{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nNeuropeptide S (NPS) is an endogenous modulator with profound effects on central nervous system functions. It has been shown to stimulate arousal and decrease anxiety while promoting wakefulness. When administered into the brain ventricles or specific hypothalamic nuclei, NPS activates the hypothalamo‐pituitary–adrenal (HPA) axis—elevating ACTH and corticosterone levels—and acutely alters behaviors such as locomotion, rearing, feeding, and pain processing. Structure–activity studies have identified critical amino acid residues essential for receptor activation, and pharmacological investigations indicate that NPS can exert analgesic effects partly via dopaminergic (D2‐like) receptor signaling. Furthermore, its role in regulating sleep–wakefulness and sympathetic outflow underscores its importance in maintaining behavioral and neuroendocrine homeostasis."}, {"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": "\nBeyond its central neural roles, the NPS system is increasingly recognized for its impact on immune and inflammatory processes. Genetic studies have linked mutations in NPS and its receptor to altered signal transduction, which in turn affect airway remodeling and asthma susceptibility. Experimental evidence demonstrates that NPS can up-regulate key downstream targets in epithelial cells, stimulate chemotaxis in human monocytes, and that naturally occurring variants of NPS modulate its bioactivity—findings that collectively underscore the peptide’s relevance in inflammatory diseases and immune regulation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "8", "end_ref": "13"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its roles in the brain and immune tissues, NPS may influence peripheral processes. Recent studies in endometriotic epithelial cells have revealed that NPS promotes cell invasiveness and actin cytoskeletal remodeling via pathways dependent on sphingosine 1-phosphate signaling and downstream RhoA/Rho kinase activation. This finding broadens the spectrum of NPS function to include modulation of cellular behavior in reproductive tissues."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "14"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Kirsty L Smith, Michael Patterson, Waljit S Dhillo, et al. 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