Abstract
The protein of p62/sequestosome 1 (SQSTM1), a key cargo adaptor protein involved in autophagy–lysosome degradation, exhibits inclusion bodies structure in cytoplasm and plays a protective role in some models of neurodegenerative diseases. Some PrP mutants, such as PrP-CYTO and PrP-PG14, also form cytosolic inclusion bodies and trigger neuronal apoptosis either in cultured cells or in transgenic mice. Here, we demonstrated that the cellular p62/SQSTM1 incorporated into the inclusion bodies formed by expressing the abnormal PrP mutants, PrP-CYTO and PrP-PG14, in human embryonic kidney 293 cells. Overexpression of p62/SQSTM1 efficiently relieved the cytosolic aggregations and cell apoptosis induced by the abnormal PrPs. Autophagy–lysosome inhibitors instead of proteasome inhibitor sufficiently blocked the p62/SQSTM1-mediated degradations of abnormal PrPs. Overexpression of p62/SQSTM1 did not alter the levels of light chain 3 (LC3) in the cells expressing various PrPs. However, more complexes of p62/SQSTM1 with LC3 were detected in the cells expressing the misfolded PrPs. These data imply that p62/SQSTM1 plays an important role in the homeostasis of abnormal PrPs via autophagy–lysosome-dependent way.
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Acknowledgments
This work was supported by Chinese National Natural Science Foundation Grant (81100980, 81101302 and 31100117), China Mega-Project for Infectious Disease (2011ZX10004-101, 2012ZX10004215) and SKLID Development Grant (2012SKLID102, 2011SKLID302, 2011SKLID204, 2011SKLID211).
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Xu, Y., Zhang, J., Tian, C. et al. Overexpression of p62/SQSTM1 promotes the degradations of abnormally accumulated PrP mutants in cytoplasm and relieves the associated cytotoxicities via autophagy–lysosome-dependent way. Med Microbiol Immunol 203, 73–84 (2014). https://doi.org/10.1007/s00430-013-0316-z
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DOI: https://doi.org/10.1007/s00430-013-0316-z