{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nNOL3, which encodes the apoptosis repressor with caspase recruitment domain (ARC), is a multifunctional inhibitor of programmed cell death. ARC directly interferes with both the extrinsic (death receptor–dependent) and intrinsic (mitochondrial/ER‐dependent) apoptotic pathways by engaging in noncanonical interactions with death‐fold proteins such as Fas, FADD, and Bax, and by modulating caspase‐8 activation through a calcium‐binding mechanism. In addition, ARC binds to the tetramerization domain of p53, thereby preventing p53 assembly and attenuating the transcriptional activation of its pro‐apoptotic targets."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "5"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn a variety of human malignancies—including cancers of the breast, colon, nasopharynx, kidney, and hematopoietic system—ARC is often aberrantly overexpressed. This increased ARC abundance contributes to resistance against chemotherapeutic agents and ionizing radiation, supports tumor growth, invasion, metastasis, and is associated with poor clinical outcomes. In some instances, ARC shows an altered subcellular distribution (for example, shifting from a predominantly cytoplasmic localization in normal cells to nuclear accumulation in cancer cells), and its expression can be modulated by microRNAs such as miR‐185, which enhance chemosensitivity by targeting ARC."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "6", "end_ref": "15"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its oncogenic implications, ARC plays critical physiological roles in terminally differentiated tissues such as cardiac myocytes and neurons. In cardiomyocytes, ARC inhibits voltage‐gated K⁺ channels, thereby modulating cellular ion homeostasis and protecting against apoptosis induced by various stressors. ARC protein levels are dynamically regulated in response to apoptotic triggers via enhanced ubiquitin–proteasomal degradation, and its phosphorylation state may differentially influence cell sensitivity to oxidative stress. Moreover, ARC has been implicated in the regulation of vascular smooth muscle cell phenotypes, in the maintenance of hematopoietic homeostasis—with deletion of Nol3 provoking a myeloproliferative neoplasm—and in inflammatory conditions such as inflammatory bowel disease, where ARC modulates NF‐κB signaling. ARC activity is also associated with the formation of colonic adenomas in familial adenomatous polyposis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "16", "end_ref": "22"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nUpstream signaling pathways intricately regulate ARC expression and function. Oncogenic Ras signaling, for instance, promotes ARC transcription and stabilizes ARC protein by suppressing its polyubiquitination, thereby enhancing cell survival and cell cycle progression. Hypoxic conditions also stimulate ARC expression via HIF‐1, further contributing to cellular resistance against apoptosis—such as that induced by TRAIL—and reinforcing the multifaceted role of ARC as a molecular switch in the balance between survival and death."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "23"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Young-Jae Nam, Kartik Mani, Anthony W Ashton, et al. 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