Forskolin cooperating with growth factor on generation of dopaminergic neurons from human fetal mesencephalic neural progenitor cells.
Wang X, Li X, Wang K, Zhou H, Xue B, Li L, Wang X
Forskolin enhances the production of dopamine-producing neurons from human fetal stem cells when combined with FGF8. This combination increases the yield of mature dopaminergic neurons that express key markers like Nurr1 and tyrosine hydroxylase. The study suggests this method could improve cell therapies for neurodegenerative diseases.
- Forskolin boosts FGF8-driven generation of dopamine neurons from human fetal stem cells.
- Treated cells produce dopamine and express Nurr1, TH, and D2 receptor genes.
- The approach aims to improve cell replacement therapies for neurodegenerative conditions.
GDNF promotes neuronal differentiation and dopaminergic development of mouse mesencephalic neurospheres.
Roussa E, Krieglstein K
GDNF drives mouse stem cells to become dopaminergic neurons in a laboratory dish. This finding confirms basic biological mechanisms but provides no direct evidence for treating human patients with NR4A2-related syndromes.
- The study uses mouse embryonic stem cells, not human tissue or patients.
- GDNF increases the number of cells expressing early dopaminergic markers.
- No clinical outcomes, safety data, or human trials are reported.
- Results describe molecular pathways without immediate therapeutic application.
Synaptotagmin IV overexpression inhibits depolarization-induced exocytosis in PC12 cells.
Machado HB, Liu W, Vician LJ, Herschman HR
Overexpressing synaptotagmin IV in PC12 cells reduces the release of neurotransmitter-like molecules in response to electrical stimulation, likely by interfering with calcium-triggered vesicle fusion. This effect depends on a specific amino acid change in synaptotagmin IV that prevents it from binding to cell membranes properly.
- Synaptotagmin IV blocks neurotransmitter release when overexpressed
- Its inhibitory effect relies on a unique serine in its calcium-binding site
- Changing serine to aspartate removes the inhibition
- Other immediate-early genes tested had no effect on exocytosis
- This suggests synaptotagmin IV may regulate synaptic signaling
Over-expression of bHLH genes facilitate neural formation of mouse embryonic stem (ES) cells in vitro.
Kanda S, Tamada Y, Yoshidome A, Hayashi I, Nishiyama T
Forcing mouse stem cells to express specific neural genes rapidly creates early nerve cells and some dopamine-producing neurons in a petri dish. This study shows how basic genetic switches can drive initial brain cell formation but does not test treatments or analyze human patients with NR4A2 mutations. The findings describe general developmental biology rather than offering insights into the specific syndrome or potential therapies for your child.
- Mouse stem cells differentiate into nerve cells faster when forced to express NeuroD2 or Mash1 genes.
- The treated cells show markers of early neural development and some dopamine neuron characteristics.
- This is an in vitro study using mouse cells, with no human clinical data involved.
- The research focuses on general neural differentiation mechanisms rather than NR4A2-specific pathology.
Nur77 induction and activation are necessary for interleukin-1 stimulation of proopiomelanocortin in AtT-20 corticotrophs.
Kovalovsky D, Paez Pereda M, Labeur M, Renner U, Holsboer F, Stalla GK, Arzt E
This study shows that the protein Nur77 is required for immune signals to stimulate hormone production in pituitary cells. It does not provide information relevant to NR4A2-related syndromes or dopaminergic neuron function.
- The research focuses on pituitary corticotroph cells, not brain dopamine neurons.
- It examines Nur77 (NR4A1), a different gene from the child's NR4A2 mutation.
- The findings relate to immune response and ACTH secretion in pituitary tissue.
- No clinical data or treatment implications for NR4A2 syndrome are presented.
[The research advance of nuclear receptor Nurr1].
Lai YL, Xie ZP
This article is a general review of the Nurr1 nuclear receptor's biological functions and its role in various physiological processes. It does not provide specific clinical data, treatment options, or genetic insights relevant to NR4A2-related syndromes.
- The paper reviews general biology of the Nurr1 receptor.
- It covers broad physiological roles without disease-specific focus.
- No human clinical data or patient outcomes are included.
- It lacks specific guidance for NR4A2-related conditions.
Induction of orphan nuclear receptor Nur77 gene expression and its role in cadmium-induced apoptosis in lung.
Shin HJ, Lee BH, Yeo MG, Oh SH, Park JD, Park KK, Chung JH, Moon CK, Lee MO
Cadmium exposure triggers the expression of Nur77 family genes in lung cells, leading to apoptosis and lung toxicity. This process involves specific signaling pathways and is linked to cell death in both human lung cells and rat lungs.
- Cadmium induces Nur77 genes in lung cells
- Nur77 activation causes cell death in the lungs
- Blocking Nur77 reduces cadmium-induced apoptosis
- This pathway may explain cadmium lung damage
- Signaling pathways control Nur77 expression
Modulation of nurr1 gene expression in mesencephalic dopaminergic neurones.
Volpicelli F, Perrone-Capano C, Da Pozzo P, Colucci-D'Amato L, di Porzio U
This study shows that Nurr1 expression in rat brain cells increases with electrical activity and that Sonic hedgehog signaling promotes the growth of dopaminergic neurons. These findings describe basic developmental mechanisms in animal tissue cultures without testing any treatments or involving human patients.
- Nurr1 levels peak during early development in rat midbrain tissue.
- Electrical stimulation increases Nurr1 mRNA and protein in cultured cells.
- Sonic hedgehog signaling expands dopaminergic neuron populations in vitro.
- The research uses only rat embryonic brain cultures, not human subjects.
Temporally induced Nurr1 can induce a non-neuronal dopaminergic cell type in embryonic stem cell differentiation.
Sonntag KC, Simantov R, Kim KS, Isacson O
Forcing Nurr1 expression in stem cell precursors creates non-neuronal cells that produce dopamine and express key dopaminergic markers. This process does not generate actual neurons but establishes a functional dopamine-producing cell type independent of neurogenesis.
- Nurr1 induction generates non-neuronal cells with dopamine transporters.
- These cells express midbrain dopaminergic markers like TH and AADC.
- Nurr1 maintains the phenotype by upregulating Ret and GDNF receptors.
- The induced cells function without becoming mature neurons.
Regulation of the osteopontin gene by the orphan nuclear receptor NURR1 in osteoblasts.
Lammi J, Huppunen J, Aarnisalo P
This study shows that Nurr1 regulates bone formation by directly activating the osteopontin gene in bone cells. It demonstrates that Nurr1 works with vitamin D to promote this process but is inhibited by estrogen-related receptors.
- Nurr1 increases osteopontin mRNA expression in osteoblastic cell lines.
- Nurr1 directly binds to and activates the mouse osteopontin promoter.
- Nurr1 and vitamin D synergistically activate bone gene expression.
- Estrogen-related receptors repress Nurr1-mediated activation of the osteopontin promoter.
Rotenone induces non-specific central nervous system and systemic toxicity.
Lapointe N, St-Hilaire M, Martinoli MG, Blanchet J, Gould P, Rouillard C, Cicchetti F
Rotenone causes widespread toxicity in animals, affecting both the brain and body, and does not reliably produce Parkinson's-like symptoms or brain changes seen in human Parkinson's disease. The observed movement problems are likely due to general illness rather than specific damage to dopamine neurons.
- Rotenone causes systemic illness, not just brain damage
- Movement issues are linked to overall health, not Parkinson's-like brain changes
- No consistent loss of dopamine neurons in the brain
- Brain changes seen are likely due to general toxicity, not specific Parkinson's pathology
- Subcutaneous rotenone is not a good model for Parkinson's disease
Differential role of ERK in cAMP-induced Nurr1 expression in N2A and C6 cells.
Lee MK, Nikodem VM
This study shows that the ERK signaling pathway regulates Nurr1 expression differently depending on the cell type, acting as a necessary component in some cells but inhibiting it in others. The findings rely entirely on standard cancer and glioma cell lines without any animal models or clinical data.
- ERK pathway effects on Nurr1 vary between neuroblastoma and glioma cell lines.
- PKA activation drives Nurr1 expression in both cell types studied.
- MEK inhibition blocks Nurr1 induction in N2A cells but increases it in C6 cells.
- No human subjects, animal models, or therapeutic interventions are included.
- Results describe basic molecular mechanisms with no direct clinical application.
Defining an N-terminal activation domain of the orphan nuclear receptor Nurr1.
Nordzell M, Aarnisalo P, Benoit G, Castro DS, Perlmann T
Researchers identified a specific core region in the Nurr1 protein that activates gene expression and found that cellular signaling pathways can enhance this activity through phosphorylation. This work maps the molecular mechanics of how Nurr1 functions but does not test any treatments or analyze patient data. It provides basic biological context rather than clinical guidance for managing NR4A2-related syndrome.
- The study defines a short core activation region near the start of the Nurr1 protein.
- Cellular signaling pathways boost Nurr1 activity via specific phosphorylation sites.
- This is basic molecular biology with no human patient data or treatment testing.
- Findings do not directly inform clinical management or therapeutic options for NR4A2 syndrome.
Dopaminergic differentiation of human embryonic stem cells.
Zeng X, Cai J, Chen J, Luo Y, You ZB, Fotter E, Wang Y, Harvey B, Miura T, Backman C, Chen GJ, Rao MS, Freed WJ
Human embryonic stem cells differentiate into functional dopaminergic neurons when cultured with PA6 support cells, expressing key markers like Nurr1 and releasing dopamine. These generated neurons integrate into the brains of Parkinson's disease model rats, although survival rates after transplantation are low.
- PA6 coculture efficiently generates human dopaminergic neurons from embryonic stem cells.
- Differentiated cells express Nurr1 and other specific dopaminergic markers.
- Neurons release dopamine but not noradrenaline upon stimulation.
- Transplanted cells survive in rat brains but in very small numbers.
Short interfering RNAs (siRNAs) for reducing dopaminergic phenotypic markers.
Bäckman C, Zhang Y, Hoffer BJ, Tomac AC
This study demonstrates that short interfering RNAs effectively suppress genes involved in the dopaminergic system, including NR4A2, in mammalian cells. The authors suggest this technique could serve as a tool for analyzing gene function or potentially inform future gene therapy strategies.
- siRNAs successfully knock down NR4A2 and other dopaminergic markers in cell cultures.
- The method uses a U6 promoter to drive siRNA expression alongside reporter genes.
- Results indicate potential for in vivo delivery of siRNAs to suppress dopamine-related genes.
- This is preclinical molecular biology with no human data or clinical application.
Nurr1-RXR heterodimers mediate RXR ligand-induced signaling in neuronal cells.
Wallen-Mackenzie A, Mata de Urquiza A, Petersson S, Rodriguez FJ, Friling S, Wagner J, Ordentlich P, Lengqvist J, Heyman RA, Arenas E, Perlmann T
RXR ligands activate Nurr1-RXR heterodimers to increase the survival of dopaminergic neurons in embryonic tissue. This mechanism identifies RXR-Nurr1 interactions as a potential therapeutic target for neurodegenerative diseases.
- Endogenous RXR ligands exist in the developing central nervous system.
- These ligands activate Nurr1-RXR heterodimers to promote neuronal survival.
- The study focuses on embryonic tissue, not adult or clinical settings.
- No human trials or NR4A2 variant data are included.
Immunohistochemical analysis of protein expression after middle cerebral artery occlusion in mice.
Erdö F, Trapp T, Mies G, Hossmann KA
This study maps changes in various proteins, including Nurr1, within mouse brains following a stroke-like injury. It identifies that Nurr1 moves from the nucleus to the cytoplasm after ischemic damage, highlighting regional protein regulation during brain injury.
- Researchers analyzed protein expression in mouse brains after inducing focal cerebral ischemia.
- Nurr1 translocates from the nucleus to the cytosol following ischemic injury in mice.
- The study highlights diverse up- and down-regulation patterns of various proteins post-injury.
- Findings emphasize the importance of regional analysis for interpreting proteomic data in brain injury.
The orphan nuclear receptors NURR1 and NGFIB regulate adrenal aldosterone production.
Bassett MH, Suzuki T, Sasano H, White PC, Rainey WE
NURR1 and another related protein, NGFIB, play a key role in controlling the production of aldosterone, a hormone critical for blood pressure regulation, by turning on the gene that makes aldosterone synthase. These proteins are activated by angiotensin II, the main signal that boosts aldosterone in the body, and they bind directly to the gene to increase its activity.
- NURR1 and NGFIB boost aldosterone production by activating the CYP11B2 gene
- Angiotensin II turns on NURR1 and NGFIB, linking them to hormone regulation
- NURR1 is mainly found in the adrenal zone that makes aldosterone
- Blocking a specific enzyme reduces NURR1 activity and aldosterone gene expression
- Three DNA sites, including one for NURR1, are needed for full gene activation
Organization and development of corticocortical associative neurons expressing the orphan nuclear receptor Nurr1.
Arimatsu Y, Ishida M, Kaneko T, Ichinose S, Omori A
This study identifies Nurr1 as a marker for specific excitatory neurons in the rat cerebral cortex that form long-range connections within the same brain hemisphere. It demonstrates that these neurons develop from embryonic day 18 and likely play a role in establishing normal cortical circuitry.
- Nurr1 marks excitatory glutamatergic neurons in specific layers of the rat neocortex.
- These Nurr1-positive neurons project to other areas within the same cerebral hemisphere.
- The study uses adult rats and does not involve human subjects or clinical data.
- Findings suggest a role for Nurr1 in cortical circuit formation, but this is preclinical.
Molecular mechanisms underlying midbrain dopamine neuron development and function.
Smidt MP, Smits SM, Burbach JP
This review outlines how transcription factors including Nurr1 (NR4A2) drive the development of dopamine neurons and explains how genetic disruptions in these pathways lead to functional deficits. It discusses the consequences of losing essential developmental genes and analyzes the system's potential to adapt to such dysfunction.
- Nurr1 is a key transcription factor for midbrain dopamine neuron development.
- Genetic ablation of Nurr1 disrupts the mesencephalic dopaminergic system.
- The paper reviews how dopamine homeostasis changes affect neuronal function.
- It analyzes the capacity of dopamine systems to adapt to gene dysfunction.
- This is a general review, not specific to NR4A2 syndrome variants.
PIASgamma represses the transcriptional activation induced by the nuclear receptor Nurr1.
Galleguillos D, Vecchiola A, Fuentealba JA, Ojeda V, Alvarez K, Gómez A, Andrés ME
This study identifies PIASgamma as a protein that suppresses the activity of Nurr1, the transcription factor affected in NR4A2-related syndromes. It demonstrates this interaction occurs in cell nuclei and involves specific molecular mechanisms within rodent brain tissue.
- PIASgamma binds to Nurr1 and represses its ability to activate target genes.
- The repression mechanism does not depend on known SUMOylation sites on Nurr1.
- Both proteins co-exist in the nuclei of rodent central nervous system cells.
Differential regulation of midbrain dopaminergic neuron development by Wnt-1, Wnt-3a, and Wnt-5a.
Castelo-Branco G, Wagner J, Rodriguez FJ, Kele J, Sousa K, Rawal N, Pasolli HA, Fuchs E, Kitajewski J, Arenas E
This study identifies specific Wnt proteins that control the growth and maturation of dopamine-producing neurons in developing brains. It demonstrates that different Wnt signals drive precursor cells to either multiply or transform into functional neurons through distinct molecular pathways.
- Wnt-3a increases the number of Nurr1-positive precursor cells without creating mature neurons.
- Wnt-1 promotes the proliferation of these precursors by regulating cell cycle proteins.
- Wnt-5a helps precursors mature into dopamine neurons by activating specific gene markers.
- Blocking Wnt signals stops both the growth and maturation of these brain cells.
The transcription factor Nurr1 in human NT2 cells and hNT neurons.
Misiuta IE, Anderson L, McGrogan MP, Sanberg PR, Willing AE, Zigova T
This study confirms that human NT2 cells and their derived hNT neurons naturally express the Nurr1 protein and mRNA. The findings show that Nurr1 is present alongside dopaminergic markers, suggesting it plays a role in the development of these specific neuron types.
- Human NT2 precursor cells express Nurr1 protein and mRNA.
- Differentiated hNT neurons also express Nurr1 independently of differentiation time.
- Nurr1 co-expresses with tyrosine hydroxylase in hNT neurons.
- The study uses human cell lines, not animal models or patients.
- Results describe basic biology without testing any treatments.
Vascular endothelial growth factor-regulated gene expression in endothelial cells: KDR-mediated induction of Egr3 and the related nuclear receptors Nur77, Nurr1, and Nor1.
Liu D, Jia H, Holmes DI, Stannard A, Zachary I
This study shows that vascular endothelial growth factor triggers the expression of NR4A2 (Nurr1) and related genes in blood vessel cells through specific signaling pathways. It identifies these receptors as early mediators of endothelial function but does not investigate their role in brain development or neurodegenerative disease.
- VEGF induces NR4A2, Nur77, and Nor1 expression in human endothelial cells.
- This induction occurs via KDR receptor signaling involving calcium and protein kinase C.
- The research focuses on blood vessel biology, not neurological function or disease.
- No clinical data or patient outcomes are presented.
Involvement of Nurr1 in specifying the neurotransmitter identity of ventral midbrain dopaminergic neurons.
Smits SM, Ponnio T, Conneely OM, Burbach JP, Smidt MP
This study confirms that the NR4A2 protein is required to turn on specific genes for dopamine transport and storage in developing brain cells, but it does not control the gene for the initial dopamine-making enzyme. The findings are based entirely on mouse models and do not provide direct evidence for human treatment strategies or clinical outcomes.
- NR4A2 is essential for activating dopamine transporter genes in developing midbrain neurons.
- The protein does not control the gene for the initial dopamine synthesis enzyme.
- Research relies on mouse models, limiting direct applicability to human patients.
- Findings describe basic molecular mechanisms rather than clinical interventions or therapies.
The orphan steroid receptor Nur77 family member Nor-1 is essential for early mouse embryogenesis.
DeYoung RA, Baker JC, Cado D, Winoto A
Nor-1 is essential for early mouse embryogenesis, as its absence causes embryonic lethality around day 8.5 due to failed gastrulation and mesoderm defects. This study highlights a critical developmental role for Nor-1 that is distinct from the dopaminergic functions associated with Nurr1.
- Nor-1 loss causes embryonic death in mice at day 8.5 of gestation.
- Mutant embryos fail to complete gastrulation and show mesoderm accumulation.
- This contrasts with Nur77 deficiency, which shows no gross phenotype in mice.
- The findings focus on early development rather than dopamine neuron function.
Rapid increase of Nurr1 expression in the substantia nigra after 6-hydroxydopamine lesion in the striatum of the rat.
Ojeda V, Fuentealba JA, Galleguillos D, Andrés ME
This rat study shows that damaging dopamine neurons triggers a rapid increase in Nurr1 protein and mRNA in the substantia nigra. The findings suggest Nurr1 helps compensate for dopamine loss, but the results come from an animal model of neurotoxicity rather than human genetics or clinical trials.
- Rats injected with a dopamine-toxin showed increased Nurr1 levels in key brain regions within 24 hours.
- Nurr1 appears to help compensate for dopamine depletion in adult rat brains.
- The study uses a toxic lesion model, not genetic NR4A2 variants or human patients.
- Results describe molecular responses in rats and do not translate directly to human therapy.
NR4A2 mutations are rare among European patients with familial Parkinson's disease.
Wellenbrock C, Hedrich K, Schäfer N, Kasten M, Jacobs H, Schwinger E, Hagenah J, Pramstaller PP, Vieregge P, Klein C
NR4A2 mutations are very uncommon in European families with Parkinson's disease, suggesting they are not a common cause of inherited Parkinson's in this population.
- NR4A2 mutations are rare in European familial Parkinson's cases
- Not a major genetic cause of inherited Parkinson's in this group
- Other genes likely play bigger roles in familial Parkinson's
- NR4A2 is not a primary target for genetic testing in this context
Genetic analysis of Nurr1 haplotypes in Parkinson's disease.
Tan EK, Chung H, Zhao Y, Shen H, Chandran VR, Tan C, Teoh ML, Yih Y, Pavanni R, Wong MC
This study found no strong link between variations in the Nurr1 gene and Parkinson's disease in the people studied, including a rare variant that appeared only in one patient. Nurr1 gene activity levels were similar in patients and healthy individuals, and common genetic patterns in the gene did not differ between groups.
- No major role for Nurr1 gene variants in most Parkinson's cases
- A rare variant found in only one patient was not linked to disease
- Nurr1 gene activity levels were unchanged in patients
- Common genetic patterns in Nurr1 did not differ between patients and controls
Nurr1 regulates dopamine synthesis and storage in MN9D dopamine cells.
Hermanson E, Joseph B, Castro D, Lindqvist E, Aarnisalo P, Wallén A, Benoit G, Hengerer B, Olson L, Perlmann T
The transcription factor Nurr1 directly controls the production and storage of dopamine in developing nerve cells. Without sufficient Nurr1, key enzymes and transporters required for dopamine function are deregulated.
- Nurr1 increases dopamine content in dopaminergic cells.
- Nurr1 upregulates AADC, an enzyme needed for dopamine synthesis.
- Nurr1 upregulates VMAT2, a transporter that stores dopamine.
- VMAT2 levels drop when Nurr1 expression is removed.
- Retinoids do not replicate these specific effects on dopamine machinery.
A linkage study of candidate loci in familial Parkinson's Disease.
Wirdefeldt K, Burgess CE, Westerberg L, Payami H, Schalling M
This study found no strong evidence linking known Parkinson's disease genes to 12 families with inherited Parkinson's, though some weak signals suggest possible genetic differences between families. The results do not point to any specific gene as responsible for these cases.
- No clear genetic link found to known Parkinson's genes
- Some weak signals suggest possible genetic differences between families
- Results do not rule out all genetic causes
- Study focused on familial Parkinson's, not NR4A2-related syndromes
Elevated locomotor activity without altered striatal dopamine contents in Nurr1 heterozygous mice after acute exposure to methamphetamine.
Bäckman C, You ZB, Perlmann T, Hoffer BJ
Mice with one copy of the Nurr1 gene show increased movement after methamphetamine exposure, even though their total brain dopamine levels remain normal. This suggests that having only one functional NR4A2 gene may affect how dopamine is released or cleared in the brain rather than reducing its overall amount.
- Mice with one Nurr1 copy move more after methamphetamine exposure.
- Total striatal dopamine levels stay normal in these mice.
- The mutation alters locomotor activity without changing dopamine content.
- Results hint at altered dopamine release or clearance dynamics.
Activation incarnate.
Privalsky ML
This paper reports that the Nurr1 protein can function without binding to a chemical ligand, revealing a new mechanism for how this transcription factor is regulated. It provides fundamental molecular insight into Nurr1 biology but does not involve human patients or direct therapeutic applications.
- Nurr1 assumes active shapes without needing a ligand agonist.
- The study clarifies how nuclear receptors regulate themselves.
- Three new publications demonstrate this ligand-independent activation.
- Findings focus on basic transcriptional regulation mechanisms.
NURR1 promoter polymorphisms: Parkinson's disease, schizophrenia, and personality traits.
Carmine A, Buervenich S, Galter D, Jönsson EG, Sedvall GC, Farde L, Gustavsson JP, Bergman H, Chowdari KV, Nimgaonkar VL, Anvret M, Sydow O, Olson L
This study found no strong link between specific changes in the NURR1 gene's promoter region and schizophrenia or Parkinson's disease in the groups studied. While some weak associations with personality traits or related features were seen, they did not hold up after accounting for multiple comparisons.
- No clear link found between NURR1 promoter variants and schizophrenia or Parkinson’s
- Previous NURR1 mutations were seen in psychiatric patients, but not in this study’s promoter analysis
- Some weak hints at personality links, but not statistically significant after correction
- No changes were found in exon 1 of NURR1 in Parkinson’s patients
- Findings suggest these promoter variants are unlikely to increase disease risk