| 2008 |
ENHO encodes a secreted protein called adropin (76 amino acids) expressed in liver and brain. Liver Enho expression is regulated by nutrition (increased by high-fat diet acutely, decreased by fasting and diet-induced obesity). Transgenic overexpression or systemic adropin treatment in diet-induced obese mice attenuated hepatosteatosis and insulin resistance, and adropin regulated expression of hepatic lipogenic genes and adipose tissue PPARγ. |
Transgenic overexpression, systemic peptide treatment, gene expression analysis in mouse models |
Cell metabolism |
High |
19041763
|
| 2016 |
Adropin reduces paracellular permeability of brain endothelial cells exposed to ischemia-like conditions (hypoxia/low glucose) by inhibiting the ROCK–MLC2 signaling pathway. Adropin treatment concentration-dependently reduced MLC2 phosphorylation and attenuated Rho-associated kinase (ROCK) activity without protecting tight junction proteins (occludin, VE-cadherin) or reducing VEGF. |
In vitro BBB model (RBE4 rat brain endothelial cells), FITC-dextran permeability assay, ROCK activity assay, Western blot for MLC2 phosphorylation |
Peptides |
Medium |
27020249
|
| 2017 |
Adropin knockout (AdrKO) mice exhibited reduced eNOS phosphorylation at Ser1177, impaired glycosphingolipid biosynthesis, adipocyte infiltration, loss of Treg cells, and developed fatty pancreas and type 2 diabetes, establishing that adropin deficiency drives these metabolic and immune phenotypes. A Cys56Trp mutation in ENHO was identified in human patients with fatty pancreas and T2DM. |
Adropin knockout mice (C57BL/6J), Western blot for phospho-eNOS, metabolic phenotyping, Treg quantification, human ENHO sequencing |
Cell death & disease |
Medium |
28837146
|
| 2017 |
Hepatic Enho expression is rhythmically controlled by the biological clock, peaking during feeding (dark phase) via transcriptional activation by RORα/γ, and suppressed during the rest phase by Rev-erb. ROR inverse agonists (SR1001), 7-oxygenated sterols (7-β-hydroxysterol, 7-ketocholesterol), and the Rev-erb agonist SR9009 suppress ENHO expression in cultured HepG2 cells. High-cholesterol diets suppress hepatic adropin expression, but adropin overexpression does not prevent hypercholesterolemia. |
In silico expression analysis, cultured human HepG2 cells treated with nuclear receptor ligands, animal dietary intervention, nonhuman primate plasma adropin profiling |
Molecular metabolism |
Medium |
29331507
|
| 2016 |
Adropin deficiency (AdrKO mice) leads to reduced eNOS (Ser1177) and Akt1 (Ser473) phosphorylation and loss of Treg cells, and homo- and heterozygous null mice exhibit MPO-ANCA-associated pulmonary alveolar hemorrhage. Six ENHO mutations (p.Ser43Thr, Cys56Trp) were identified in human MPO-ANCA vasculitis patients. |
Adropin knockout mice, Western blot for phospho-eNOS/Akt1, Treg analysis, human ENHO sequencing in 152 patients |
EBioMedicine |
Medium |
27333037
|
| 2018 |
EOGT (epidermal growth factor domain-specific O-linked GlcNAc transferase) positively regulates ENHO/adropin expression in decidualizing human endometrial stromal cells; EOGT knockdown caused the largest reduction in ENHO among a network of decidual genes. Obesity inversely correlates with both EOGT and ENHO expression in endometrium. |
EOGT siRNA knockdown in primary human endometrial stromal cells, RNA expression profiling, endometrial biopsy analysis |
Endocrinology |
Medium |
29244071
|
| 2019 |
Adropin stimulates proliferation of 3T3-L1 cells and rat primary preadipocytes via ERK1/2 and AKT signaling, and reduces lipid accumulation and expression of pro-adipogenic genes, suppressing differentiation of preadipocytes into mature fat cells. |
3T3-L1 cell and rat primary preadipocyte cultures, BrdU proliferation assay, Oil Red O lipid staining, Western blot for ERK1/2 and AKT phosphorylation, real-time PCR for adipogenic gene expression |
Molecular and cellular endocrinology |
Medium |
31400396
|
| 2020 |
GPR19 is expressed in human HAC15 adrenocortical carcinoma cells and mediates adropin signaling. Adropin decreases expression of steroidogenic genes (StAR, CYP11A1), leading to reduced cortisol and aldosterone biosynthesis via the TGF-β signaling pathway acting through a transactivation mechanism. Adropin stimulates HAC15 cell proliferation via ERK1/2 and AKT signaling pathways. GPR19 expression is not regulated by ACTH, forskolin, or adropin itself. |
HAC15 cell culture, GPR19 expression analysis, steroidogenesis assays (ELISA for cortisol/aldosterone), whole transcriptome study, TGF-β receptor kinase inhibitor rescue experiment, specific intracellular inhibitors for ERK1/2 and AKT |
Frontiers in endocrinology |
Medium |
33133015
|
| 2020 |
STAT3 transcriptionally regulates ENHO/adropin expression in hepatocytes. High glucose increased STAT3 phosphorylation and Enho mRNA in HepG2 cells; pharmacological STAT3 inhibition (Stattic) or STAT3 siRNA knockdown abolished high-glucose-induced Enho upregulation. In diabetic rats, elevated plasma adropin and hepatic Enho expression were reduced by insulin or phloridzin treatment coinciding with reduced STAT3 activity. |
HepG2 cells under high glucose, STAT3 inhibitor (Stattic), STAT3 siRNA knockdown, real-time PCR for Enho mRNA, Western blot for pSTAT3/STAT3, streptozotocin diabetic rat model |
Diabetes, metabolic syndrome and obesity : targets and therapy |
Medium |
32636661
|
| 2020 |
Adropin stimulates proliferation of rat brown preadipocytes and suppresses their differentiation into mature brown adipocytes, reducing mRNA expression of adipogenic genes (C/ebpα, C/ebpβ, Pgc1α, Pparγ, Prdm16), suppressing UCP1 protein, and reducing intracellular lipid content. |
Rat primary brown preadipocyte isolation, BrdU incorporation, real-time PCR, Western blot, Oil Red O staining, glycerol/free fatty acid release assays |
Archives of biochemistry and biophysics |
Medium |
32798458
|
| 2022 |
Genetic deletion of Enho significantly increased infarct volume and worsened neurological function following transient middle cerebral artery occlusion in aged mice, while adropin overexpression dramatically reduced stroke volume. Postischemic adropin treatment reduced blood-brain barrier damage by reducing MMP-9 and preserving tight junction proteins. |
Enho knockout and overexpression mice, transient MCAO model, TTC staining, Western blot for MMP-9 and tight junction proteins, behavioral tests |
Stroke |
High |
36305313
|
| 2022 |
Hepatic adropin/Enho expression is regulated by estrogen; 17β-estradiol tripled Enho expression in BNL 1 ME liver cells with increased adropin secretion. Ovariectomy reduced hepatic Enho expression in mice, and open-access datasets confirmed estrogen-dependent ERα binding to Enho. Adropin treatment in OVX mice reversed adverse adipokine gene expression in visceral adipose tissue. |
Ovariectomy mouse model, in vitro 17β-estradiol treatment of liver cells, RNA-seq, ELISA for adropin, open-access ChIP dataset for ERα binding, adropin peptide treatment |
Molecular metabolism |
Medium |
35364299
|
| 2023 |
Adropin inhibits EndMT (endothelial-to-mesenchymal transition) in HUVECs via the TGF-β/Smad2/3 signaling pathway. In vivo, adropin treatment inhibited atherosclerosis progression in ApoE-/-/Enho-/- mice. Adropin decreased TGF-β1 and TGF-β2 expression and suppressed Smad2/3 phosphorylation; these effects were reversed by TGF-β plasmid transfection. |
ApoE-/-/Enho-/- double knockout mice, HFD atherosclerosis model, Oil Red O staining, HUVEC culture with H2O2-induced EndMT, TGF-β plasmid transfection rescue, Western blot for Smad2/3 phosphorylation, immunofluorescence |
Cell death discovery |
Medium |
37903785
|
| 2024 |
TGFβ reduces adropin/ENHO expression in fibroblasts via a JNK-dependent mechanism. Restoration of adropin signaling with bioactive adropin34-76 peptide inhibits TGFβ-induced fibroblast activation and fibrotic remodeling. Knockdown of GPR19 (adropin receptor) abrogates the antifibrotic effects. RNA-seq and ChIP-seq showed adropin34-76 deactivates GLI1-dependent profibrotic transcriptional networks. These mechanisms were confirmed in primary human dermal fibroblasts, 3D skin equivalents, mouse models (bleomycin and sclGvHD), and precision-cut human skin slices. |
GPR19 siRNA knockdown, RNA-seq, ChIP-seq, in vitro fibroblast cultures, 3D skin equivalents, bleomycin and sclGvHD mouse models, precision-cut human skin slices, JNK inhibitor experiments |
Science translational medicine |
High |
38536934
|
| 2023 |
Adropin deficiency (Enho-/- mice) leads to spontaneous colitis and an imbalance in macrophage polarization (increased M1, decreased M2) in colon and mesenteric tissues. In vitro, adropin regulates lipid metabolism of macrophages through PPARγ, promoting repolarization from M1 to M2. This was demonstrated by combined RNA-seq and metabolomics analysis in RAW264.7 macrophages. |
Enho-/- (AdrKO) mice, TNBS-induced colitis model, RNA-seq and metabolomics of RAW264.7 macrophages, macrophage polarization assays |
International immunopharmacology |
Medium |
37688913
|
| 2023 |
Low-dose adropin (<100 ng/mL) directly increases mitochondrial reactive oxygen species in macrophages to activate the inflammasome, promoting M1 macrophage polarization. High-dose adropin enhances CPT1α expression in macrophages. ENHO-/- mice had fewer M1 macrophages, and ENHO-/- macrophages were resistant to M1 induction. ENHO gene transfection into MC38 colon cancer cells inhibited tumor growth in vivo with increased M1 macrophages. |
Ex vivo macrophage adropin treatment, mitochondrial ROS measurement, inflammasome activation assays, ENHO-/- mice, ENHO gene transfection into MC38 tumor cells, in vivo tumor models |
BMC cancer |
Medium |
37904094
|
| 2022 |
Myricetin increases circulating adropin in type-1 diabetic rats through GLP-1 receptor activation leading to β-endorphin secretion that activates peripheral μ-opioid receptors; GLP-1 receptor antagonist blocked myricetin-induced adropin increases. In HepG2 cells, myricetin-induced GLP-1 receptor activation modulated Enho expression. |
Streptozotocin diabetic rat model, GLP-1 receptor antagonist treatment, adrenalectomy, ELISA for plasma adropin and β-endorphin, qPCR for Enho in HepG2 cells |
Pharmaceuticals (Basel, Switzerland) |
Low |
35215286
|
| 2023 |
In mouse testis, adropin alone inhibits testosterone synthesis by suppressing P450-SCC, 3β-HSD, and 17β-HSD expression, while adropin combined with insulin stimulates testicular testosterone synthesis by increasing GPR19, IR, StAR, P450-SCC, 3β-HSD, and 17β-HSD expression. Adropin promotes germ cell survival and proliferation by upregulating PCNA, Bcl2, and pERK1/2. GPR19 was identified on pachytene spermatocytes and Leydig cells. |
Immunohistochemistry for adropin/GPR19 in mouse testis, in vitro testicular slice culture, Western blot for steroidogenic enzymes and signaling proteins, Enho mRNA expression |
Journal of experimental zoology. Part A, Ecological and integrative physiology |
Low |
37902254
|
| 2025 |
Adropin exerts protective effects in LPS-induced septic cardiomyopathy by activating the Nrf2/ARE signaling pathway, increasing antioxidant proteins (NQO1, GPX1, Nrf2), reducing ROS, and suppressing pro-inflammatory cytokines (TNF-α, IL-6, IL-1β) and apoptosis (reduced Bax, increased Bcl-2). The Nrf2 inhibitor ML385 blocked adropin's antioxidant effects. |
LPS mouse model of myocardial injury, Nrf2 inhibitor (ML385) rescue experiment, qRT-PCR, Western blot, DHE staining and flow cytometry for ROS, echocardiography |
International immunopharmacology |
Medium |
41391279
|
| 2025 |
Adropin promotes macrophage M2 polarization by upregulating heme oxygenase-1 (HO-1), and adropin-treated macrophage-conditioned medium induces browning of fully differentiated 3T3-L1 adipocytes. In PCOS model mice, adropin treatment reduced body weight and promoted M2 macrophage phenotype and white adipose tissue browning. |
RAW264.7 macrophage HO-1 expression analysis, conditioned medium transfer to 3T3-L1 adipocytes, letrozole-induced PCOS mouse model, in vivo adropin injection |
International immunopharmacology |
Low |
39933360
|
| 2025 |
ENHO/adropin transcriptional co-expression structures across human tissues revealed that liver ENHO expression co-regulates skeletal muscle mitochondrial function (confirmed in liver-specific knockout mice). Within-liver ENHO expression reflects lipoprotein metabolism (APOC1, APOA1). Statin treatment (which increases hepatic cholesterol efflux) reduces plasma adropin levels. The ENHO gene contains RORE elements, linking it to circadian/ROR regulation across tissues. |
Transcriptomic correlation analysis across human tissues (GD-CAT), liver-specific knockout mice, plasma adropin/lipoprotein correlation, statin-treatment experiment |
Molecular metabolism |
Medium |
40578684
|
| 2019 |
Hepatic ENHO expression in nonhuman primates associates with genes involved in glucose and lipid metabolism, and co-regulated genes are enriched for epigenetic silencing by histone H3K27 trimethylation and neural function pathways. Low plasma adropin concentrations predict greater weight gain and metabolic dysregulation (hyperglycemia, elevated APOC3/triglycerides) during high-sugar diet consumption. |
In silico expression profiling (diurnal transcriptome atlas GSE98965), unsupervised hierarchical clustering, Gene Ontology analysis, dietary intervention in 59 adult male rhesus macaques |
The Journal of biological chemistry |
Low |
30988006
|