{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nNeuronal pentraxin 1 (NPTX1) is a secreted protein that plays central roles in synaptic remodeling and neuronal health. In the context of Alzheimer’s disease, amyloid‐β exposure leads to a marked increase in NPTX1 levels in cortical neurons, an event that precedes synaptic loss, neurite damage, and apoptotic death. In human Alzheimer brains and transgenic mouse models, NPTX1 colocalizes with tau deposits and presynaptic markers, suggesting that its upregulation contributes to excitatory synaptic pathology. In addition, soluble NPTX1 species released upon amyloid‐β stimulation have been proposed as potential plasma biomarkers to monitor early synaptic dysfunction, and aberrant NPTX1 expression has also been implicated in the synaptic pathology observed in Parkinson’s disease models."}, {"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 roles in the central nervous system, NPTX1 functions as a tumor suppressor in several malignancies. In colon cancer, NPTX1 expression is downregulated and its ectopic overexpression inhibits cell proliferation by reducing levels of key cell cycle regulators. Similar antitumor effects have been demonstrated in hepatocellular carcinoma, where NPTX1 promotes mitochondria‐mediated apoptosis via modulation of the AKT pathway. Moreover, in head and neck squamous cell carcinoma, NPTX1 is directly targeted by miR-4295; suppression of miR-4295 restores NPTX1 levels and thereby limits cell proliferation and epithelial–mesenchymal transition. Although detectable in a subset of small cell lung cancer cell lines, levels of NPTX1 do not correlate with toxin sensitivity, suggesting that its impact in oncogenesis may be context dependent."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "4", "end_ref": "7"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nGenetic studies and investigations into the regulatory mechanisms of NPTX1 further emphasize its multifaceted biological functions. Missense variants in NPTX1 have been identified in families with autosomal dominant cerebellar ataxia; these mutations disrupt normal protein complex formation and induce endoplasmic reticulum stress, thereby contributing to neurodegeneration. Moreover, the promoter region of the human NPTX1 gene harbors hypoxia response elements that mediate transcriptional activation under low oxygen conditions, while activation of the aryl hydrocarbon receptor (AhR) in chronic kidney disease upregulates NPTX1 expression in vascular tissues. These findings underscore the role of NPTX1 not only in synaptic physiology but also in mediating cellular responses to environmental and genetic stress."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "8", "end_ref": "10"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Maria A Abad, Marta Enguita, Nuria DeGregorio-Rocasolano, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "NPTX1 inhibits colon cancer cell proliferation through down-regulating cyclin A2 and CDK2 expression."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Cell Biol Int (2018)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1002/cbin.10935"}], "href": "https://doi.org/10.1002/cbin.10935"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "29345391"}], "href": "https://pubmed.ncbi.nlm.nih.gov/29345391"}]}, {"type": "r", "ref": 6, "children": [{"type": "t", "text": "Yue Zhao, Yaqi Yu, Wenxiu Zhao, et al. 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