{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nThe pre‐pronociceptin gene (PNOC) encodes the neuropeptide nociceptin/orphanin FQ, which, despite its sequence similarity to classical opioids, modulates a broad range of neural and immune functions. In central nervous system tissues, nociceptin contributes to the regulation of memory, locomotion, pain processing, neurotransmitter release, and the activation of intracellular pathways such as protein phosphorylation and NF‑κB signaling. In parallel, peripheral immune cells—including neutrophils and mononuclear cells—express PNOC, and their secreted nociceptin modulates early immune responses and inflammatory mediator release through effects on cellular cyclic AMP levels."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "7"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nGenetic and expression studies further suggest that PNOC is implicated in neurobehavioral domains such as addiction and stress regulation. For example, studies in alcohol‐dependent individuals indicate that chronic ethanol exposure is associated with downregulation of PNOC mRNA in the hippocampus, potentially impairing cognitive control over alcohol seeking. Meanwhile, investigations into single nucleotide polymorphisms have yielded mixed results regarding associations of PNOC variants with neonatal abstinence syndrome, opioid dependence, and schizophrenia. Moreover, nociceptin signaling influences the hypothalamo–pituitary–adrenal axis and modulates NF‑κB activity, patterns that have been correlated with altered stress responses, depressed mood, and even suicide."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "8", "end_ref": "18"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its roles in the central nervous system, PNOC‐derived nociceptin also exerts important peripheral effects. It modulates reproductive processes by participating in ovarian hormone feedback loops, regulating meiotic chromosome dynamics during spermatogenesis, and influencing uterine contractility—actions that may contribute to conditions such as dysmenorrhea and adenomyosis. Likewise, nociceptin is expressed in vascular tissues such as the human umbilical cord, where it likely participates in the local regulation of vascular tone, and its circulating levels change in cardiovascular conditions like unstable angina and even Wilson’s disease. In addition, preliminary studies have explored its expression in the context of tumor biology and immune cell infiltration, further broadening the spectrum of PNOC function."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "19", "end_ref": "29"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "E Blaveri, G Kalsi, J Lawrence, et al. 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