{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nMicrosomal glutathione S‐transferase 1 (MGST1) is a membrane‐associated enzyme belonging to the MAPEG superfamily that catalyzes the conjugation of glutathione to electrophilic substrates and helps detoxify reactive compounds. Its basal expression is tightly regulated by transcription factors (e.g., Sp1), and detailed single nucleotide polymorphism mapping has provided a foundation for pharmacogenetic studies as well as associations with disease risk, including reports linking MGST1 polymorphisms to colorectal cancer susceptibility."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "3"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its basal detoxification functions, MGST1 plays an important role in protecting cells and their mitochondria against oxidative stress. For example, in hematopoietic stem cells MGST1 expression increases with age—a potential compensatory response to the accumulation of oxidative damage—while overexpression of MGST1 in other cell systems confers resistance to lipid peroxidation and cytotoxic agents such as cisplatin. This cytoprotective effect is partly achieved through its glutathione peroxidase activity and is enhanced by antioxidants like vitamin E."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nMGST1 also exhibits unique kinetic and regulatory properties—including a dynamic equilibrium between high‐ and low‐activity forms with one‐third-of‐the‐sites reactivity—that enable its rapid activation under conditions of oxidative stress. Intriguingly, certain tumors show distinct patterns of MGST1 expression and function: its absence in neuroblastoma cells correlates with an enhanced sensitivity to oxidative injury, while in lung adenocarcinoma, its activity appears to contribute to drug resistance. Moreover, in cancers such as pancreatic and gastric carcinomas, MGST1 has been implicated in inhibiting ferroptosis—a regulated form of cell death driven by lipid peroxidation—and in melanoma, it participates in melanin biosynthetic pathways that help mitigate oxidative stress and may affect tumor progression."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "6", "end_ref": "10"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "A Iida, S Saito, A Sekine, et al. 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