{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n Long non‐coding RNA "}, {"type": "b", "children": [{"type": "t", "text": "ARAP1‐AS1"}]}, {"type": "t", "text": " has emerged as a critical regulator in a spectrum of pathological contexts including metabolic disorders and various cancers. In the setting of diabetes and diabetic nephropathy, circulating ARAP1‐AS1 levels progressively decline while its sense gene, ARAP1, is upregulated, suggesting an intricate regulatory axis with potential biomarker applications."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " In multiple malignancies, ARAP1‐AS1 is frequently overexpressed and its dysregulation correlates with aggressive tumor phenotypes and poor prognosis. For example, in bladder cancer ARAP1‐AS1 functions as a competing endogenous RNA (ceRNA) that sponges miR‐4735‑3p, thereby upregulating NOTCH2 to promote tumor progression."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": " Similarly, in breast cancer, ARAP1‐AS1 enhances HDAC2 expression via sequestration of miR‑2110, which in turn leads to the repression of the tumor suppressor PLIN1."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": " In cervical cancer, distinct studies have revealed that ARAP1‐AS1 exerts its oncogenic role by two mechanisms: one study showed that it recruits the chromatin modifier EZH2 to silence DUSP5"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": ", whereas another demonstrated that it sponges miR‑149‑3p to elevate POU2F2 expression."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": " Moreover, a separate investigation in cervical cancer identified a positive feedback loop in which ARAP1‐AS1 interacts with PSF to release PTB and enhance c‑Myc translation, thereby further fueling tumorigenesis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": " In clear cell renal cell carcinoma, ARAP1‐AS1 promotes malignancy via sponging miR‑361‑3p to upregulate PGF"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": ", while in gastric cancer, its overexpression is significantly associated with advanced disease stage and lymphatic metastasis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": " In ovarian cancer, ARAP1‐AS1 drives carcinogenicity by competitively binding miR‑4735‑3p to elevate the oncogene PLAGL2."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": " In lung adenocarcinoma, ARAP1‐AS1 facilitates cell proliferation and migration by recruiting EZH2 to repress ARAP1"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "11"}]}, {"type": "t", "text": ", and in a broader lung cancer context, its knockdown results in cell cycle arrest and decreased cyclin D1 expression."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "12"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Collectively, these findings indicate that ARAP1‐AS1 operates through diverse mechanisms—ranging from miRNA sponging to epigenetic modulation—to regulate critical oncogenic pathways. Its aberrant expression across various disease models not only underscores its multifaceted role in tumor progression and metabolic dysregulation but also highlights ARAP1‐AS1 as a promising diagnostic biomarker and therapeutic target.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Ying Yang, Xiaomeng Lv, Qiuling Fan, et al. 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