Abstract
The endoplasmic reticulum (ER) is an intracellular organelle involved in biosynthesis and the secretory pathway. This organelle has many resident proteins including biosynthetic enzymes and secretory proteins. Recent studies have suggested that dysfunction of the ER or secretory pathway is involved in the pathogenesis of various human diseases. Some stresses acting on the ER, which are designated ER stress, induce the accumulation of unfolded/misfolded proteins in the ER, leading to cell death. Misfolded proteins are retained until they form their native conformation or returned to the cytosol for degradation by the proteasome. Among the ER-resident proteins, molecular chaperones prevent aggregation of proteins within the ER, and orchestrate the ER quality control systems. We have reported the roles of novel stress proteins, namely 150-kDa oxygen-regulated protein, 94-kDa glucose-regulated protein and RA410. These proteins are induced significantly by hypoxia or oxidative stress and have cytoprotective effects under these conditions. These findings suggest that hypoxia and oxidative stress target the ER and secretory pathway, resulting in ER stress, and that these proteins exert cytoprotective effects in various diseases associated with ER stress.
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Acknowledgments
I greatly thank Prof. Masaya Tohyama (Osaka University Graduate School of Medicine) and Dr. Satoshi Ogawa for their advice and valuable discussions. I also thank Profs. Shigetaka Yoshida (Asahikawa Medical University) and Taiichi Katayama (United Graduate School of Child Development, Osaka University, Kanazawa University and Hamamatsu University Graduate School of Medicine) for their helpful discussions. This work was supported in part by grants from the Ministry of Education, Culture, Sports, Science and Technology of Japan.
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The author reports no financial or any other conflicts of interest with the contents of the manuscript.
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Bando, Y. The functional role of stress proteins in ER stress mediated cell death. Anat Sci Int 87, 14–23 (2012). https://doi.org/10.1007/s12565-011-0127-5
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DOI: https://doi.org/10.1007/s12565-011-0127-5