Point mutations in exon 1 of the NR4A2 gene are not a major cause of familial Parkinson's disease.
Zimprich A, Asmus F, Leitner P, Castro M, Bereznai B, Homann N, Ott E, Rutgers AW, Wieditz G, Trenkwalder C, Gasser T
Point mutations in exon 1 of the NR4A2 gene are not a common cause of familial Parkinson's disease, suggesting that this specific genetic change is unlikely to be responsible for inherited cases of the condition.
- NR4A2 exon 1 mutations are not a major cause of familial Parkinson's
- These mutations are rare in inherited Parkinson's cases
- Other genetic factors likely play bigger roles in familial Parkinson's
Parathyroid hormone induces the nuclear orphan receptor NOR-1 in osteoblasts.
Pirih FQ, Nervina JM, Pham L, Aghaloo T, Tetradis S
Parathyroid hormone triggers the production of a protein called NOR-1 in bone-forming cells, primarily through a specific signaling pathway involving cAMP and PKA. This finding shows how PTH influences bone cell activity at the genetic level.
- PTH turns on the NOR-1 gene in bone cells
- NOR-1 is part of a family of genes linked to brain and development
- The effect is driven by cAMP-PKA signaling, not calcium or PKC
- NOR-1 is a direct target of PTH, not dependent on new protein synthesis
- This pathway may influence bone growth and remodeling
Expression of depolarization-induced immediate early gene proteins in PC12 cells.
Liu W, Feldman JD, Machado HB, Vician LJ, Herschman HR
This study measures how quickly specific proteins, including Nurr-1, appear in rat pheochromocytoma cells after chemical stimulation. It provides basic timing data on protein synthesis but offers no insight into human disease mechanisms or treatment options.
- Researchers tracked four immediate early gene proteins in PC12 rat cells.
- Nurr-1 protein levels peaked between two and four hours post-stimulation.
- Other proteins like PIM-1, KID-1, and SIK showed distinct timing patterns.
- The study uses only cell lines with no human or animal disease models.
Sonic hedgehog and FGF8 collaborate to induce dopaminergic phenotypes in the Nurr1-overexpressing neural stem cell.
Kim TE, Lee HS, Lee YB, Hong SH, Lee YS, Ichinose H, Kim SU, Lee MA
This study demonstrates that combining Nurr1 overexpression with specific growth factors (Shh and FGF8) directs mouse neural stem cells to become dopaminergic neurons in a laboratory setting. The authors propose this method could generate unlimited dopamine-producing cells for potential future cell replacement therapies in Parkinson's disease.
- Nurr1 overexpression primes mouse stem cells to respond to Shh and FGF8 signals.
- The combination induces midbrain dopaminergic phenotypes in immortalized neural stem cells.
- Findings rely entirely on mouse cell lines, not human patients or clinical data.
- The work focuses on basic mechanisms of neuron specification rather than treatment outcomes.
Dopaminergic neuronal differentiation from rat embryonic neural precursors by Nurr1 overexpression.
Kim JY, Koh HC, Lee JY, Chang MY, Kim YC, Chung HY, Son H, Lee YS, Studer L, McKay R, Lee SH
Overexpressing Nurr1 in rat brain precursor cells induces some dopaminergic features in a dish, but the resulting cells are immature and fail to function or improve behavior when transplanted into living animals. This study confirms that Nurr1 alone is insufficient to create fully functional dopamine neurons for therapy, highlighting the need for additional factors. These findings do not provide direct evidence for treating NR4A2-related syndromes in humans.
- Nurr1 induces immature dopaminergic markers in rat precursor cells in vitro.
- Transplanted cells show limited survival and no functional improvement in animal models.
- The study uses rat embryonic precursors, not human tissue or patients.
- Results indicate Nurr1 alone cannot generate fully functional dopamine neurons for therapy.
Midbrain dopaminergic neurons: determination of their developmental fate by transcription factors.
Simon HH, Bhatt L, Gherbassi D, Sgadó P, Alberí L
This review outlines the specific sequence of transcription factors, including Nurr1 (NR4A2), that guide midbrain dopaminergic neurons to develop and survive. It establishes that Nurr1 is essential for expressing the dopamine-producing phenotype and regulating related genes, while other factors like Engrailed-1/2 are required for long-term survival.
- Nurr1 drives the expression of genes needed for dopamine synthesis and transport.
- Engrailed-1 and -2 are critical for the survival of these neurons after they form.
- The paper reviews general developmental biology without testing treatments or human outcomes.
- It does not address NR4A2 mutations, specific patient phenotypes, or clinical interventions.
Transcriptional control of dopamine neuron development.
Wallén A, Perlmann T
This review outlines the genetic roadmap for developing dopamine neurons, highlighting Nurr1 (NR4A2) as a key factor alongside others like Lmx1b and Pitx3. It explains how understanding these factors helps scientists engineer dopamine cells from stem cells in the lab.
- Nurr1 is one of several transcription factors essential for postmitotic dopamine neuron development.
- Early dopamine progenitor identity relies on sonic hedgehog and FGF8 signals.
- Lab-engineered dopamine neurons use this genetic knowledge for potential Parkinson's therapies.
Transcription factors in the development of midbrain dopamine neurons.
Burbach JP, Smits S, Smidt MP
This review explains that midbrain dopamine neurons require two distinct transcription factor cascades to develop and survive. It highlights Nurr1 (NR4A2) as essential for producing dopamine and other genes like Lmx1b and Ptx3 for structural formation.
- Nurr1 is required for synthesizing the neurotransmitter dopamine in midbrain neurons.
- Homeobox genes like Lmx1b and Engrailed drive early development and survival.
- Ptx3 induction coincides with dopamine enzyme production and substantia nigra formation.
- Both transcription factor cascades are necessary for neuron survival during development.
Decreased ethanol preference and wheel running in Nurr1-deficient mice.
Werme M, Hermanson E, Carmine A, Buervenich S, Zetterström RH, Thorén P, Ogren SO, Olson L, Perlmann T, Brené S
Mice with one copy of the Nurr1 gene show reduced interest in ethanol and less compulsive wheel running compared to normal mice. This suggests that lower levels of this protein may decrease reward-seeking behaviors, but these findings are based solely on animal models.
- Heterozygous Nurr1 deficiency reduces ethanol consumption in adult mice.
- Reduced Nurr1 levels also decrease compulsive wheel running behavior.
- The study links Nurr1 to the reinforcing properties of rewards.
- Genetic mapping identifies Nurr1 as a candidate for ethanol preference traits.
- All evidence comes from mouse models, not human patients.
Structure and function of Nurr1 identifies a class of ligand-independent nuclear receptors.
Wang Z, Benoit G, Liu J, Prasad S, Aarnisalo P, Liu X, Xu H, Walker NP, Perlmann T
This study reveals that the Nurr1 protein lacks a binding pocket for small molecules, meaning it functions without traditional chemical triggers. The research focuses on the physical structure of the protein rather than its role in disease or potential treatments.
- Nurr1 is a ligand-independent nuclear receptor with no cavity for small molecule binding.
- The protein structure differs from typical receptors that rely on ligand activation.
- Transcriptional activity correlates with the stability of the Nurr1 protein structure.
- This work defines a new structural class of nuclear receptors without clinical implications.
Parkinson's disease: piecing together a genetic jigsaw.
Dekker MC, Bonifati V, van Duijn CM
This review discusses the genetic causes of Parkinson's disease, noting that mutations in NR4A2 disrupt a specific signaling pathway. It highlights that while these genetic insights help explain familial cases, the mechanisms for common late-onset Parkinson's remain unclear due to gene-environment interactions.
- NR4A2 mutations affect a distinct signaling pathway in Parkinson's disease.
- Parkinson's genetics involve complex networks beyond simple protein aggregation.
- Common Parkinson's likely results from gene and environment interactions.
- The paper reviews monogenic forms and their population consequences.
Orphan nuclear receptor Nurr1 directly transactivates the promoter activity of the tyrosine hydroxylase gene in a cell-specific manner.
Kim KS, Kim CH, Hwang DY, Seo H, Chung S, Hong SJ, Lim JK, Anderson T, Isacson O
This study identifies the specific DNA binding sites on the tyrosine hydroxylase gene that Nurr1 uses to activate dopamine production in neurons. It confirms that Nurr1 directly controls this key enzyme but does not regulate the related noradrenergic pathway.
- Nurr1 directly activates the tyrosine hydroxylase gene promoter in dopaminergic cells.
- Three specific binding motifs (NL1, NL2, NL3) mediate this activation.
- NL3 shows the highest binding affinity to Nurr1 despite NL1 being critical for function.
- Nurr1 does not regulate the dopamine beta-hydroxylase promoter.
- This mechanism specifies dopamine neurotransmitter identity in developing neurons.
Regulation of NGFI-B expression during the ovulatory process.
Park JI, Park HJ, Lee YI, Seo YM, Chun SY
This study examines how the hormone LH regulates NGFI-B (NR4A2) and related genes in rat and human ovarian cells during ovulation. It identifies specific signaling pathways involved in this reproductive process but provides no information on neurodevelopment, brain function, or potential treatments for NR4A2-related syndromes.
- LH triggers rapid NGFI-B expression in rat and human ovarian granulosa cells.
- This induction requires protein kinase Czeta signaling pathways.
- Related genes Nurr1 and Nor1 also respond to LH stimulation.
- The research focuses solely on reproductive biology, not neurological function.
- No clinical data or therapeutic implications for NR4A2 disorders are presented.
The AF-1 domain of the orphan nuclear receptor NOR-1 mediates trans-activation, coactivator recruitment, and activation by the purine anti-metabolite 6-mercaptopurine.
Wansa KD, Harris JM, Yan G, Ordentlich P, Muscat GE
This study details the molecular mechanics of how the NOR-1 protein activates genes and responds to specific drugs in cell cultures. It identifies that a specific protein domain drives this activation and demonstrates that the chemotherapy drug 6-mercaptopurine can trigger this pathway. The findings suggest these proteins act as sensors for cellular stress caused by DNA damage.
- NOR-1 activates genes through its N-terminal AF-1 domain, not its ligand-binding domain.
- The drug 6-mercaptopurine directly activates NOR-1 in cell culture experiments.
- Other similar anti-metabolite drugs also activate this specific protein pathway.
- Researchers hypothesize NR4A proteins sense genotoxic stress from DNA damage.
- The study uses molecular biology techniques on cells, not human patients or animals.
Identification of the antineoplastic agent 6-mercaptopurine as an activator of the orphan nuclear hormone receptor Nurr1.
Ordentlich P, Yan Y, Zhou S, Heyman RA
The leukemia drug 6-mercaptopurine activates the NR4A2 protein in laboratory settings. This finding suggests a new biological mechanism for how the drug works but does not indicate it is a treatment for NR4A2-related syndromes.
- 6-mercaptopurine activates NR4A2 via its amino terminus in cell studies.
- The drug is currently used for leukemia and Crohn's disease, not NR4A2 syndrome.
- This mechanism explains antiproliferative effects, not therapeutic benefit for neurodevelopment.
- No clinical trials target NR4A2 activation using this drug.
The human tyrosine hydroxylase gene promoter.
Kessler MA, Yang M, Gollomp KL, Jin H, Iacovitti L
This study maps the regulatory DNA region controlling tyrosine hydroxylase, the enzyme that makes dopamine, and identifies binding sites for NR4A2 (Nurr1) within it. It confirms that NR4A2 directly interacts with the tyrosine hydroxylase promoter in a conserved manner across humans and rodents. This provides molecular evidence for how NR4A2 regulates dopamine production but offers no direct clinical guidance or treatment options.
- NR4A2 binding sites exist within the human tyrosine hydroxylase gene promoter.
- These regulatory regions are highly conserved between humans, mice, and rats.
- The study uses transgenic mice to validate promoter activity in dopamine-producing cells.
- No human clinical data or patient outcomes are reported.
Distribution of haplotypes derived from three common variants of the NR4A2 gene in Japanese patients with schizophrenia.
Iwayama-Shigeno Y, Yamada K, Toyota T, Shimizu H, Hattori E, Yoshitsugu K, Fujisawa T, Yoshida Y, Kobayashi T, Toru M, Kurumaji A, Detera-Wadleigh S, Yoshikawa T
This study found no strong link between common variations in the NR4A2 gene and schizophrenia in Japanese patients, suggesting NR4A2 is unlikely to be a major genetic risk factor for schizophrenia in this population.
- No significant genetic link found between NR4A2 variants and schizophrenia
- Three common NR4A2 gene variants were studied together
- Haplotypes from these variants showed no association with the disease
- Results suggest NR4A2 is not a major risk factor for schizophrenia in Japanese people
Dimer-specific potentiation of NGFI-B (Nur77) transcriptional activity by the protein kinase A pathway and AF-1-dependent coactivator recruitment.
Maira M, Martens C, Batsché E, Gauthier Y, Drouin J
This study details the molecular mechanism by which stress hormones activate NR4A2 family proteins in cells, showing that they must form pairs to function and that specific chemical signals enhance this pairing. It does not involve human patients or clinical outcomes for NR4A2-related syndromes.
- NR4A2 proteins require dimerization to bind DNA and activate gene transcription.
- Stress hormone signaling enhances the activity of these protein pairs via PKA.
- Coactivators recruit to dimers but not monomers to boost transcriptional output.
- The AF-1 domain mediates this potentiation mechanism in cell models.
Hzf-3 expression in the amygdala after establishment of conditioned taste aversion.
Ge H, Chiesa R, Peña de Ortiz S
This study shows that the NR4A2 protein increases in a specific part of the rat brain when they learn to avoid a bad taste. It suggests this protein helps process negative experiences but does not provide information on human development or treatment.
- NR4A2 levels rise in the rat amygdala during associative learning.
- The protein responds only when stimuli are paired together.
- Findings relate to basic brain function, not NR4A2 syndrome.
- No human data or clinical implications are presented.
The constitutive and inducible expression of Nurr1, a key regulator of dopaminergic neuronal differentiation, in human neural and non-neural cell lines.
Satoh J, Kuroda Y
This study confirms that Nurr1 mRNA is present in various human cell lines and increases when neurons are stimulated, but it fails to show that Nurr1 directly activates key genes involved in dopamine production or survival in the tested cells. The findings suggest that additional factors are required for Nurr1 to function effectively in regulating these genetic pathways. This work provides basic molecular context but offers no direct clinical insights or treatment options for NR4A2-related syndrome.
- Nurr1 mRNA is found in many human neural and non-neural cell lines.
- Stimulation of differentiated neurons increases Nurr1, NGFI-B, and NOR-1 levels.
- Overexpressing Nurr1 does not significantly change expression of 27 tested target genes.
- Effective transcriptional activation likely requires additional coactivators in precursor cells.
Overexpression of midbrain-specific transcription factor Nurr1 modifies susceptibility of mouse neural stem cells to neurotoxins.
Lee MA, Lee HS, Lee HS, Cho KG, Jin BK, Sohn S, Lee YS, Ichinose H, Kim SU
Overexpressing the Nurr1 protein in mouse neural stem cells alters how these cells respond to specific neurotoxins, increasing vulnerability to one toxin while decreasing it for another. This suggests that Nurr1 levels influence which cell death pathways are activated during neurotoxic stress.
- Nurr1 overexpression increases sensitivity to the neurotoxin 6-OHDA in mouse stem cells.
- Nurr1 overexpression decreases sensitivity to the neurotoxin MPP+ in mouse stem cells.
- The study uses cell lines, not human patients or clinical data.
- Findings relate to Parkinson's disease mechanisms, not NR4A2 syndrome treatment.
Regulation of synaptic plasticity genes during consolidation of fear conditioning.
Ressler KJ, Paschall G, Zhou XL, Davis M
This study identifies changes in gene expression within the amygdala and other brain regions during the consolidation of fear memories. It highlights that Nurr1 levels increase hours after learning, suggesting a role in long-term memory formation rather than immediate response.
- Fear memory consolidation involves broad neural circuits beyond just the amygdala.
- Nurr1 expression increases 2-4 hours after fear conditioning events.
- Gene regulation occurs only when stimuli support actual behavioral learning.
- The study focuses on synaptic plasticity mechanisms in mammalian brains.
Reduced adrenal activation in a rat line selected for high alcohol sensitivity.
Raatesalmi K, Virtanen A, Sarviharju M, Pelto-Huikko And M, Korpi ER
This study finds that rats bred for high alcohol sensitivity show reduced activation of adrenal genes, including Nurr1, in response to alcohol and stress. The research uses animal models to explore biological mechanisms related to alcohol sensitivity rather than investigating NR4A2-related syndromes or potential treatments.
- Rats with high alcohol sensitivity exhibit blunted adrenal gene activation.
- Nurr1 expression is significantly lower in sensitive rats after alcohol exposure.
- The study focuses on animal models of alcohol sensitivity, not human genetics.
- No findings relate to NR4A2 variants or clinical outcomes for affected children.
Age-related decreases in Nurr1 immunoreactivity in the human substantia nigra.
Chu Y, Kompoliti K, Cochran EJ, Mufson EJ, Kordower JH
Nurr1 levels and dopamine-producing neuron markers decline significantly in the human substantia nigra as people age. This reduction parallels the natural loss of dopamine neurons but does not indicate accelerated cell death, suggesting it is a normal part of aging rather than a disease process.
- Nurr1-positive neurons decrease by 23% in middle age and 46% in old age.
- Dopamine neuron markers decline at the same rate as Nurr1 levels.
- Other neuron types remain stable, indicating specific dopaminergic changes.
- Findings reflect normal phenotypic aging, not neurodegeneration.
Exclusion of the Nurr1 gene in autosomal recessive Parkinson's disease.
Rawal N, Periquet M, Dürr A, de Michele G, Bonifati V, Teive HA, Raskin S, Guimaraes J, Agid Y, Brice A, French Parkinson's Disease Genetics Study Group, European Consortium on Genetic Susceptibility in Parkinson's Disease
This study found no evidence that mutations in the Nurr1 gene cause autosomal recessive Parkinson's disease, suggesting that Nurr1 is not a primary genetic cause of this specific form of Parkinson's.
- Nurr1 gene not linked to recessive Parkinson's disease
- No disease-causing mutations found in Nurr1
- Nurr1 unlikely to be a major cause of recessive Parkinson's
Defining requirements for heterodimerization between the retinoid X receptor and the orphan nuclear receptor Nurr1.
Aarnisalo P, Kim CH, Lee JW, Perlmann T
This study identifies the specific structural regions required for Nurr1 to form complexes with RXR, showing that disrupting this partnership does not impair Nurr1's ability to function as a single unit. The findings clarify how Nurr1 interacts with other proteins but do not provide direct evidence for treating NR4A2-related syndromes in humans.
- Nurr1 functions normally as a monomer even when it cannot bind RXR.
- Specific amino acid changes can block heterodimerization without affecting monomeric activity.
- RXR interaction reduces the baseline transcriptional activity of Nurr1.
- The study maps structural requirements for protein-protein interactions in vitro.
- No human clinical data or therapeutic outcomes are reported.
Requirements for heterodimerization between the orphan nuclear receptor Nurr1 and retinoid X receptors.
Sacchetti P, Dwornik H, Formstecher P, Rachez C, Lefebvre P
This study defines the molecular mechanics of how the NR4A2 protein interacts with other receptors to regulate gene expression in dopamine-producing neurons. It establishes that NR4A2 can function independently and details the specific structural requirements for its heterodimerization with retinoid X receptors.
- NR4A2 activates genes without needing RXR partners or its AF2 domain.
- RXR binding to DNA is a strict requirement for NR4A2 heterodimer formation.
- Specific spacing of NR4A2 binding sites controls retinoid-induced transcriptional activity.
Activation and induction of NUR77/NURR1 in corticotrophs by CRH/cAMP: involvement of calcium, protein kinase A, and MAPK pathways.
Kovalovsky D, Refojo D, Liberman AC, Hochbaum D, Pereda MP, Coso OA, Stalla GK, Holsboer F, Arzt E
This study maps the cellular signaling pathways that activate NURR1 in pituitary cells, showing it relies on calcium and MAPK mechanisms. It does not investigate NR4A2-related movement disorders or potential treatments for children.
- Research focuses on pituitary corticotrophs, not dopaminergic neurons relevant to NR4A2 syndrome.
- Study uses mouse cell lines (AtT-20), providing no human clinical evidence.
- No connection to motor symptoms, levodopa response, or gene therapy for NR4A2.
- Details molecular pathways like PKA and MAPK in unrelated endocrine tissue.
Dopaminergic differentiation of the Nurr1-expressing immortalized mesencephalic cell line CSM14.1 in vitro.
Haas SJ, Wree A
This study demonstrates that rat mesencephalic progenitor cells can differentiate into dopaminergic neurons in a laboratory dish. The researchers observed the upregulation of key enzymes associated with mature dopaminergic neurons during this process.
- The study uses immortalized rat embryonic cells, not human cells or patient data.
- It confirms in vitro differentiation into dopaminergic neurons using standard lab markers.
- No genetic link to NR4A2 syndrome or human clinical outcomes is established.
- The work serves as a basic biological model for cell development.
Nurr1 affects pRL-TK but not phRG-B internal control plasmid in genetic reporter system.
Matuszyk J, Ziolo E, Cebrat M, Kochel I, Strzadala L
This study identifies a technical flaw in common laboratory assays where the NR4A2 protein (Nurr1) artificially increases the signal of a standard control plasmid, potentially leading to incorrect scientific conclusions. It recommends using an alternative control plasmid (phRG-B) to avoid this interference in future experiments. This finding is strictly methodological and does not provide new information about disease mechanisms or treatments for patients.
- NR4A2 protein artificially boosts the signal of the pRL-TK control plasmid in lab assays.
- This interference causes misinterpretation of experimental results regarding gene transcription.
- The phRG-B plasmid serves as a more reliable internal control for these tests.
- NR4A2 does not affect the Fas Ligand promoter-driven transcription in this context.
The activation function-1 domain of Nur77/NR4A1 mediates trans-activation, cell specificity, and coactivator recruitment.
Wansa KD, Harris JM, Muscat GE
This study details the molecular mechanics of how the related protein Nur77 activates gene expression, focusing on its structural domains and interaction with coactivators. It provides no data on NR4A2/Nurr1 function in humans, clinical outcomes, or potential treatments for NR4A2-related syndromes.
- The research focuses exclusively on Nur77 (NR4A1), not the target gene NR4A2.
- It describes basic molecular biology mechanisms of transcription factor activation.
- No human data, patient phenotypes, or clinical trial results are included.
- Findings do not suggest immediate therapeutic avenues for NR4A2 disorders.
Corticotropin-releasing hormone signaling in synovial tissue vascular endothelium is mediated through the cAMP/CREB pathway.
McEvoy AN, Bresnihan B, Fitzgerald O, Murphy EP
This study investigates how inflammatory signals affect blood vessels in arthritic joints, finding that the NURR1 protein is present in these tissues alongside its activator. The research demonstrates a specific molecular pathway where inflammation triggers NURR1 production in joint endothelial cells via cAMP signaling. This work focuses entirely on peripheral joint inflammation and vascular biology rather than central nervous system development or dopaminergic function.
- NURR1 and its activator CRH are found in synovial lining and blood vessels of arthritic joints.
- Inflammatory signals activate NURR1 gene expression through the cAMP/CREB pathway in endothelial cells.
- The study uses human rheumatoid arthritis tissue samples to map protein locations.
- Findings link peripheral inflammation mechanisms to NURR1 regulation in joint vasculature.
- No connection is established between these findings and NR4A2-related neurodevelopmental syndromes.
Serum response factor: discovery, biochemistry, biological roles and implications for tissue injury healing.
Chai J, Tarnawski AS
This paper discusses serum response factor (SRF), a protein that controls genes involved in cell growth, nerve function, and muscle development. It does not focus on NR4A2 or related disorders and provides no direct insights into NR4A2-related syndrome or potential treatments.
- SRF regulates genes for cell growth, nerves, and muscles
- SRF is activated by various signals like stress and inflammation
- SRF is vital for heart development and function
- No connection to NR4A2 or related neurodevelopmental conditions
- Findings are not relevant to NR4A2-related syndrome
Decreased expression of the transcription factor NURR1 in dopamine neurons of cocaine abusers.
Bannon MJ, Pruetz B, Manning-Bog AB, Whitty CJ, Michelhaugh SK, Sacchetti P, Granneman JG, Mash DC, Schmidt CJ
Chronic cocaine use significantly reduces the levels of the NURR1 protein and its target, the dopamine transporter, in human brain cells. This finding demonstrates that environmental factors can downregulate NR4A2-dependent pathways in humans, distinct from genetic causes.
- Cocaine abuse lowers NURR1 expression in human dopamine neurons.
- Reduced NURR1 leads to decreased dopamine transporter levels.
- This study confirms NURR1 regulates human DAT gene expression in vivo.
- Findings relate to environmental adaptation, not genetic NR4A2 syndrome.