{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nPeroxiredoxin 6 (PRDX6) is a unique, bifunctional antioxidant enzyme that harbors both glutathione‐dependent peroxidase activity and Ca²⁺–independent phospholipase A₂ (PLA₂) activity—with an additional lysophosphatidylcholine acyl transferase function—enabling it to reduce H₂O₂ and a broad spectrum of hydroperoxides (including peroxidized membrane lipids) as well as to participate actively in phospholipid turnover and membrane repair. Its catalytic cycle depends on the oxidation of a single conserved cysteine residue and requires recycling via glutathionylation (mediated by πGST), and crystallographic as well as biophysical studies have revealed that its structure (in both the reduced and sulfinic acid forms) is fundamental to its multifunctional roles."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "5"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nPRDX6’s enzymatic activities are finely tuned by post‐translational modifications and subcellular localization. Phosphorylation by mitogen‐activated protein kinases (MAPKs) and related pathways markedly enhances its PLA₂ activity (without affecting peroxidase function), while hyperoxidation under high oxidant loads can irreversibly alter its catalytic status and even trigger cell cycle arrest via a surge in PLA₂ activity. Its transcription is regulated by antioxidant‐response elements bound by Nrf2, and a novel N‐terminal peptide motif (aided by binding of chaperone proteins such as 14–3–3ε) directs the enzyme to acidic compartments like lamellar bodies and lysosomes—localizations that are critical for its role in lung surfactant metabolism and the repair of peroxidized cellular membranes."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "6", "end_ref": "9"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its core biochemical functions, PRDX6 plays critical roles in diverse pathophysiological settings. In the central nervous system and ocular tissues—including brain, retinal pigment epithelium, and lens epithelial cells—PRDX6 supports antioxidant defenses that counteract oxidative stress associated with neurodegeneration, Alzheimer’s disease and cataract formation. Moreover, its protective capacity extends to reproductive contexts where it preserves sperm motility and DNA integrity. In contrast, aberrant PRDX6 expression or activity is linked to cancer progression (in breast, lung, colon, melanoma and hepatocellular carcinoma among others) by supporting tumor cell growth, invasiveness, metastasis, and chemoresistance—effects mediated through both its peroxidase function (which aids in maintaining redox homeostasis and cell growth) and its PLA₂ activity (which generates arachidonic acid to activate signaling cascades such as p38 kinase, PI3K/Akt, and NF‐κB pathways). Additionally, PRDX6 modulates NADPH oxidase activity, influencing inflammatory responses in neutrophils and epithelial wound healing, and its dysregulation has been associated with drug resistance."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "10", "end_ref": "31"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nMechanistically, PRDX6 operates at the crossroads of redox regulation and lipid signaling. Its interaction with πGST is essential for the regeneration of peroxidase activity after catalytic oxidation, while binding to key signaling intermediates—including components of the NADPH oxidase complex, TRAF6‐ECSIT and caspase death effector domains—not only modulates superoxide generation and inflammatory pathways (such as NF‐κB and toll–like receptor 4 signaling) but also impacts cell survival versus apoptotic fate. Furthermore, phosphorylation‐induced conformational changes (exemplified by a transition toward a molten globule state that enhances lipid binding) and precise subcellular localization underscore its role as an integrator of cellular stress responses. These multifaceted regulatory features of PRDX6 highlight its potential as a therapeutic target in pathologies ranging from chronic inflammation and neurodegeneration to cancer and traumatic injury."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "32", "end_ref": "37"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Yefim Manevich, Aron B Fisher "}, {"type": "b", "children": [{"type": "t", "text": "Peroxiredoxin 6, a 1-Cys peroxiredoxin, functions in antioxidant defense and lung phospholipid metabolism."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Free Radic Biol Med (2005)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.freeradbiomed.2005.02.011"}], "href": "https://doi.org/10.1016/j.freeradbiomed.2005.02.011"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "15890616"}], "href": "https://pubmed.ncbi.nlm.nih.gov/15890616"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Yefim Manevich, Tom Sweitzer, Jhang Ho Pak, et al. 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