{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nMIR181B2 – one member of the miR‐181b family – exerts multifaceted roles in diverse biological processes. In the immune system, MIR181B2 is involved in the regulation of lymphocyte development and innate immune responses. In human natural killer cells, for example, transcripts derived from the MIR181A2B2 cluster are upregulated during differentiation, suggesting that MIR181B2 participates in shaping the lymphocyte repertoire and functional maturation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " In lower vertebrates, a homolog designated miR‐181b‐2 acts as a negative feedback regulator during bacterial and viral challenges by targeting key adaptor molecules such as TRIF and thereby dampening NF‑κB and IRF3 signaling."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": " In addition, altered MIR181B2 expression has been linked with inflammatory conditions such as pulpitis, indicating that proper regulation of this microRNA is critical for balancing inflammatory responses."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn various malignancies, MIR181B2 displays context‐dependent functions that can either promote or suppress tumor progression. In certain cancers including osteosarcoma and cholangiocarcinoma, upregulation of MIR181B2 (often investigated as miR‐181b‐5p) can drive oncogenic traits by repressing tumor suppressors such as PTEN and PARK2, activating proliferative and pro‑survival PI3K/AKT signaling cascades."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": " In prostate cancer cells, MIR181B2 overexpression correlates with increased cell proliferation and invasion, while its inhibition triggers apoptosis and suppresses tumor cell growth."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": " In hematological malignancies such as acute myeloid leukemia and chronic lymphocytic leukemia, aberrant MIR181B2 levels have been associated with disease progression and prognosis, with elevated levels contributing to cell cycle progression through downregulation of specific targets like MLK2 and links to adverse clinical features."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "7", "end_ref": "9"}]}, {"type": "t", "text": " Furthermore, in conditions such as calcific aortic valve disease and psoriasis, altered MIR181B2 expression modulates extracellular matrix remodeling or keratinocyte proliferation, respectively, by regulating key genes in the TIMP and Akt/mTOR pathways."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "10", "end_ref": "12"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its roles in immunity and oncogenesis, MIR181B2 also influences other cellular processes such as metabolism and cell motility. In hepatocytes, MIR181B2 (assayed as miR‐181b‐5p) has been implicated in the regulation of hepatic glycogen synthesis, suggesting a potential involvement in insulin signaling and metabolic homeostasis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "13"}]}, {"type": "t", "text": " In trophoblasts, overexpression of MIR181B2 impairs cell migration and invasion via direct targeting of S1PR1, highlighting its possible contribution to placentation and pregnancy maintenance."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "14"}]}, {"type": "t", "text": " Finally, studies in other tumor types, including analyses in hyperplastic polyps and anaplastic large cell lymphoma, further support the notion that dysregulation of MIR181B2 has significant diagnostic and prognostic implications in human disease."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "15", "end_ref": "17"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Steven R Presnell, Ahmad Al-Attar, Frank Cichocki, et al. 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