{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nPleiotrophin (PTN) is a multifunctional, heparin‐binding cytokine that modulates cell growth, differentiation, and migration via interactions with specific cell surface receptors. Structural and mechanistic studies have revealed that PTN engages receptors such as the anaplastic lymphoma kinase (ALK) and receptor protein tyrosine phosphatase β/ζ through defined chondroitin sulfate moieties that control receptor oligomerization and subsequent activation of key signaling cascades. Detailed analyses and reviews have emphasized that this ligand–receptor interplay is critical in controlling downstream pathways involved in survival and cytoskeletal remodeling."}, {"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": "\nIn several human cancers, PTN acts as a potent promoter of tumor progression and microenvironmental remodeling. In glioblastomas, for example, studies have shown that PTN is secreted by tumor‐associated macrophages or by the tumor cells themselves; its paracrine action via receptors such as ALK and protein tyrosine phosphatase receptor zeta (PTPRZ1) supports glioma stem cell maintenance and enhances invasive behavior. Moreover, distinct naturally occurring isoforms of PTN have been found to differentially regulate tumor cell proliferation (via an ALK‐dependent mechanism) versus migration (via a PTPRZ1‐dependent mechanism) in glioblastoma, while PTN overexpression in breast, prostate, lung, ovarian, and hepatitis B virus–associated hepatocellular carcinomas correlates with enhanced cell proliferation, angiogenesis, and poor patient prognosis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "7", "end_ref": "18"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nPTN also exerts significant neurotrophic and developmental functions. It promotes neuronal survival and neurite outgrowth in models of peripheral nerve injury and in the developing nigrostriatal system, thereby contributing to motor and dopaminergic neuron resilience. Furthermore, secretion of PTN by specialized natural killer cell subsets at the maternal–fetal interface underlies its role as a growth‐promoting factor during early pregnancy, while PTN released by feeder cells supports the propagation and survival of human embryonic stem cells."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "19", "end_ref": "22"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its roles in cancer and neural development, PTN contributes to diverse physiological processes. In the skin, PTN secreted by fibroblasts promotes keratinocyte proliferation, supporting wound repair. PTN can also interfere with viral infections by inhibiting particle attachment at the cell surface and exhibits antibacterial activity via membrane disruption. 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