Differences in NGFI-B, Nurr1, and NOR-1 expression and nucleocytoplasmic translocation in glutamate-treated neurons.
Boldingh Debernard KA, Mathisen GH, Paulsen RE
This study shows that glutamate exposure causes the NR4A2 protein (Nurr1) to move from the nucleus to other parts of the cell in rat neurons, a process that happens more slowly than for related proteins. The findings describe basic cellular mechanics of how these proteins respond to stress signals in animal models.
- Glutamate triggers Nurr1 to leave the nucleus in rat cerebellar neurons.
- Nurr1 translocation occurs later than that of NGFI-B and NOR-1.
- The study uses rat neurons, not human cells or patients.
- No treatment or clinical application is tested or proposed.
Lmx1b can promote the differentiation of embryonic stem cells to dopaminergic neurons associated with Parkinson's disease.
Tian LP, Zhang S, Zhang YJ, Ding JQ, Chen SD
This study shows that adding the Lmx1b gene to embryonic stem cells significantly increases the production of functional dopamine neurons in a lab dish. The research demonstrates a method for generating these specific nerve cells but does not involve human patients or clinical treatments.
- Lmx1b gene boosts dopamine neuron yield from stem cells from 18% to nearly 50%.
- New neurons express mature markers like Nurr1 and DAT.
- Neurons function correctly by reuptaking dopamine in lab assays.
- Study uses embryonic stem cells, not human participants or animal models.
Direct regulation of Pitx3 expression by Nurr1 in culture and in developing mouse midbrain.
Volpicelli F, De Gregorio R, Pulcrano S, Perrone-Capano C, di Porzio U, Bellenchi GC
Nurr1 directly controls the expression of Pitx3, a critical gene for developing dopamine neurons, by binding to its promoter. This mechanism operates in both cell cultures and developing mouse brains, establishing a direct regulatory link between these two transcription factors.
- Nurr1 binds directly to the Pitx3 gene promoter to regulate its expression.
- This interaction occurs in dopaminergic cell cultures and embryonic mouse midbrain tissue.
- Pitx3 is essential for the development and function of dopamine neurons.
- The study uses mouse models and cell lines, not human participants.
Orphan nuclear receptor Nur77 promotes acute kidney injury and renal epithelial apoptosis.
Balasubramanian S, Jansen M, Valerius MT, Humphreys BD, Strom TB
This study shows that the protein Nur77 drives kidney damage and cell death during acute injury, while retinoic acid protects kidneys by suppressing Nur77. The findings are specific to renal physiology and do not address the neurological or developmental aspects of NR4A2-related syndromes.
- Nur77 promotes kidney cell death after ischemia-reperfusion injury.
- Retinoic acid protects kidneys by inhibiting Nur77 expression.
- The research focuses on renal epithelial cells, not neurons.
- No connection to NR4A2-related neurodevelopmental phenotypes is established.
miR-132 regulates the differentiation of dopamine neurons by directly targeting Nurr1 expression.
Yang D, Li T, Wang Y, Tang Y, Cui H, Tang Y, Zhang X, Chen D, Shen N, Le W
This study shows that miR-132 suppresses the development of dopamine neurons by directly reducing Nurr1 levels in mouse embryonic stem cells. Blocking miR-132 promotes the formation of these neurons, while adding more miR-132 inhibits it.
- miR-132 directly targets and reduces Nurr1 expression in developing dopamine neurons.
- Inhibiting miR-132 increases the number of differentiated dopamine neurons from stem cells.
- Excess miR-132 decreases dopamine neuron differentiation without affecting total cell survival.
- Findings rely on mouse embryonic stem cell models, not human patients.
Human cord blood-derived multipotent stem cells (CB-SCs) treated with all-trans-retinoic acid (ATRA) give rise to dopamine neurons.
Li X, Li H, Bi J, Chen Y, Jain S, Zhao Y
This study shows that human stem cells from cord blood can be converted into dopamine-producing neurons in a lab dish using retinoic acid. The treated cells express key dopaminergic markers and release dopamine, demonstrating their potential as a source for cell replacement therapy in Parkinson's disease.
- Cord blood stem cells differentiate into dopamine neurons when treated with all-trans-retinoic acid.
- Treated cells express tyrosine hydroxylase and dopamine transporter proteins.
- Cells release dopamine upon stimulation, confirming functional dopaminergic activity.
- This is preclinical research on Parkinson's disease cell therapy strategies.
The nuclear orphan receptor Nur77 is a lipotoxicity sensor regulating glucose-induced insulin secretion in pancreatic β-cells.
Briand O, Helleboid-Chapman A, Ploton M, Hennuyer N, Carpentier R, Pattou F, Vandewalle B, Moerman E, Gmyr V, Kerr-Conte J, Eeckhoute J, Staels B, Lefebvre P
This study identifies Nur77 (NR4A1) as a sensor that impairs insulin secretion in pancreatic beta cells when exposed to fatty acids. It demonstrates that Nur77 disrupts zinc balance and interacts with FoxO1 to reduce insulin production, highlighting a specific metabolic pathway distinct from the dopaminergic system relevant to NR4A2 syndrome.
- Nur77 (NR4A1) is distinct from Nurr1 (NR4A2), the gene associated with this child's syndrome.
- The research focuses on pancreatic beta cells and insulin regulation, not brain dopamine neurons.
- Nur77 impairs insulin secretion by altering zinc homeostasis and interacting with FoxO1.
- Findings relate to glucose metabolism and lipotoxicity in the pancreas.
Nurr1 regulates Top IIβ and functions in axon genesis of mesencephalic dopaminergic neurons.
Heng X, Jin G, Zhang X, Yang D, Zhu M, Fu S, Li X, Le W
Nurr1 directly controls the expression of Topoisomerase IIβ, a gene essential for building the axons that connect dopaminergic neurons to their targets. Without this regulation, these neural connections fail to form properly, leading to neuron loss and pathway deficiency.
- Nurr1 binds directly to the Top IIβ gene promoter to regulate its expression.
- Loss of Nurr1 reduces Top IIβ levels, preventing proper axon growth in dopaminergic neurons.
- Suppressing Top IIβ causes neurite shortening and collapse in cultured neurons.
- Blocking Top IIβ in mice disrupts the nigro-striatal neural pathway.
Nurr1 protein is required for N-methyl-D-aspartic acid (NMDA) receptor-mediated neuronal survival.
Barneda-Zahonero B, Servitja JM, Badiola N, Miñano-Molina AJ, Fadó R, Saura CA, Rodríguez-Alvarez J
Nurr1 is essential for protecting neurons from death by enabling the production of BDNF, a protein that supports cell survival. This process occurs when NMDA receptors stimulate the brain, triggering a molecular chain reaction that activates Nurr1 to boost BDNF levels.
- Nurr1 acts downstream of CREB to drive BDNF expression in developing neurons.
- Silencing Nurr1 reduces BDNF and removes the neuroprotective effect of NMDA stimulation.
- The study uses cerebellar granule cells, a specific type of brain neuron.
- Findings are based on cell culture experiments, not human or animal models.
NR4A nuclear receptors mediate carnitine palmitoyltransferase 1A gene expression by the rexinoid HX600.
Ishizawa M, Kagechika H, Makishima M
The drug HX600 activates the NR4A2 protein to increase expression of CPT1A, a gene involved in fatty acid metabolism. This effect occurs in human cell lines and depends on the presence of NR4A2 or its relative Nur77.
- HX600 directly increases CPT1A gene expression via NR4A2/Nur77.
- This mechanism works in human teratocarcinoma and kidney cells.
- CPT1A regulates fatty acid oxidation, not dopamine production.
- Study uses cell lines only; no animal or human data.
Prenatal immune activation interacts with genetic Nurr1 deficiency in the development of attentional impairments.
Vuillermot S, Joodmardi E, Perlmann T, Ögren SO, Feldon J, Meyer U
In mice, combining a genetic Nurr1 deficiency with prenatal immune activation causes severe attention deficits and dopamine system abnormalities that neither factor produces alone. This gene-environment interaction suggests that environmental insults during pregnancy may worsen neurodevelopmental outcomes in children with NR4A2 mutations.
- Prenatal immune challenge worsens attention and dopamine defects in Nurr1-deficient mice.
- Genetic and environmental factors act synergistically, not just additively, to cause harm.
- Both factors are required to trigger maldevelopment of prefrontal and striatal dopamine systems.
- Findings model gene-environment interactions relevant to ADHD and schizophrenia.
Nurr1 haplotypes are associated with femoropopliteal restenosis/re-occlusion after percutaneous transluminal angioplasty.
Božič-Mijovski M, Bedenčič M, Stegnar M, Salapura V, Ježovnik MK, Kozak M, Blinc A
This study links specific variations in the NR4A2 gene to blood vessel re-narrowing after leg artery surgery, which is unrelated to the neurological symptoms of NR4A2 syndrome. It does not provide information on brain development, movement disorders, or potential treatments for children with this condition.
- The research focuses on vascular restenosis after leg angioplasty, not neurodevelopment.
- It examines NR4A2 variants in adults with peripheral artery disease.
- Findings do not apply to the central nervous system or pediatric care.
- No insights are offered for managing NR4A2-related neurological symptoms.
CREB-regulated transcription coactivator 1-dependent transcription in Alzheimer's disease mice.
Saura CA
This study finds that Alzheimer's disease in mice disrupts the signaling pathway involving NR4A2, leading to reduced gene expression and memory deficits. Pharmacological activation of calcium channels restores this disrupted signaling in mouse neurons.
- NR4A2 expression decreases in the hippocampus of Alzheimer's model mice.
- Alzheimer's pathology disrupts CRTC1-mediated transcriptional activation.
- Calcium channel activation reverses transcription deficits in mouse neurons.
- The study uses transgenic mice, not human participants.
The function and mechanisms of Nurr1 action in midbrain dopaminergic neurons, from development and maintenance to survival.
Luo Y
This review summarizes how the Nurr1 protein supports the development, maintenance, and survival of dopamine-producing neurons in the brain. It identifies specific molecular partners and target genes that regulate Nurr1's function within these cells.
- Nurr1 is essential for creating midbrain dopamine neurons during mouse development.
- Reduced Nurr1 activity causes progressive loss of dopamine markers in adult mice.
- Nurr1 directly regulates the VIP gene to support neuronal function.
- A new interacting protein, NuIP, enhances Nurr1 activity in adult neurons.
Spontaneous Expression of Neurotrophic Factors and TH, Nurr1, Nestin Genes in Long-term Culture of Bone Marrow Mesenchymal Stem Cells.
Moradi F, Haji Ghasem Kashani M, Ghorbanian MT, Lashkarbolouki T
Rat bone marrow stem cells spontaneously transform into neural-like cells in long-term culture without added growth factors. These cultured cells express Nurr1, tyrosine hydroxylase, and nestin, indicating a shift toward a neural precursor identity.
- Rat bone marrow stem cells self-differentiate into neural precursors over three weeks.
- No external growth factors or chemicals are required for this transformation.
- Cells express Nurr1, tyrosine hydroxylase, and nestin genes during differentiation.
- This is a preclinical study using rat cells, not human patients.
The Transcription Factor NURR1 Exerts Concentration-Dependent Effects on Target Genes Mediating Distinct Biological Processes.
Johnson MM, Michelhaugh SK, Bouhamdan M, Schmidt CJ, Bannon MJ
This study shows that the amount of NURR1 protein determines which genes are turned on or off in human nerve cells. It confirms that NURR1 levels directly control biological pathways relevant to dopamine neuron survival.
- Researchers used human nerve cells with varying NURR1 levels to study gene regulation.
- NURR1 concentration dictates which specific genes and biological processes are activated.
- The findings support the potential for therapies that adjust NURR1 activity.
- This is basic molecular biology without clinical data or patient outcomes.
Reduction in inflammatory gene expression in skeletal muscle from Roux-en-Y gastric bypass patients randomized to omentectomy.
Tamboli RA, Hajri T, Jiang A, Marks-Shulman PA, Williams DB, Clements RH, Melvin W, Bowen BP, Shyr Y, Abumrad NN, Flynn CR
This study examines how bariatric surgery affects gene expression in skeletal muscle and is not relevant to NR4A2-related syndromes. The research focuses on inflammation reduction in obesity patients rather than neurological development or dopaminergic function. It does not provide insights into the genetic mechanisms or treatments for NR4A2 conditions.
- Study analyzes skeletal muscle gene expression after gastric bypass surgery.
- Focuses on inflammatory pathways and metabolic changes in obesity treatment.
- NR4A2 appears only as one of many transcription factors with decreased expression.
- No connection to dopaminergic neurons, brain development, or NR4A2 syndrome phenotypes.
- Results apply to weight-loss surgery outcomes, not genetic neurological disorders.
Neurobehavioral and transcriptional effects of acrylamide in juvenile rats.
Seale SM, Feng Q, Agarwal AK, El-Alfy AT
Acrylamide exposure reduces the expression of the Nr4a2 gene in the developing brains of juvenile rats, alongside causing motor deficits and changes in pain regulation. This study identifies a potential environmental mechanism for lowering NR4A2 levels but does not provide clinical evidence or treatment options for humans.
- Acrylamide lowers Nr4a2 gene expression in the rat cerebellum during development.
- Rat pups show motor symptoms like decreased grip strength and locomotor activity.
- The study uses a juvenile rat model, not human patients or clinical data.
- Findings suggest environmental toxins might impact NR4A2 pathways but lack direct relevance to therapy.
The nuclear receptors NUR77, NURR1 and NOR1 in obesity and during fat loss.
Veum VL, Dankel SN, Gjerde J, Nielsen HJ, Solsvik MH, Haugen C, Christensen BJ, Hoang T, Fadnes DJ, Busch C, Våge V, Sagen JV, Mellgren G
This study finds that NR4A2 and related proteins are highly expressed in the fat tissue of extremely obese humans and return to normal levels after significant weight loss. The research focuses on metabolic regulation in adipose tissue rather than neurological development or dopaminergic function.
- NR4A2 expression is high in extreme obesity and normalizes after fat loss.
- Proteins are most abundant in stromal-vascular cells, not mature fat cells.
- Expression decreases as human preadipocytes differentiate into fat cells.
- Study examines metabolic roles in fat tissue, not brain or nerve function.
Retinoic acid-dependent and -independent gene-regulatory pathways of Pitx3 in meso-diencephalic dopaminergic neurons.
Jacobs FM, Veenvliet JV, Almirza WH, Hoekstra EJ, von Oerthel L, van der Linden AJ, Neijts R, Koerkamp MG, van Leenen D, Holstege FC, Burbach JP, Smidt MP
This study maps how the transcription factor Pitx3 controls gene expression in dopamine neurons, distinguishing which genes require retinoic acid signaling and which do not. It confirms that Pitx3 regulates multiple downstream targets independently of retinoic acid, providing a detailed molecular map of dopaminergic neuron development.
- Pitx3 regulates specific dopamine neuron genes through both retinoic acid-dependent and independent pathways.
- Retinoic acid signaling is essential for the differentiation and survival of substantia nigra neurons.
- Genes like Vmat2, Dat, and En1 are controlled by Pitx3 without needing retinoic acid.
- The research identifies distinct molecular subsets within developing dopamine neurons.
Long-term memory deficits in Huntington's disease are associated with reduced CBP histone acetylase activity.
Giralt A, Puigdellívol M, Carretón O, Paoletti P, Valero J, Parra-Damas A, Saura CA, Alberch J, Ginés S
This study shows that memory deficits in a mouse model of Huntington's disease are linked to reduced activity of the protein CBP and lower levels of specific histone modifications. Treatment with a drug that inhibits histone deacetylases restores these molecular changes and improves memory in the mice.
- Memory loss in HD mice correlates with reduced CBP and histone H3 acetylation.
- Expression of Nr4a2 and other memory-related genes decreases in the hippocampus.
- HDAC inhibitor treatment rescues both gene expression and memory deficits in mice.
FHL2 protein is a novel co-repressor of nuclear receptor Nur77.
Kurakula K, van der Wal E, Geerts D, van Tiel CM, de Vries CJ
This study identifies FHL2 as a protein that binds to and suppresses the activity of Nurr1 (NR4A2) in vascular cells. The research demonstrates that this interaction regulates smooth muscle cell growth but does not address neurological function or potential treatments for NR4A2-related syndromes.
- FHL2 binds directly to Nurr1 and represses its ability to activate genes.
- The interaction occurs in vascular cells, not neurons or immune cells.
- Blocking FHL2 increases Nurr1 activity and promotes smooth muscle cell growth.
- Findings link this molecular mechanism to vascular disease rather than neurodevelopment.
Prolonged membrane depolarization enhances midbrain dopamine neuron differentiation via epigenetic histone modifications.
He XB, Yi SH, Rhee YH, Kim H, Han YM, Lee SH, Lee H, Park CH, Lee YS, Richardson E, Kim BW, Lee SH
Chemical stimulation that mimics electrical activity in neural precursor cells enhances the production of dopamine neurons by modifying chromatin structure. This process allows the Nurr1 protein to bind more effectively to genes required for dopamine neuron development, increasing their yield in laboratory cultures.
- Membrane depolarization boosts dopamine neuron differentiation from midbrain precursor cells.
- The mechanism operates independently of intracellular calcium levels.
- Nurr1 recruitment to gene promoters increases via histone modification.
- Chromatin opens by removing repressor complexes from DNA regions.
- This is a cell culture study with no human or animal data.
Dental pulp stem cells: osteogenic differentiation and gene expression.
Mori G, Brunetti G, Oranger A, Carbone C, Ballini A, Lo Muzio L, Colucci S, Mori C, Grassi FR, Grano M
This study shows that NURR1 (NR4A2) gene expression increases when dental pulp stem cells differentiate into bone-forming cells. The research focuses on the role of NURR1 in osteogenesis rather than its function in the developing brain or nervous system. This finding does not provide direct insight into the neurological symptoms or treatment options for NR4A2-related syndromes.
- NURR1 expression rises during dental pulp stem cell differentiation into bone cells.
- The study examines osteogenic pathways, not dopaminergic or neurological functions.
- No clinical data or human patient outcomes are reported.
- Findings relate to bone biology rather than neurodevelopmental disorders.
MicroRNA-mediated dysregulation of neural developmental genes in HPRT deficiency: clues for Lesch-Nyhan disease?
Guibinga GH, Hrustanovic G, Bouic K, Jinnah HA, Friedmann T
This study shows that a specific microRNA (miR181a) is overexpressed in human dopaminergic cells lacking the HPRT enzyme, leading to the downregulation of key developmental genes including Nurr1. The findings suggest that this molecular pathway contributes to dopamine system defects in Lesch-Nyhan disease, though the results are limited to cell culture models.
- miR181a is elevated in HPRT-deficient human dopaminergic cells.
- High miR181a levels reduce expression of Nurr1 and other neural genes.
- Inhibiting miR181a restores normal gene expression in these cells.
- Results are from cell lines, not human patients or animal models.
- Relevance to Lesch-Nyhan disease pathogenesis remains unproven in vivo.
Gene expression profiling reveals renin mRNA overexpression in human hypertensive kidneys and a role for microRNAs.
Marques FZ, Campain AE, Tomaszewski M, Zukowska-Szczechowska E, Yang YH, Charchar FJ, Morris BJ
This study found that renin mRNA is overexpressed in kidneys of people with hypertension, and identified specific microRNAs that normally suppress renin levels. When these microRNAs are reduced, renin increases, contributing to high blood pressure. The findings highlight a key regulatory mechanism in kidney-related hypertension.
- Renin mRNA is overexpressed in hypertensive kidneys
- MicroRNAs hsa-let-7c and hsa-miR-663 regulate renin and other genes
- Reduced microRNAs lead to higher renin levels
- NR4A2 is targeted by hsa-let-7c, but not directly linked to hypertension here
- Findings reveal new pathways in kidney-driven hypertension
The impact of early life permethrin exposure on development of neurodegeneration in adulthood.
Carloni M, Nasuti C, Fedeli D, Montani M, Amici A, Vadhana MS, Gabbianelli R
Early-life exposure to the pesticide permethrin reduces Nurr1 expression and disrupts calcium and nitric oxide levels in the striatum of rats, leading to dopaminergic neuron vulnerability. This animal model suggests that environmental toxins can interact with NR4A2 pathways to promote neurodegeneration later in life.
- Permethrin exposure in young rats decreases Nurr1 protein and mRNA in the striatum.
- The pesticide causes calcium and nitric oxide imbalances in brain regions like the hippocampus.
- Reduced Nurr1 fails to protect dopaminergic neurons from inflammatory damage.
- Findings link early environmental toxin exposure to adult neurodegeneration mechanisms.
Regulatory effects of costunolide on dopamine metabolism-associated genes inhibit dopamine-induced apoptosis in human dopaminergic SH-SY5Y cells.
Ham A, Lee SJ, Shin J, Kim KH, Mar W
Costunolide protects human dopaminergic cells from dopamine-induced death by increasing levels of key dopamine-related proteins and decreasing alpha-synuclein. This compound shows potential as a therapy for Parkinson's disease in this cell-based model.
- Costunolide prevents cell death in human dopaminergic SH-SY5Y cells exposed to dopamine.
- The treatment increases Nurr1, DAT, and VMAT2 protein levels in these cells.
- Alpha-synuclein levels decrease when cells are treated with costunolide alongside dopamine.
- This is a preclinical study using cell lines, not human patients or animals.
Delayed cortical impairment following lipopolysaccharide exposure in preterm fetal sheep.
Dean JM, van de Looij Y, Sizonenko SV, Lodygensky GA, Lazeyras F, Bolouri H, Kjellmer I, Huppi PS, Hagberg H, Mallard C
Fetal exposure to infection-like inflammation reduces brain volume and damages neurons in a sheep model of preterm development. This study identifies Nurr1-positive subplate neurons as particularly vulnerable to inflammatory injury during early cortical maturation. The findings suggest that maternal or fetal infections may contribute to long-term brain structural deficits seen in preterm infants.
- Inflammation reduces white matter and cortical volume in preterm fetal sheep.
- Nurr1-positive subplate neurons show significant loss after inflammatory exposure.
- Cortical EEG amplitude decreases, correlating with reduced brain tissue volume.
- Oligodendrocyte numbers drop, indicating white matter injury mechanisms.
Dopamine D1 receptor modulation in nucleus accumbens lowers voluntary wheel running in rats bred to run high distances.
Roberts MD, Gilpin L, Parker KE, Childs TE, Will MJ, Booth FW
Modulating dopamine D1 receptors in the nucleus accumbens reduces voluntary exercise in rats genetically predisposed to high activity levels. This effect occurs regardless of whether the receptor is activated or blocked, suggesting that optimal D1 signaling supports their running behavior. The study finds no difference in gene expression between high and low runners, indicating the behavioral difference stems from functional receptor dynamics rather than baseline mRNA levels.
- D1 receptor modulation reduces wheel running only in rats bred for high activity.
- Both D1 agonists and antagonists decrease running distance in these specific rats.
- Low-activity rats show no change in running after D1 receptor manipulation.
- Gene expression levels are similar between high and low running rat lines.
- Results highlight the role of NAc D1 signaling in voluntary exercise behavior.
Pituitary adenylate cyclase-activating polypeptide controls stimulus-transcription coupling in the hypothalamic-pituitary-adrenal axis to mediate sustained hormone secretion during stress.
Stroth N, Liu Y, Aguilera G, Eiden LE
This study identifies a stress-response mechanism in mice where the hormone PACAP triggers the release of cortisol-like hormones by activating specific transcription factors, including Nurr1 (NR4A2), in the brain and adrenal glands. The findings describe how these molecular pathways function during physiological stress but do not provide evidence for treating NR4A2-related syndromes or understanding their developmental impact.
- PACAP drives stress hormone release by activating Nurr1 and related factors in mouse brains.
- The study uses mouse models, not human patients with NR4A2 variants.
- It focuses on acute stress physiology rather than neurodevelopmental outcomes.
- No clinical implications or treatments for NR4A2 syndrome are presented.