 was decreased. Furthermore, cell cytotoxicity and autophagy were induced upon treatment with sodium formate. Z‑VAD‑fmk and SP600125 were able to effectively circumvent the effects of sodium formate on cell viability. These results suggested that the cytotoxicity induced by sodium formate induces the activation of the JNK signaling pathway, leading to caspase‑dependent apoptosis. Increased levels of autophagy were also observed during the process of 661W cell damage induced by sodium formate.
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Copy and paste a formatted citation
Spandidos Publications style
Wang Y, Xu SL, Xu WJ, Yang HY, Hu P and Li YX: Sodium formate induces autophagy and apoptosis via the JNK signaling pathway of photoreceptor cells. Mol Med Rep 13: 1111-1118, 2016.
APA
Wang, Y., Xu, S., Xu, W., Yang, H., Hu, P., & Li, Y. (2016). Sodium formate induces autophagy and apoptosis via the JNK signaling pathway of photoreceptor cells. Molecular Medicine Reports, 13, 1111-1118. https://doi.org/10.3892/mmr.2015.4675
MLA
Wang, Y., Xu, S., Xu, W., Yang, H., Hu, P., Li, Y."Sodium formate induces autophagy and apoptosis via the JNK signaling pathway of photoreceptor cells". Molecular Medicine Reports 13.2 (2016): 1111-1118.
Chicago
Wang, Y., Xu, S., Xu, W., Yang, H., Hu, P., Li, Y."Sodium formate induces autophagy and apoptosis via the JNK signaling pathway of photoreceptor cells". Molecular Medicine Reports 13, no. 2 (2016): 1111-1118. https://doi.org/10.3892/mmr.2015.4675
Copy and paste a formatted citation
x
Spandidos Publications style
Wang Y, Xu SL, Xu WJ, Yang HY, Hu P and Li YX: Sodium formate induces autophagy and apoptosis via the JNK signaling pathway of photoreceptor cells. Mol Med Rep 13: 1111-1118, 2016.
APA
Wang, Y., Xu, S., Xu, W., Yang, H., Hu, P., & Li, Y. (2016). Sodium formate induces autophagy and apoptosis via the JNK signaling pathway of photoreceptor cells. Molecular Medicine Reports, 13, 1111-1118. https://doi.org/10.3892/mmr.2015.4675
MLA
Wang, Y., Xu, S., Xu, W., Yang, H., Hu, P., Li, Y."Sodium formate induces autophagy and apoptosis via the JNK signaling pathway of photoreceptor cells". Molecular Medicine Reports 13.2 (2016): 1111-1118.
Chicago
Wang, Y., Xu, S., Xu, W., Yang, H., Hu, P., Li, Y."Sodium formate induces autophagy and apoptosis via the JNK signaling pathway of photoreceptor cells". Molecular Medicine Reports 13, no. 2 (2016): 1111-1118. https://doi.org/10.3892/mmr.2015.4675
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