{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nMicroRNA‐889 (miR‐889) is emerging as a multifaceted regulator with context‐dependent roles in tumorigenesis and cellular differentiation. In esophageal squamous cell carcinoma, for example, miR‐889 overexpression accelerates cell cycle progression and proliferation by directly targeting the tumor suppressor DAB2IP, indicating an oncogenic function."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " Its aberrant expression has also been associated with colorectal cancer progression"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": "and hepatocellular carcinoma prognosis"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": ", thereby underscoring its potential utility as a diagnostic and prognostic biomarker.\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its direct impact on cell proliferation, miR‐889 is deeply integrated into complex noncoding RNA networks that modulate tumor behavior. In cervical cancer, the long noncoding RNA XIST sequesters miR‐889‑3p to relieve repression of SIX1, while a circular RNA—hsa_circ_0009035—acts as a competing endogenous sponge for miR‐889‑3p to regulate HOXB7 expression; both mechanisms result in modulation of proliferation, migration, invasion, and radioresistance."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": " In breast cancer, miR‐889‑3p targets Kruppel‐like factor 9 (KLF9), with its activity antagonized by lncRNA MBNL1‑AS1, leading to altered cell invasion, migration, and glycolysis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": " Likewise, in osteosarcoma, circ_0078767 and circ_0002669 integrate miR‐889 into regulatory axes controlling the expression of KLF9 and MYCBP respectively, thereby influencing cell growth, migration, epithelial–mesenchymal transition, and apoptosis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nConversely, tumor‐suppressive functions of miR‐889 have been observed in several malignancies. In non‐small cell lung cancer, enforced miR‐889 expression curtails proliferation and invasiveness through direct targeting of TAB1"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": ", while in another lung cancer study, upregulation of miR‐889 restrains epithelial–mesenchymal transition and promotes apoptosis by targeting HIPK1."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": " Moreover, in pancreatic ductal adenocarcinoma, exosomal lncRNA NNT‑AS1 modulates the miR‐889‑3p/HIF‑1α axis, leading to changes in glucose metabolism, proliferation, and metastatic potential."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "11"}]}, {"type": "t", "text": " Notably, miR‐889 also regulates the osteogenic differentiation of bone marrow mesenchymal stem cells, highlighting its broader biological relevance beyond oncogenesis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "12"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Yanting Xu, Jiangtu He, Yue Wang, et al. 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