{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nLipocalin‐type prostaglandin D synthase (PTGDS) is a multifunctional enzyme that catalyzes the production of prostaglandin D₂ (PGD₂) from PGH₂ and thereby plays a pivotal role in modulating immune and inflammatory responses. For example, overexpression of PTGDS in experimental asthma models augments PGD₂ production, which in turn increases Th2 cytokine levels and promotes eosinophil and lymphocyte accumulation in the lung; moreover, genetic studies have identified PTGDS as a candidate risk gene in aggressive periodontitis, while dendritic cells and colonic tissues from inflammatory states such as ulcerative colitis display regulated PGD₂ synthesis that may affect local inflammatory cell functions and even modulate natural killer cell–mediated eosinophil clearance."}, {"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": "\nIn the central nervous system, PTGDS also fulfills neuroprotective and neuromodulatory functions. Acting not only as a key enzyme in the production of PGD₂ that regulates physiological sleep and may affect neural circuitry, PTGDS additionally serves as a chaperone able to bind amyloid‐β peptides and inhibit their aggregation—a function that is thought to protect against neurodegenerative processes such as Alzheimer’s disease. Furthermore, PTGDS expression is up‐regulated in response to oxidative stress and acute injury, and altered levels in cerebrospinal fluid have been linked to conditions ranging from neonatal hypoxic–ischemic encephalopathy to brain tumor pathologies."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "6", "end_ref": "16"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its roles in immune regulation and brain homeostasis, PTGDS—also known as beta‐trace protein—has emerged as an important biomarker in cardiovascular and renal physiology as well as in musculoskeletal health. Its serum levels correlate closely with glomerular filtration rate and have been used to predict coronary artery disease severity and assess residual renal function. In addition, studies in vascular endothelial cells have shown that shear stress can induce PTGDS expression, and genetic polymorphisms in the PTGDS gene have been linked to carotid atherosclerosis. Recent evidence further implicates PTGDS in adipogenesis, where its metabolites promote adipocyte differentiation, suggesting a role in metabolic syndrome as well as in the regulation of cartilage homeostasis relevant to osteoarthritic disease."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "17", "end_ref": "31"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition, deregulation of PTGDS has been implicated in various neoplastic and reproductive disorders. Aberrant expression levels have been reported in several tumor types—including ovarian carcinomas, diffuse large B‐cell lymphomas, lung and testicular cancers, and even in breast cancer where PTGDS signaling can suppress cell migration and invasion via interactions with proteins such as RIG1. Beyond its protumorigenic or tumor‐suppressive roles, PTGDS also interacts with the prostaglandin D₂ receptor to facilitate its intracellular trafficking, thereby modulating downstream GPCR signaling pathways that may ultimately affect cell proliferation and apoptosis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "32", "end_ref": "41"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Yasushi Fujitani, Yoshihide Kanaoka, Kosuke Aritake, et al. 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