{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nmiR‑502, particularly its 5p and 3p species, has emerged as a multifunctional regulator in multiple cancers, acting mostly as a tumor suppressor in several contexts. In colon cancer, for example, miR‑502‑5p was shown to inhibit autophagy and cell proliferation by targeting key regulators such as Rab1B, with its expression being negatively regulated by p53—and its downregulation being associated with tumor progression."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " In breast, hepatocellular, ovarian, lung, and hematologic malignancies, genetic variants in the miR‑502 binding site of oncogenic targets like SET8 have been linked to altered protein levels, prognostic outcomes, and disease susceptibility."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "2", "end_ref": "11"}]}, {"type": "t", "text": " In these settings, miR‑502 exerts its antitumor functions by directly targeting oncogenes—including TRAF2, PIK3CG, and GINS2—thus inducing cell cycle arrest and apoptosis while suppressing proliferation and migration.\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nA second layer of regulation involves non‑coding RNA networks, wherein miR‑502 is sequestered by various circular and long non‑coding RNAs. In renal cell carcinoma, for instance, circ_001842 sponges miR‑502‑5p, leading to increased expression of SLC39A14 and enhanced tumor aggressiveness."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "12"}]}, {"type": "t", "text": " Similarly, overexpression of LINC00473 in invasive pituitary adenoma and circ‑SOX5 in hepatocellular carcinoma promotes tumor growth by reducing the available miR‑502‑3p pool and consequently upregulating oncogenic mediators such as KMT5A and SYVN1."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "13"}]}, {"type": "t", "text": " In acute myeloid leukemia, a similar mechanism involving circ_0003602 modulates the IGF1R pathway via miR‑502‑5p, and in liver hepatocellular carcinoma, lncRNA SNHG3 sustains cancer stem cell self‑renewal by repressing miR‑502‑3p and thereby altering ITGA6 regulatory circuits."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "15"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nContext‑dependent roles for miR‑502 have also been documented outside the classical tumor suppressor paradigm. In esophageal cancer, contrasting observations indicate that overexpression of miR‑502 can promote cell proliferation and reduce apoptosis—possibly via enhanced AKT pathway phosphorylation"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "16"}]}, {"type": "t", "text": "—underscoring its context‑specific functionality. In neurological injury models, miR‑502‑5p modulates apoptosis and inflammatory responses by targeting CDKN1B and influencing the PPARγ/NF‑κB pathway after subarachnoid hemorrhage."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "17"}]}, {"type": "t", "text": " In inflammatory and degenerative conditions, such as tuberculosis and osteoarthritis, miR‑502‑3p acts as an anti‑inflammatory agent by targeting ROCK1, and its sequestration by circ_0032131 or alterations in its serum levels—as seen in osteoporotic fracture patients—further highlights its potential as a diagnostic and therapeutic marker."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "19", "end_ref": "21"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "H Zhai, B Song, X Xu, et al. 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