{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nPDLIM2 is a multifunctional adaptor protein that plays a critical role in regulating transcription factor activity. In several cell types, it functions as a nuclear ubiquitin E3 ligase that targets the p65 subunit of NF‐κB, thereby terminating NF‐κB activation and restraining inflammatory responses. This regulation occurs via direct binding and polyubiquitination of p65, leading to its sequestration in specific intranuclear compartments and subsequent proteasomal degradation. In addition, epigenetic mechanisms—such as promoter methylation and alternative splicing—affect PDLIM2 expression and localization, contributing to aberrantly sustained NF‐κB and related transcription factor activities in conditions including virus‐associated malignancies and breast cancer."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "9"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its nuclear functions, PDLIM2 is intimately involved in the regulation of cytoskeletal dynamics, cell adhesion, and migration. In epithelial and other cell types, distinct alternatively spliced isoforms (such as Mystique) are localized to cytoskeletal focal contacts and interact with proteins like α‐actinin and β1‐integrin, thereby enhancing cell adhesion and regulating migratory capacity. Such cytoskeletal functions are pivotal in maintaining epithelial polarity, modulating epithelial‐to‐mesenchymal transition (EMT), and controlling cell motility—a process highlighted in studies addressing breast epithelial acini formation, podocyte actin dynamics, and even in the context of prostate, ovarian, and gastric cancers. Moreover, these roles have been further illuminated by proteomic and pull‐down analyses that map a broad interactome for PDLIM2, revealing its integration within adhesion complexes and signaling pathways, including responses to TGF‐β/Smad modulation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "10", "end_ref": "21"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its cell-intrinsic functions, dysregulation of PDLIM2 is closely associated with cancer pathogenesis and holds significant clinical promise. In multiple tumor types—including triple‐negative breast cancer, esophageal squamous cell carcinoma, lung cancer, and across a pan‐cancer spectrum—loss or epigenetic repression of PDLIM2 correlates with heightened NF‐κB, STAT, and β‐catenin signaling, poorer prognosis, and resistance to conventional therapies such as anti–PD-1 and chemotherapy. In some contexts, restoration of PDLIM2 expression is sufficient to reverse malignant phenotypes by enhancing antigen presentation, curtailing multidrug resistance, or even counteracting microbial traversal of the blood–brain barrier, thereby opening new avenues for targeted treatment strategies."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "22", "end_ref": "27"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Takashi Tanaka, Michael J Grusby, Tsuneyasu Kaisho "}, {"type": "b", "children": [{"type": "t", "text": "PDLIM2-mediated termination of transcription factor NF-kappaB activation by intranuclear sequestration and degradation of the p65 subunit."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Nat Immunol (2007)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1038/ni1464"}], "href": "https://doi.org/10.1038/ni1464"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "17468759"}], "href": "https://pubmed.ncbi.nlm.nih.gov/17468759"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Nollaig C Healy, Rosemary O'Connor "}, {"type": "b", "children": [{"type": "t", "text": "Sequestration of PDLIM2 in the cytoplasm of monocytic/macrophage cells is associated with adhesion and increased nuclear activity of NF-kappaB."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Leukoc Biol (2009)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1189/jlb.0408238"}], "href": "https://doi.org/10.1189/jlb.0408238"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "19052146"}], "href": "https://pubmed.ncbi.nlm.nih.gov/19052146"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Pengrong Yan, Zhaoxia Qu, Chie Ishikawa, et al. 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