{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nNR4A2 (Nurr1) is a ligand‐independent orphan nuclear receptor that plays a pivotal role in central nervous system development and maintenance. It is indispensable for the differentiation and survival of midbrain dopaminergic neurons, in part through direct transactivation of key genes such as tyrosine hydroxylase that define the dopamine phenotype. Reduced NR4A2 expression, as well as rare coding mutations, have been associated with Parkinson’s disease and other neurodegenerative conditions, while experimental ablation or dysfunction of NR4A2 in animal models leads to loss of striatal dopamine, degeneration of dopaminergic markers, and neuronal demise. Cooperative interactions with other transcription factors such as Pitx3 and Foxa2 further underscore its critical role in both early neuronal specification and the adult maintenance of dopaminergic circuitry."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "20"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its critical functions in the brain, NR4A2 is rapidly inducible by diverse inflammatory and stress‐related signals in peripheral cells. In macrophages, synoviocytes, vascular smooth muscle cells and other lineages, NR4A2 modulates inflammatory gene expression and promotes phenotypic changes that impact immune responses and tissue remodeling. Its dysregulation has been implicated in several cancers where NR4A2 can influence cell proliferation, apoptosis and migration—in some settings contributing to tumor survival, and in others, acting in an anti‐proliferative capacity. Moreover, NR4A2 activity interconnects with key signaling pathways (including NF‑κB, CREB, and kinase cascades) in processes such as restenosis, alternative macrophage polarization, and even the cellular response to oxidative stress, thereby influencing both inflammatory joint disease and vascular pathology."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "21", "end_ref": "38"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAt the mechanistic level, NR4A2 displays unique regulatory features that distinguish it from classical nuclear receptors. Crystallographic and biochemical studies reveal that its ligand‐binding domain possesses a canonical fold yet is characterized by a tightly packed structure lacking a conventional ligand pocket—although unsaturated fatty acids such as docosahexaenoic acid have been shown to interact with and modulate NR4A2 activity. In parallel, its intracellular trafficking is governed by defined nuclear import and export signals, and its transcriptional output is further fine‐tuned by post‑transcriptional regulators including microRNAs. Notably, NR4A2 has also been implicated in non‑neuronal tissues where it regulates osteoblast activity, ovarian steroidogenesis and adipose tissue function, thereby broadening its impact on systemic metabolic and homeostatic processes."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "39", "end_ref": "42"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Y H Chen, M T Tsai, C K Shaw, et al. 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