{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nIn various cancer types, microRNA‐496 (miR-496) exhibits context-dependent regulatory functions. In lung adenocarcinoma, miR-496 suppresses the oncogenic long noncoding RNA DANCR via a RISC-dependent mechanism and modulates mTOR expression."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " In non-small cell lung cancer, increased miR-496 restrains cell proliferation by targeting brain-derived neurotrophic factor, thereby inactivating the PI3K/Akt signaling pathway."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": " In contrast, within colorectal cancer, miR-496 acts as an oncomiR by directly targeting the tumor suppressor RASSF6, which promotes cell migration and epithelial–mesenchymal transition via Wnt signaling."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": " In osteosarcoma, miR-496 is downregulated and its restoration suppresses proliferation, migration, and invasion by down-modulating eIF4E"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": "; similarly, in HPV-associated oropharyngeal squamous cell carcinoma, downregulation of miR-496 by the viral E6 oncoprotein perturbs the post-transcriptional control of E2F2."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": " In bladder cancer, miR-496 is sponged by the upregulated lncRNA NNT-AS1, leading to enhanced HMGB1 expression and aggressive tumor behavior"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": ", while in triple-negative breast cancer, low miR-496 levels contribute to elevated Del-1 expression and increased cell proliferation, migration, and invasion."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": " In lung invasive adenocarcinoma, reduced miR-496 expression correlates with higher levels of proliferative markers including eIF3h, Ki67, and Bcl-2, suggesting a tumor-suppressive role."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": " Finally, in hepatocellular carcinoma, a circular RNA (circ_0027791) sequesters miR-496, thereby releasing its target PDL1 from repression and promoting tumor progression."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn the cardiovascular and neuronal contexts, miR-496 also plays critical roles in modulating apoptosis and cell survival. In cerebral ischemia–reperfusion injury, miR-496 is downregulated, and its overexpression alleviates neuronal damage by inhibiting the pro-apoptotic factor BCL2L14."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": " In a myocardial ischemia–reperfusion model, upregulation of miR-496 protects cardiomyocytes by targeting Hook3 and subsequently activating the PI3K/Akt/mTOR pathway to enhance cell proliferation while reducing apoptosis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "11"}]}, {"type": "t", "text": " Conversely, in vascular endothelial cells, ox-LDL induces miR-496 expression, which silences the YAP gene and aggravates endothelial apoptosis and dysfunction."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "12"}]}, {"type": "t", "text": " In an ischemic stroke model, a competing endogenous RNA (circ_0007290) sponges miR-496; this derepression of PDCD4 leads to augmented neuronal injury, whereas restoring miR-496 levels confers neuroprotection."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "13"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAdditional studies highlight the epigenetic regulation and aging-related functions of miR-496. Methylated DNA binding protein 2 (MBD2) was shown to activate miR-496 expression via promoter demethylation, thereby enabling the repression of downstream target genes involved in proliferative pathways."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "14"}]}, {"type": "t", "text": " Moreover, miR-496 directly targets mTOR mRNA, and an inverse correlation between miR-496 levels and mTOR protein expression in peripheral blood mononuclear cells from elderly individuals points to a potential role in human lifespan modulation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "15"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nFinally, in inflammatory conditions such as rheumatoid arthritis, decreased miR-496 expression in synovial tissues and IL-1β-stimulated fibroblast-like synoviocytes leads to enhanced cell viability through upregulation of MMP10 and activation of the NF-κB signaling pathway; conversely, overexpression of miR-496 suppresses synoviocyte proliferation and promotes apoptosis, underscoring its potential as a therapeutic target."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "16"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Qing-Chun Lu, Zhuang-Hua Rui, Zhong-Liang Guo, et al. 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