{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nAdropin (encoded by the Energy Homeostasis Associated gene) is a multifunctional peptide that plays a central role in energy balance and metabolic regulation. It is expressed predominantly in the liver and brain, and its circulating levels fluctuate in response to nutritional states – rising with high‐fat feeding and declining during fasting – with emerging protective effects against obesity‐associated insulin resistance and hepatosteatosis. These findings implicate adropin as a key mediator in maintaining glucose and lipid homeostasis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its systemic metabolic actions, adropin has been shown to affect substrate oxidation preferences and hepatic glucose production. In skeletal muscle, it favors carbohydrate oxidation by activating pyruvate dehydrogenase and suppressing enzymes involved in fatty acid metabolism, while in the liver it enhances insulin signaling, alleviates endoplasmic reticulum stress, and curbs gluconeogenesis by modulating key transcriptional coregulators and intracellular kinases. In adipose cells, adropin stimulates preadipocyte proliferation via ERK1/2 and AKT but attenuates their differentiation into fat‐storing cells. Moreover, caloric restriction studies indicate that adropin levels remain elevated to counterbalance hyperglycemia and metabolic syndrome features, an observation extended even to its clinical correlations with nonalcoholic fatty liver disease severity."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "3", "end_ref": "10"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAdropin also exerts beneficial effects on the vasculature. Studies in animal models and humans demonstrate that its decline with aging is accompanied by impaired endothelial nitric oxide synthase activation and vascular dysfunction, whereas aerobic exercise restores both arterial and circulating levels of adropin. This restoration is paralleled by improved endothelial function and enhanced nitric oxide production, underscoring a therapeutic potential for vascular aging and atherosclerotic disorders."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "11"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn the central nervous system, a membrane‐associated form of adropin is highly expressed in the brain where it interacts with the NB-3/Contactin 6 ligand to potentiate Notch signaling. This interaction promotes the activation of downstream Notch target genes, and its disruption (as seen in adropin knockout mice) is associated with impaired synapse formation, decreased locomotor activity, and defects in motor coordination—thus linking adropin to proper cerebellar development and neural function."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "13"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAdropin is also emerging as a regulator of ovarian physiology. Experimental studies in pre‐pubertal mice reveal that adropin is expressed in ovarian compartments where it correlates positively with steroid hormone production. Administration of adropin promotes early folliculogenesis by enhancing granulosa cell proliferation and upregulating key steroidogenic proteins, suggesting a role in accelerating pubertal development and potentially offering therapeutic avenues for pubertal delay."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "14"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn the context of immune modulation and inflammatory injury, adropin has been implicated in dampening pro‐inflammatory responses. For instance, in models of acute pancreatitis–associated lung injury and in vascular inflammatory conditions like ANCA-associated vasculitis, adropin modulates macrophage polarization toward an anti-inflammatory M2 phenotype and regulates the expression of critical transcriptional factors, including distinct PPAR isoforms. These actions contribute to reduced tissue fibrosis, diminished apoptosis, and improved overall tissue recovery following inflammatory insults."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "15"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nFinally, while adropin has been extensively studied for its diverse roles in energy metabolism, vascular function, neural signaling, and immune regulation, its involvement in congenital developmental disorders—for example, congenital anomalies of the kidney and urinary tract (CAKUT)—has not been substantiated, highlighting the specificity of its biological functions."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "17"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "K Ganesh Kumar, James L Trevaskis, Daniel D Lam, et al. 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