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Quinocetone triggered ER stress-induced autophagy via ATF6/DAPK1-modulated mAtg9a trafficking

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Abstract

The present study is undertaken to explore quinocetone-induced autophagy and its possible mechanism. Western blotting and green fluorescence protein (GFP)-LC3 vector transfection were performed to determine the ratio of LC3 conversion and its subcellular localization. Results revealed that the quinocetone induced autophagy in time- and dose-dependent manners. Besides, we tested the expressions of immunoglobulin heavy chain binding protein (BiP) and C/EBP homologous protein (CHOP) and the transcription of BiP, HerpUD, and sec24D by western blotting and RT-PCR, respectively. Results showed that quinocetone also induced endoplasmic reticulum (ER) stress during quinocetone-induced autophagy. Furthermore, we observed the cleavage of ATF6, the phosphorylation of MRLC, and the expression of death-associated protein kinase (DAPK1) by western blotting; the transcription of DAPK1 by RT-PCR; and the subcellular localization of ATF6 and mAtg9 by immunofluorescence. These results suggest that quinocetone stimulates the MRLC-mediated mAtg9 trafficking, which is critical for autophagosome formation, via the ATF6 upregulated expression of DAPK1. Last, we generated ATF6 and DAPK1 stable knockdown HepG2 cell lines and found that the conversion ratios of LC3 were decreased upon the treatment of quinocetone. Together, we propose that quinocetone induces autophagy through ER stress signaling pathway-induced cytoskeleton activation.

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Acknowledgments

This work was supported by National Nature Science Foundation of China (3172486).

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Authors and Affiliations

  1. Department of Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Yuanmingyuan West Road No. 2, Haidian District, Beijing, 100193, People’s Republic of China

    Yan Zhou, Shen Zhang, Chongshan Dai, Shusheng Tang, Xiayun Yang, Daowen Li, Kena Zhao & Xilong Xiao

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  1. Yan Zhou
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  2. Shen Zhang
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  3. Chongshan Dai
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Correspondence to Xilong Xiao.

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Zhou, Y., Zhang, S., Dai, C. et al. Quinocetone triggered ER stress-induced autophagy via ATF6/DAPK1-modulated mAtg9a trafficking. Cell Biol Toxicol 32, 141–152 (2016). https://doi.org/10.1007/s10565-016-9323-3

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