Contra-directional Coupling of Nur77 and Nurr1 in Neurodegeneration: A Novel Mechanism for Memantine-Induced Anti-inflammation and Anti-mitochondrial Impairment.
Wei X, Gao H, Zou J, Liu X, Chen D, Liao J, Xu Y, Ma L, Tang B, Zhang Z, Cai X, Jin K, Xia Y, Wang Q
This study shows that memantine protects dopaminergic neurons in a cell culture model of Parkinson's disease by balancing the opposing actions of two related proteins, Nur77 and Nurr1. Memantine reduces harmful mitochondrial stress caused by Nur77 while restoring protective signals from Nurr1.
- Memantine restores balance between Nur77 and Nurr1 in damaged dopaminergic cells.
- Nur77 promotes cell death via mitochondrial impairment, while Nurr1 supports survival.
- The drug reduces harmful protein movement within the cell under stress conditions.
- Knocking down Nur77 mimics some protective effects of memantine in these cells.
Nurr1 and Retinoid X Receptor Ligands Stimulate Ret Signaling in Dopamine Neurons and Can Alleviate α-Synuclein Disrupted Gene Expression.
Volakakis N, Tiklova K, Decressac M, Papathanou M, Mattsson B, Gillberg L, Nobre A, Björklund A, Perlmann T
This study shows that Nurr1 protects dopamine neurons by regulating the Ret signaling pathway, which is disrupted by alpha-synuclein toxicity. While the specific drug tested (bexarotene) failed to protect neurons in live rats, it successfully restored this protective signaling in laboratory cells.
- Nurr1 restores hundreds of genes disrupted by alpha-synuclein in dopamine neurons.
- Bexarotene activates Nurr1 partners to restore Ret neurotrophic signaling in cells.
- Bexarotene failed to provide neuroprotection in a live rat Parkinson's model.
- The study highlights the Nurr1-Ret pathway as a potential therapeutic target.
Modulation by Trace Amine-Associated Receptor 1 of Experimental Parkinsonism, L-DOPA Responsivity, and Glutamatergic Neurotransmission.
Alvarsson A, Zhang X, Stan TL, Schintu N, Kadkhodaei B, Millan MJ, Perlmann T, Svenningsson P
This study investigates how the TAAR1 receptor influences dopamine and glutamate signaling in mouse models of Parkinson's disease. It finds that blocking TAAR1 reduces dopaminergic neuron loss but worsens L-DOPA side effects, while activating TAAR1 protects neurons and reduces dyskinesia.
- TAAR1 activation protects dopaminergic neurons from degeneration in mouse models.
- Blocking TAAR1 increases L-DOPA-induced dyskinesia and rotational behavior in mice.
- TAAR1 modulates glutamate neurotransmission similarly to dopamine D2 receptors.
- The research focuses on molecular mechanisms, not human clinical outcomes.
Dissecting the role of Engrailed in adult dopaminergic neurons--Insights into Parkinson disease pathogenesis.
Rekaik H, Blaudin de Thé FX, Prochiantz A, Fuchs J, Joshi RL
This review explains how the Engrailed proteins support adult dopamine neuron survival and mitochondrial function, offering mechanistic context for why dopaminergic pathways are vulnerable in neurodevelopmental disorders. It highlights that multiple transcription factors, including Nurr1 (NR4A2), work together to maintain these neurons throughout life.
- Engrailed proteins protect adult dopamine neurons by regulating mitochondrial energy production.
- Loss of Engrailed causes progressive dopamine neuron death and Parkinson-like symptoms in mice.
- Nurr1 (NR4A2) works alongside other factors to maintain adult dopamine neuron survival.
- The paper reviews molecular mechanisms rather than testing treatments or human outcomes.
Eomesodermin-expressing T-helper cells are essential for chronic neuroinflammation.
Raveney BJ, Oki S, Hohjoh H, Nakamura M, Sato W, Murata M, Yamamura T
This study identifies a specific type of immune cell, Eomes-expressing T-helper cells, as the primary driver of chronic neuroinflammation in mouse models and progressive multiple sclerosis patients. It demonstrates that removing these cells reduces disease severity, highlighting a potential new target for treating inflammatory neurological conditions.
- Eomes-expressing CD4+ T cells drive late-onset neuroinflammation in mice.
- Deleting the Eomes gene significantly improves symptoms in chronic disease models.
- These specific immune cells are elevated in progressive multiple sclerosis patients.
- The mechanism involves granzyme B and protease-activated receptor-1 pathways.
Differentiation of stem cells derived from carious teeth into dopaminergic-like cells.
Gnanasegaran N, Govindasamy V, Abu Kasim NH
Stem cells from decayed teeth can turn into dopamine-producing cells, but they do so less efficiently than stem cells from healthy teeth, suggesting they may not be ideal for treating conditions like NR4A2-related syndrome.
- Stem cells from decayed teeth make fewer dopamine-like cells
- Key brain cell genes like NURR1 are less active in these cells
- Cells from healthy teeth work better for dopamine cell production
- Not all stem cell sources are equal for brain repair therapies
- More testing is needed before using these cells in treatment
Parathyroid hormone 1 receptor is essential to induce FGF23 production and maintain systemic mineral ion homeostasis.
Fan Y, Bi R, Densmore MJ, Sato T, Kobayashi T, Yuan Q, Zhou X, Erben RG, Lanske B
This study shows that the PTH1 receptor in bones is essential for producing FGF23, a key hormone that controls phosphate and vitamin D levels in the blood. Without this receptor, the body cannot properly regulate mineral balance, leading to low phosphate, low vitamin D, and excessive loss of calcium and phosphate in urine.
- PTH1R in bones triggers FGF23 production
- Loss of PTH1R reduces FGF23 by half
- Mineral balance is disrupted without PTH1R signaling
- Kidney genes that manage minerals are suppressed
- PTH cannot boost FGF23 or Nurr1 without PTH1R
Noggin Over-Expressing Mouse Embryonic Fibroblasts and MS5 Stromal Cells Enhance Directed Differentiation of Dopaminergic Neurons from Human Embryonic Stem Cells.
Lim MS, Shin MS, Lee SY, Minn YK, Hoh JK, Cho YH, Kim DW, Lee SH, Kim CH, Park CH
Adding noggin to the culture system improves the efficiency of converting human embryonic stem cells into dopaminergic neurons. This method increases the expression of key midbrain dopamine markers and reduces undifferentiated cell populations.
- Noggin exposure enhances directed differentiation of human embryonic stem cells into dopaminergic precursors.
- The approach boosts expression of midbrain-specific markers like En-1, Lmx1b, and Nurr1.
- Tyrosine hydroxylase levels increase, indicating successful maturation toward dopamine-producing neurons.
- Undifferentiated marker Oct3/4 decreases as cells commit to the dopaminergic lineage.
Predicting functional regulatory SNPs in the human antimicrobial peptide genes DEFB1 and CAMP in tuberculosis and HIV/AIDS.
Flores Saiffe Farías A, Jaime Herrera López E, Moreno Vázquez CJ, Li W, Prado Montes de Oca E
This study uses computational methods to predict how genetic variations in immune system genes affect disease susceptibility for tuberculosis and HIV/AIDS. It identifies NR4A2 as one of several transcription factors that may bind to these gene regions, but it does not investigate NR4A2's role in brain development or neurological function.
- The research focuses on antimicrobial genes DEFB1 and CAMP, not NR4A2 or neurological pathways.
- NR4A2 appears only as one of many transcription factors analyzed for immune disease binding.
- The study develops a computational algorithm for predicting regulatory SNPs in immune contexts.
- No clinical data, patient phenotypes, or dopaminergic mechanisms are examined.
Animal models of Parkinson's disease: An updated overview.
Gubellini P, Kachidian P
This review summarizes various animal models used to study Parkinson's disease, including those that disrupt the Nurr1 gene. It does not provide new clinical data or treatment outcomes for children with NR4A2-related syndromes.
- The paper reviews classic and genetic animal models of Parkinson's disease.
- It discusses how these models help understand disease mechanisms and test therapies.
- Nurr1 disruption is mentioned as one method to create specific PD models in animals.
- No human patient data or direct relevance to NR4A2 syndrome treatment is included.
Nurr1 reduction influences the onset of chronic EAE in mice.
Montarolo F, Perga S, Martire S, Bertolotto A
Reducing Nurr1 levels in mice accelerates the onset of an inflammatory disease model and increases spinal cord inflammation. This finding highlights a role for Nurr1 in regulating early immune responses within the central nervous system. The study does not provide evidence on human symptoms, treatment efficacy, or genetic variants relevant to NR4A2 syndrome.
- Nurr1 reduction accelerates disease onset in an inflammatory mouse model.
- Lower Nurr1 levels increase inflammatory cell infiltration in the spinal cord.
- The study uses heterozygous knockout mice, not human patients.
- Results focus on general neuroinflammation mechanisms rather than NR4A2-specific phenotypes.
- No clinical data or treatment implications for humans are presented.
Facilitated Neural Differentiation of Adipose Tissue-Derived Stem Cells by Electrical Stimulation and Nurr-1 Gene Transduction.
Yang Y, Ma T, Ge J, Quan X, Yang L, Zhu S, Huang L, Liu Z, Liu L, Geng D, Huang J, Luo Z
Combining electrical stimulation with Nurr-1 gene delivery improves the differentiation of fat-derived stem cells into neuron-like cells that produce dopamine. This approach increases neuronal markers and neurite growth in a laboratory setting, suggesting potential for future cell-based therapies for neurodegenerative conditions.
- Electrical stimulation combined with Nurr-1 gene transduction enhances stem cell differentiation.
- The treated cells secrete dopamine and express key neuronal markers like MAP-2.
- This is a preclinical study using adipose tissue-derived stem cells in vitro.
- No human trials or clinical data are included in this research.
The Effect of Exposure to Atrazine on Dopaminergic Development in Pubertal Male SD Rats.
Li YS, He X, Ma K, Wu YP, Li BX
Exposure to the herbicide atrazine during puberty reduces dopamine levels and alters key gene expression in the brain regions controlling movement in male rats. This study suggests that environmental toxins can disrupt dopaminergic development, which is relevant to understanding non-genetic factors in parkinsonian symptoms.
- Atrazine exposure lowers dopamine and levodopa levels in rat brains.
- The herbicide reduces expression of Nurr1 and related developmental genes.
- Damage occurs during the pubertal period, a vulnerable developmental window.
- Findings link environmental toxins to dopaminergic system disruption.
MicroRNA-132 promotes estradiol synthesis in ovarian granulosa cells via translational repression of Nurr1.
Wu S, Sun H, Zhang Q, Jiang Y, Fang T, Cui I, Yan G, Hu Y
MicroRNA-132 boosts estrogen production in ovarian cells by turning down Nurr1, a protein that normally suppresses estrogen-making genes. This finding reveals a new regulatory pathway in hormone synthesis, though it is specific to ovarian function and not directly related to NR4A2/NURR1 in the brain or neurodevelopment.
- miR-132 increases estrogen by blocking Nurr1
- Nurr1 normally suppresses estrogen-making genes
- This mechanism is in ovarian cells, not brain or neurons
- No direct link to NR4A2-related neurodevelopmental disorders
- Findings are specific to hormone regulation in ovaries
Production of Nurr-1 Specific Polyclonal Antibodies Free of Cross-reactivity Against Its Close Homologs, Nor1 and Nur77.
Leblanc P, Moon M, Kim W, Jeong I, Kim CH, Kim KS
Researchers developed a protocol to create antibodies that specifically target the Nurr1 protein without reacting with its close relatives, Nur77 and Nor1. This method involves immunizing animals with the unique parts of Nurr1 and then removing any antibodies that bind to the other similar proteins.
- The study creates specific tools for lab research on Nurr1 protein function.
- It does not test treatments or analyze patients with NR4A2 syndromes.
- The work focuses on molecular biology techniques rather than clinical outcomes.
Limitations of In Vivo Reprogramming to Dopaminergic Neurons via a Tricistronic Strategy.
Theodorou M, Rauser B, Zhang J, Prakash N, Wurst W, Schick JA
This study tested a gene therapy approach to turn brain cells into dopamine-producing neurons in mice, but the method caused cell death due to stress and poor protein processing, preventing successful reprogramming. The results highlight major biological hurdles that must be overcome before this strategy could be used to treat Parkinson’s or NR4A2-related conditions.
- A gene combo failed to reprogram brain cells in live mice
- The therapy caused cell death from stress and poor protein cleavage
- Current design cannot safely deliver the needed genes
- Better strategies are needed for in vivo reprogramming
- This approach is not ready for human use
Decreased expression levels of Nurr1 are associated with chronic inflammation in patients with type 2 diabetes.
Xu Y, Huang Q, Zhang W, Wang Y, Zeng Q, He C, Xue J, Chen J, Hu X, Xu Y
This study finds that lower levels of the NR4A2 protein (Nurr1) in white blood cells correlate with higher inflammation and insulin resistance in adults with type 2 diabetes. High glucose and fat levels reduce Nurr1 expression in these cells, suggesting a link between metabolic stress and inflammatory pathways.
- NR4A2 levels drop in white blood cells when exposed to high glucose or fats.
- Low NR4A2 correlates with higher inflammation markers TNFα and IL-6.
- This association links reduced NR4A2 to insulin resistance in type 2 diabetes.
- The study uses human patient samples but focuses on metabolic disease mechanisms.
Adenosine Modulates NR4A Orphan Nuclear Receptors To Attenuate Hyperinflammatory Responses in Monocytic Cells.
Crean D, Cummins EP, Bahar B, Mohan H, McMorrow JP, Murphy EP
This study shows that adenosine regulates NR4A2 to suppress inflammation in immune cells, but it does not address the neurological or developmental aspects of NR4A2-related syndrome. The findings are limited to monocytes and macrophages, with no connection to dopaminergic neurons or human clinical outcomes for this specific genetic condition. Consequently, this research offers no direct insight into treatment or management for a child with an NR4A2 variant.
- Adenosine activates NR4A2 in immune cells to reduce inflammatory cytokine production.
- NR4A2 depletion increases NF-κB activity and hyperinflammation in monocytes.
- The study focuses on innate immunity, not the nervous system.
- No human clinical data or dopaminergic neuron mechanisms are presented.
- Findings do not translate to NR4A2-related syndrome pathophysiology.
Selective ligand activity at Nur/retinoid X receptor complexes revealed by dimer-specific bioluminescence resonance energy transfer-based sensors.
Giner XC, Cotnoir-White D, Mader S, Lévesque D
Researchers developed a new sensor to measure how specific drugs interact with Nur77/RXR and Nurr1/RXR protein complexes. They found that the drug SR11237 selectively activates the Nur77/RXR complex more than other combinations. This tool helps identify compounds that target specific nuclear receptor pairs.
- New BRET sensor measures coactivator recruitment by specific NR dimers.
- SR11237 shows stronger activity on Nur77/RXR than Nurr1/RXR.
- Rexinoids often lack selectivity for specific heterodimer complexes.
- Technology aids in finding compounds with dimer-specific specificity.
FGF23 gene regulation by 1,25-dihydroxyvitamin D: opposing effects in adipocytes and osteocytes.
Kaneko I, Saini RK, Griffin KP, Whitfield GK, Haussler MR, Jurutka PW
The FGF23 gene is turned on by vitamin D in bone cells but turned off in fat cells, due to a specific DNA switch that responds differently depending on the cell type. This switch involves a key protein called Nurr1, which may help explain how vitamin D and calcium regulate FGF23 in the body.
- Vitamin D increases FGF23 in bone cells but decreases it in fat cells
- A DNA region near the FGF23 gene acts as a switch using Nurr1 and vitamin D receptors
- This switch may explain why FGF23 responds differently in various tissues
- Calcium also boosts FGF23 production in bone cells
- The findings reveal how FGF23 is regulated in health and disease
Localization of nuclear receptor subfamily 4, group A, member 3 (NR4A3) in Lewy body disease and multiple system atrophy.
Kon T, Miki Y, Tanji K, Mori F, Tomiyama M, Toyoshima Y, Kakita A, Takahashi H, Utsumi J, Sasaki H, Wakabayashi K
NR4A3 protein accumulates specifically within the abnormal protein clumps found in Parkinson's disease and multiple system atrophy, but not in other neurodegenerative conditions. This suggests NR4A3 is a marker for alpha-synuclein pathology rather than a direct cause of the diseases studied here.
- NR4A3 accumulates in Lewy bodies and glial inclusions in Parkinson's and MSA.
- NR4A3 co-localizes with phosphorylated alpha-synuclein in these disease-specific inclusions.
- NR4A3 is absent in tauopathies, TDP-43 proteinopathies, and polyglutamine diseases.
- The study uses human brain tissue from patients with neurodegenerative disorders.
Age-related gene expression changes in substantia nigra dopamine neurons of the rat.
Parkinson GM, Dayas CV, Smith DW
This study identifies age-related declines in dopamine neuron function in rats, driven by reduced expression of the transcription factor Nurr1 (NR4A2) and altered neurotrophic signaling. These findings suggest that functional changes in dopamine pathways occur independently of cell death during aging.
- Rat substantia nigra dopamine neurons show significant gene expression changes with age.
- Nurr1 expression decreases as rats age, potentially driving functional decline.
- Neurotrophic factor signaling and tyrosine hydroxylase regulation are altered in aging neurons.
- Functional deficits may precede or occur without frank neuron loss.
Microsphere-Incorporated Hybrid Thermogel for Neuronal Differentiation of Tonsil Derived Mesenchymal Stem Cells.
Patel M, Moon HJ, Jung BK, Jeong B
Researchers successfully differentiated tonsil-derived stem cells into neurons using a 3D hydrogel that releases growth factors over time. The system produced high levels of neuronal markers, including Nurr-1, demonstrating a potential method for generating neural tissue in the lab.
- Tonsil stem cells differentiate into neurons within a brain-mimicking 3D hydrogel scaffold.
- Controlled release microspheres deliver growth factors over 12 to 18 days.
- Cells express high levels of Nurr-1 and other neuronal biomarkers.
- The method shows promise for tissue engineering and regenerative medicine applications.
Generation of Dopamine Neurons from Rodent Fibroblasts through the Expandable Neural Precursor Cell Stage.
Lim MS, Chang MY, Kim SM, Yi SH, Suh-Kim H, Jung SJ, Kim MJ, Kim JH, Lee YS, Lee SY, Kim DW, Lee SH, Park CH
Researchers successfully convert mouse skin cells into expandable neural precursor cells that can be directed to become dopamine-producing neurons using specific genetic factors. These engineered neurons function correctly in laboratory settings and show therapeutic potential in rat models of Parkinson's disease.
- Mouse fibroblasts convert into highly expandable neural precursor cells using Wernig factors and Bcl-xL.
- Adding Nurr1 and Foxa2 drives these precursors to mature into functional midbrain dopamine neurons.
- The engineered neurons exhibit presynaptic dopamine functions in vitro.
- Therapeutic potential is assessed in Parkinson disease model rats.
Opposing role for Egr3 in nucleus accumbens cell subtypes in cocaine action.
Chandra R, Francis TC, Konkalmatt P, Amgalan A, Gancarz AM, Dietz DM, Lobo MK
This study investigates how the transcription factor Egr3 regulates behavioral responses to cocaine in specific mouse brain cells, noting that it also influences the expression of NR4A2. The research demonstrates opposing effects of Egr3 depending on whether it acts in dopamine D1 or D2 receptor-expressing neurons. This work focuses entirely on addiction mechanisms in mice and does not address NR4A2-related syndromes or potential treatments for them.
- Egr3 levels change differently in two types of mouse brain cells after cocaine exposure.
- Increasing Egr3 in D1 neurons enhances cocaine reward, while decreasing it in D2 neurons blunts it.
- Cocaine alters Egr3 binding to the NR4A2 gene promoter in specific mouse neurons.
- The study uses mouse models and does not involve human patients or clinical data.
- Findings relate to addiction biology rather than developmental disorders or NR4A2 syndrome.
Association between NR4A2 genetic variation and schizophrenia: A comprehensive systematic review and meta-analysis.
Liu H, Fu Y, Ren J, Yu S, Liu H, Jiang P, Dong Y, Li H
NR4A2 gene variations are not strongly linked to schizophrenia risk based on current evidence, with no significant association found across multiple genetic models in a large review of studies.
- No clear link between NR4A2 variants and schizophrenia risk
- Five variants found only in people with schizophrenia
- Meta-analysis included 3027 participants across seven studies
- Findings suggest need for larger, better-designed studies
- Results do not support NR4A2 as a major schizophrenia risk factor
Nur77 Was Essential for Neurite Outgrowth and Involved in Schwann Cell Differentiation After Sciatic Nerve Injury.
Zhang W, Zhu X, Liu Y, Chen M, Yan S, Mao X, Liu Z, Wu W, Chen C, Xu X, Wang Y
This rat study shows that the protein Nur77 helps peripheral nerves repair themselves after injury by supporting Schwann cell differentiation and axon regeneration. Blocking Nur77 impairs this healing process, highlighting its role in peripheral nerve maintenance rather than central dopaminergic pathways.
- Nur77 levels rise in rat sciatic nerves after injury.
- The protein localizes to both axons and Schwann cells.
- Inhibiting Nur77 reduces Schwann cell myelinization.
- Blocking Nur77 slows axon regeneration in injured nerves.
- This is a peripheral nerve study, not central dopaminergic.
Nuclear Receptor Nr4a2 Promotes Alternative Polarization of Macrophages and Confers Protection in Sepsis.
Mahajan S, Saini A, Chandra V, Nanduri R, Kalra R, Bhagyaraj E, Khatri N, Gupta P
This study demonstrates that the Nr4a2 protein helps regulate immune responses by shifting macrophages toward an anti-inflammatory state, which protects mice from severe sepsis. It identifies a specific mechanism where Nr4a2 directly activates genes associated with this protective immune phenotype.
- Nr4a2 induces an anti-inflammatory macrophage phenotype in response to inflammatory signals.
- The protein directly binds to and activates the arginase 1 gene promoter.
- Increasing Nr4a2 levels improves survival rates in mouse models of sepsis.
- This research focuses on innate immunity rather than dopaminergic neuron function.
Age-dependent Müller glia neurogenic competence in the mouse retina.
Löffler K, Schäfer P, Völkner M, Holdt T, Karl MO
This study shows that mouse Müller glia cells can be reprogrammed to generate new neurons in a lab dish, but this ability declines as the animal ages. The regenerated cells resemble amacrine neurons rather than photoreceptors, and most progeny do not fully mature into functional neurons.
- Mouse Müller glia regenerate neurons only in juvenile stages, not older mice.
- Regenerated cells express neuronal markers but likely become amacrine-like cells.
- Most regenerated cells remain in a de-differentiated state rather than fully maturing.
- This model helps study limits of mammalian retinal regeneration.
- Findings are specific to retinal biology and unrelated to NR4A2 motor symptoms.
Epigenetic regulation contributes to urocortin-enhanced midbrain dopaminergic neuron differentiation.
Huang HY, Chiu TL, Chang HF, Hsu HR, Pang CY, Liew HK, Wang MJ
Urocortin promotes the differentiation of midbrain dopaminergic neurons in rat brain tissue and cell cultures by modifying chromatin structure to increase the expression of key developmental genes. This process involves inhibiting histone deacetylases, which releases repressor complexes from gene promoters, thereby enhancing the transcription of factors like Nurr1 and Tyrosine Hydroxylase.
- Urocortin increases dopaminergic neuron numbers in rat midbrain precursor cultures.
- The mechanism involves epigenetic modification via histone deacetylation inhibition.
- UCN enhances expression of Nurr1, Foxa2, and Pitx3 transcription factors.
- In vivo rat studies confirm increased dopaminergic neuron differentiation with UCN treatment.
Neural Progenitor Cells Derived from Human Embryonic Stem Cells as an Origin of Dopaminergic Neurons.
Noisa P, Raivio T, Cui W
Researchers successfully generate midbrain dopaminergic neurons from human embryonic stem cells using specific chemical signals. This method provides a scalable source of these neurons for potential cell-based therapies in neurodegenerative diseases like Parkinson's.
- Human embryonic stem cells differentiate into neural progenitors using Dorsomorphin.
- These progenitors further develop into dopaminergic neurons with midbrain identity markers.
- The process uses FGF8 and SHH to induce specific neuronal subtypes.
- This technique offers an unlimited cell source for potential Parkinson's disease treatments.
The neuron-derived orphan receptor 1 (NOR1) is induced upon human alternative macrophage polarization and stimulates the expression of markers of the M2 phenotype.
De Paoli F, Eeckhoute J, Copin C, Vanhoutte J, Duhem C, Derudas B, Dubois-Chevalier J, Colin S, Zawadzki C, Jude B, Haulon S, Lefebvre P, Staels B, Chinetti-Gbaguidi G
NOR1 is a protein that increases in human macrophages when they become anti-inflammatory (M2), and it helps turn on genes that support this protective state. Silencing NOR1 reduces key anti-inflammatory markers, showing it plays a direct role in regulating macrophage function in human tissues.
- NOR1 increases in human anti-inflammatory macrophages
- NOR1 boosts expression of anti-inflammatory genes
- Reducing NOR1 weakens the protective macrophage state
- NOR1 may regulate genes involved in tissue repair
- Findings are specific to human macrophages, not mice
Nuclear receptor 4A (NR4A) family - orphans no more.
Safe S, Jin UH, Morpurgo B, Abudayyeh A, Singh M, Tjalkens RB
This review describes the NR4A family of proteins as regulators of cellular stress and homeostasis with potential roles in neurological, metabolic, and inflammatory diseases. It highlights that while natural ligands are unknown, synthetic molecules can activate these receptors, suggesting future therapeutic opportunities for conditions like neurodegeneration.
- NR4A1, NR4A2, and NR4A3 regulate cellular stress responses and homeostasis.
- These receptors influence neurological, metabolic, cardiovascular, and immune functions.
- Synthetic molecules can act as agonists or antagonists for these receptors.
- Future drugs targeting NR4A may treat neurologic and inflammatory diseases.
The Nurr1 Activator 1,1-Bis(3'-Indolyl)-1-(p-Chlorophenyl)Methane Blocks Inflammatory Gene Expression in BV-2 Microglial Cells by Inhibiting Nuclear Factor κB.
De Miranda BR, Popichak KA, Hammond SL, Jorgensen BA, Phillips AT, Safe S, Tjalkens RB
A synthetic compound called C-DIM12 reduces inflammatory gene expression in microglial cells by activating the NR4A2 (Nurr1) protein. This activation prevents the binding of pro-inflammatory factors to DNA, thereby suppressing the release of inflammatory signals.
- C-DIM12 activates Nurr1 to inhibit inflammatory genes in microglia.
- The effect disappears when Nurr1 is removed, confirming its role.
- The compound stabilizes corepressor proteins that block inflammation.
- This study uses only cell cultures, not animals or humans.
Chronic Toxoplasma gondii in Nurr1-null heterozygous mice exacerbates elevated open field activity.
Eells JB, Varela-Stokes A, Guo-Ross SX, Kummari E, Smith HM, Cox AD, Lindsay DS
In mice with one copy of the Nurr1 gene, a common parasitic infection worsens hyperactivity and alters fear responses. This suggests that environmental factors like infection can exacerbate behavioral symptoms in individuals with NR4A2 variations by affecting dopamine pathways.
- Toxoplasma gondii infection increases open field activity in mice with one Nurr1 copy.
- The hyperactivity effect is significantly worse in heterozygous mice compared to normal mice.
- Infection abolishes fear of predators in normal mice but only partially affects mutant males.
- Antibody levels correlate with behavioral changes, showing an inverted U-shaped relationship.
- Results link Nurr1 deficiency and infection to dopamine-related behavioral alterations.
Expression analysis of the long non-coding RNA antisense to Uchl1 (AS Uchl1) during dopaminergic cells' differentiation in vitro and in neurochemical models of Parkinson's disease.
Carrieri C, Forrest AR, Santoro C, Persichetti F, Carninci P, Zucchelli S, Gustincich S
The study shows that Nurr1 regulates a specific RNA molecule (AS Uchl1) that helps produce the UCHL1 protein, which is often reduced in Parkinson's disease. This RNA is down-regulated in Parkinson's models, suggesting it is part of the stress response in dopaminergic neurons.
- Nurr1 directly regulates AS Uchl1 RNA levels in dopaminergic cells.
- AS Uchl1 increases translation of UCHL1, a protein linked to Parkinson's.
- AS Uchl1 levels drop significantly in Parkinson's disease models.
- This links Nurr1 biology to UCHL1 regulation and cellular stress.
NR4A receptors up-regulate the antiproteinase alpha-2 macroglobulin (A2M) and modulate MMP-2 and MMP-9 in vascular smooth muscle cells.
Rodríguez-Calvo R, Ferrán B, Alonso J, Martí-Pàmies I, Aguiló S, Calvayrac O, Rodríguez C, Martínez-González J
NR4A receptors regulate vascular health by increasing alpha-2 macroglobulin, which inhibits enzymes that remodel tissue. This mechanism operates in blood vessel cells and involves direct transcriptional control of the A2M gene.
- NR4A receptors up-regulate alpha-2 macroglobulin in vascular smooth muscle cells.
- Increased A2M leads to decreased activity of MMP-2 and MMP-9 enzymes.
- The study focuses on vascular biology, not neurological development or function.
- No findings relate to NR4A2-related neurodevelopmental syndromes or treatments.
Activation of Mouse Cumulus-Oocyte Complex Maturation In Vitro Through EGF-Like Activity of Versican.
Dunning KR, Watson LN, Zhang VJ, Brown HM, Kaczmarek AK, Robker RL, Russell DL
Versican, a protein found in healthy mouse egg cells, acts like EGF to support egg maturation in the lab, with unique timing and gene effects that may improve egg quality. It boosts key genes involved in egg development and maintains their activity longer than EGF alone.
- Versican mimics EGF to help egg cells mature in the lab
- It boosts genes linked to egg quality and expansion
- Versican works longer and differently than EGF
- Its effects match those seen in natural egg development
- May improve in vitro egg maturation techniques
Apoptosis Signal-regulating Kinase 1 (ASK1)-p38 Pathway-dependent Cytoplasmic Translocation of the Orphan Nuclear Receptor NR4A2 Is Required for Oxidative Stress-induced Necrosis.
Watanabe T, Sekine S, Naguro I, Sekine Y, Ichijo H
This study identifies a specific cellular mechanism where oxidative stress triggers NR4A2 to move from the nucleus to the cytoplasm, promoting cell death through a non-apoptotic necrotic pathway. The findings clarify how NR4A2 functions in stress responses but do not provide evidence for clinical treatment or human outcomes.
- NR4A2 promotes oxidative stress-induced necrosis via ASK1-p38 signaling.
- Phosphorylation causes NR4A2 to translocate from nucleus to cytoplasm.
- This cell death pathway is independent of caspases and RIP kinases.
- The research focuses on molecular mechanisms in cell lines, not humans.
Retinoic acid-loaded polymeric nanoparticles induce neuroprotection in a mouse model for Parkinson's disease.
Esteves M, Cristóvão AC, Saraiva T, Rocha SM, Baltazar G, Ferreira L, Bernardino L
Retinoic acid delivered via nanoparticles protects dopamine-producing neurons in a mouse model of Parkinson's disease. The treatment reduces neuron loss and increases the expression of Nurr1, a protein related to NR4A2 function.
- The study uses a mouse model, not human patients or clinical trials.
- Retinoic acid nanoparticles protect dopamine neurons from damage in mice.
- Treatment increases Nurr1 levels, supporting neuron survival and function.
- This is preclinical research with no direct evidence for NR4A2 syndrome treatment.