{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nMelanotransferrin (MELTF), also known as melanoma tumor antigen p97, is a glycosylphosphatidylinositol‐anchored transferrin homolog that, despite sharing a high-affinity iron‐binding site with serum transferrin, plays a minimal role in traditional iron uptake. Instead, experimental models demonstrate that MELTF is intimately involved in the regulation of cell proliferation and tumorigenesis—especially in melanoma—where its down‐regulation inhibits both cellular growth and migration while altering the expression of genes associated with proliferation and differentiation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "6"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBoth membrane-bound and soluble forms of MELTF display distinct functional characteristics. The soluble form appears to deliver iron inefficiently via nonspecific internalization and subsequent degradation, whereas the membrane-bound protein has been shown to interact with components of the plasminogen activation system. These interactions—with ligands such as pro–urokinase plasminogen activator and plasminogen, and receptors including low-density lipoprotein receptor–related protein and annexin II—enhance plasmin generation and promote extracellular matrix degradation, thereby facilitating cell migration, invasion, and angiogenesis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "7", "end_ref": "9"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nFurther evidence from gene modulation studies reinforces MELTF’s multifaceted role. In melanoma and other cell models, down‐regulation of MELTF leads to reduced proliferation and impaired migratory and invasive capacities, while its enhanced expression is associated with tumor progression. In addition, altered MELTF expression has clinical implications—it has been proposed as a potential biomarker for early colorectal cancer detection, and its role in stem cell differentiation (notably in mesenchymal stem cells where downregulation correlates with enhanced osteogenesis and lipid accumulation during adipogenesis) suggests broader physiological functions. Notably, while serum levels remain unchanged in neurodegenerative conditions such as Alzheimer’s disease, the context-specific modulation of MELTF in tumorigenesis underscores its potential as a diagnostic marker and therapeutic target."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "10", "end_ref": "12"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Michael R Food, Eric O Sekyere, Des R Richardson "}, {"type": "b", "children": [{"type": "t", "text": "The soluble form of the membrane-bound transferrin homologue, melanotransferrin, inefficiently donates iron to cells via nonspecific internalization and degradation of the protein."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Eur J Biochem (2002)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1046/j.1432-1033.2002.03140.x"}], "href": "https://doi.org/10.1046/j.1432-1033.2002.03140.x"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "12230555"}], "href": "https://pubmed.ncbi.nlm.nih.gov/12230555"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "E O Sekyere, L L Dunn, D R Richardson "}, {"type": "b", "children": [{"type": "t", "text": "Examination of the distribution of the transferrin homologue, melanotransferrin (tumour antigen p97), in mouse and human."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Biochim Biophys Acta (2005)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.bbagen.2004.12.002"}], "href": "https://doi.org/10.1016/j.bbagen.2004.12.002"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "15716025"}], "href": "https://pubmed.ncbi.nlm.nih.gov/15716025"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "L L Dunn, E O Sekyere, Y Suryo Rahmanto, et al. "}, {"type": "b", "children": [{"type": "t", "text": "The function of melanotransferrin: a role in melanoma cell proliferation and tumorigenesis."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Carcinogenesis (2006)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1093/carcin/bgl045"}], "href": "https://doi.org/10.1093/carcin/bgl045"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "16704991"}], "href": "https://pubmed.ncbi.nlm.nih.gov/16704991"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "Y Suryo Rahmanto, L L Dunn, D R Richardson "}, {"type": "b", "children": [{"type": "t", "text": "Identification of distinct changes in gene expression after modulation of melanoma tumor antigen p97 (melanotransferrin) in multiple models in vitro and in vivo."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Carcinogenesis (2007)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1093/carcin/bgm096"}], "href": "https://doi.org/10.1093/carcin/bgm096"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "17449903"}], "href": "https://pubmed.ncbi.nlm.nih.gov/17449903"}]}, {"type": "r", "ref": 5, "children": [{"type": "t", "text": "Y Suryo Rahmanto, L L Dunn, D R Richardson "}, {"type": "b", "children": [{"type": "t", "text": "The melanoma tumor antigen, melanotransferrin (p97): a 25-year hallmark--from iron metabolism to tumorigenesis."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Oncogene (2007)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1038/sj.onc.1210442"}], "href": "https://doi.org/10.1038/sj.onc.1210442"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "17452986"}], "href": "https://pubmed.ncbi.nlm.nih.gov/17452986"}]}, {"type": "r", "ref": 6, "children": [{"type": "t", "text": "Sebastien Farnaud, Maryam Amini, Chiara Rapisarda, et al. 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