biology Review Cell Death via Lipid Peroxidation and Protein Aggregation Diseases Katsuya Iuchi * , Tomoka Takai and Hisashi Hisatomi Department of Materials and Life Science, Faculty of Science and Technology, Seikei University, 3-3-1 Kichijojikitamachi, Musashino-shi, Tokyo 180-8633, Japan;
[email protected] (T.T.);
[email protected] (H.H.) * Correspondence:
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[email protected]; Tel.: +81-422-37-3523 Simple Summary: It is essential for cellular homeostasis that biomolecules, such as DNA, proteins, and lipids, function properly. Disturbance of redox homeostasis produces aberrant biomolecules, including oxidized lipids and misfolded proteins, which increase in cells. Aberrant biomolecules are removed by excellent cellular clearance systems. However, when excess aberrant biomolecules remain in the cell, they disrupt organelle and cellular functions, leading to cell death. These aberrant molecules aggregate and cause apoptotic and non-apoptotic cell death, leading to various protein aggregation diseases. Thus, we investigated the cell-death cross-linking between lipid peroxidation and protein aggregation. Abstract: Lipid peroxidation of cellular membranes is a complicated cellular event, and it is both the cause and result of various diseases, such as ischemia-reperfusion injury, neurodegenerative diseases, and atherosclerosis. Lipid peroxidation causes non-apoptotic cell death, which is associated with cell fate determination: survival or cell death. During the radical chain reaction of lipid peroxidation, Citation: Iuchi, K.; Takai, T.; various oxidized lipid products accumulate in cells, followed by organelle dysfunction and the Hisatomi, H. Cell Death via Lipid induction of non-apoptotic cell death. Highly reactive oxidized products from unsaturated fatty acids Peroxidation and Protein are detected under pathological conditions.