Unrestricted somatic stem cells from human umbilical cord blood can be differentiated into neurons with a dopaminergic phenotype.
Greschat S, Schira J, Küry P, Rosenbaum C, de Souza Silva MA, Kögler G, Wernet P, Müller HW
Human stem cells from umbilical cord blood differentiate into dopamine-producing neurons when treated with specific growth factors. These cells express key dopaminergic markers, release dopamine, and show electrical activity characteristic of mature neurons.
- Umbilical cord blood stem cells become functional dopamine-producing neurons in lab dishes.
- Specific growth factors trigger the expression of Nurr1 and tyrosine hydroxylase.
- The derived cells synthesize and release dopamine neurotransmitter.
- Cells exhibit electrical properties typical of mature neurons.
Epigenetic targets for melatonin: induction of histone H3 hyperacetylation and gene expression in C17.2 neural stem cells.
Sharma R, Ottenhof T, Rzeczkowska PA, Niles LP
Melatonin promotes neuronal differentiation and increases histone H3 acetylation in neural stem cells. The treatment upregulates Nurr1 expression alongside other neuronal markers via the MT(1) receptor.
- Melatonin induces neurite-like extensions in C17.2 neural stem cells.
- Treatment increases mRNA expression of the neuronal marker beta-III-tubulin.
- Melatonin significantly upregulates Nurr1 gene expression in these cells.
- Histone H3 acetylation increases, suggesting epigenetic modulation of transcription.
- Effects appear mediated by the MT(1) melatonin receptor.
Melanocortin-1 receptor signaling markedly induces the expression of the NR4A nuclear receptor subgroup in melanocytic cells.
Smith AG, Luk N, Newton RA, Roberts DW, Sturm RA, Muscat GE
This study shows that skin cell signaling pathways activate NR4A genes to help repair DNA damage from UV light. It does not provide information about the neurological symptoms or treatment of NR4A2-related syndrome in children.
- MC1R signaling triggers NR4A gene expression in melanocytes.
- NR4A activation helps repair UV-induced DNA damage in skin cells.
- Specific MC1R variants impair this protective DNA repair mechanism.
- The research focuses on pigmentation and cancer risk, not neurology.
Transcriptional regulation of mesencephalic dopaminergic neurons: the full circle of life and death.
Alavian KN, Scholz C, Simon HH
This review explains how Nurr1 and other transcription factors guide the development, maintenance, and survival of dopamine-producing neurons in the brain. It highlights that these genes are critical for both forming these neurons during embryonic stages and keeping them healthy throughout life.
- Nurr1 helps establish dopamine neuron location and identity in the midbrain.
- These transcription factors ensure long-term survival of existing dopamine neurons.
- The paper reviews mechanisms relevant to Parkinson's disease pathology.
- It does not present new clinical data or treatment trials for NR4A2.
Corepressor interaction differentiates the permissive and non-permissive retinoid X receptor heterodimers.
Lammi J, Perlmann T, Aarnisalo P
This study explains the molecular mechanism by which Nurr1 activates gene transcription when paired with RXR, focusing on how ligand binding releases corepressor proteins. It identifies specific regions in the Nurr1 protein responsible for this interaction but does not test any treatments or analyze human patients.
- Nurr1 forms heterodimers with RXR to regulate gene transcription as a monomer or partner.
- RXR ligand binding releases corepressors SMRT and NcoR from RXR-Nurr1 complexes.
- The amino-terminal part of Nurr1's ligand binding domain drives this permissive interaction.
- RXR-RAR heterodimers remain bound to corepressors until RAR ligands bind.
- This is basic molecular biology with no direct clinical application or human data.
Gene Ontology-driven transcriptional analysis of CD34+ cell-initiated megakaryocytic cultures identifies new transcriptional regulators of megakaryopoiesis.
Fuhrken PG, Chen C, Apostolidis PA, Wang M, Miller WM, Papoutsakis ET
This study identifies NR4A2 as a transcription factor expressed in human megakaryocytes, expanding the known network of genes regulating blood cell development. It provides no information on neurological function, disease mechanisms, or potential treatments for NR4A2-related syndromes.
- NR4A2 is confirmed to be present in human megakaryocyte cells.
- The research focuses solely on blood cell differentiation pathways.
- No findings relate to the brain, dopamine, or neurodevelopment.
- The paper does not discuss clinical phenotypes or patient outcomes.
- Results are limited to molecular biology of hematopoietic stem cells.
Proneural bHLH neurogenin 2 differentially regulates Nurr1-induced dopamine neuron differentiation in rat and mouse neural precursor cells in vitro.
Park CH, Kang JS, Yoon EH, Shim JW, Suh-Kim H, Lee SH
This study shows that the interaction between Nurr1 and neurogenin 2 differs significantly between rat and mouse cells, complicating the translation of these findings to humans. The results highlight species-specific variations in dopamine neuron development that limit the direct applicability of this animal model data.
- Nurr1 efficiently generates dopamine neurons in rat neural precursor cells.
- Nurr1 produces low and variable dopamine neuron yields in mouse cells.
- Neurogenin 2 suppresses Nurr1-induced dopamine neuron generation in rats.
- Neurogenin 2 enhances Nurr1-induced dopamine neuron generation in mice.
- Findings suggest species-dependent differences in midbrain dopamine neuron development.
Orphan nuclear receptor NOR-1 enhances 3',5'-cyclic adenosine 5'-monophosphate-dependent uncoupling protein-1 gene transcription.
Kumar N, Liu D, Wang H, Robidoux J, Collins S
This study identifies a mechanism by which the NR4A2 family of proteins helps regulate brown fat metabolism in response to cold and stress signals. The findings describe how these receptors bind to DNA to increase the production of UCP1, a protein involved in heat generation. This work focuses on metabolic tissue regulation rather than neurological development or disease treatment.
- NR4A2 family proteins bind directly to the Ucp1 gene promoter to stimulate its transcription.
- Cold exposure and beta-agonists rapidly induce NR4A receptor expression in mouse and human adipocytes.
- Blocking NR4A activity prevents the stimulation of Ucp1 gene transcription by beta-adrenergic signals.
- The study defines a specific DNA sequence motif required for this metabolic regulation.
Differential expression and dynamic changes of murine NEDD9 in progenitor cells of diverse tissues.
Aquino JB, Marmigère F, Lallemend F, Lundgren TK, Villar MJ, Wegner M, Ernfors P
This study maps where the protein NEDD9 appears in developing mouse tissues, finding it overlaps with NR4A2 (Nurr1) in early neural progenitor cells before disappearing as those cells mature. The research provides no information on human health, treatment options, or the specific effects of NR4A2 mutations.
- The study uses mouse embryos, not human patients or clinical data.
- It focuses on NEDD9, a scaffolding protein, rather than NR4A2 function.
- NEDD9 overlaps with Nurr1 in early neural progenitors but drops off upon maturation.
- No therapeutic insights or genotype-phenotype correlations for NR4A2 syndromes are presented.
Genotype patterns that contribute to increased risk for or protection from developing heroin addiction.
Nielsen DA, Ji F, Yuferov V, Ho A, Chen A, Levran O, Ott J, Kreek MJ
This study identifies NR4A2 as one of five genes potentially associated with heroin addiction risk in a specific human cohort. It does not provide information on the neurodevelopmental, motor, or language phenotypes relevant to children with NR4A2 syndrome.
- NR4A2 appears in a list of genes linked to heroin addiction vulnerability.
- The study uses a small cohort of Caucasian adults with severe addiction history.
- No data on developmental outcomes, epilepsy, or motor symptoms is presented.
- Findings relate to substance use disorder, not the child's syndrome.
Gene expression profile of neuronal progenitor cells derived from hESCs: activation of chromosome 11p15.5 and comparison to human dopaminergic neurons.
Freed WJ, Chen J, Bäckman CM, Schwartz CM, Vazin T, Cai J, Spivak CE, Lupica CR, Rao MS, Zeng X
This study maps gene activity in human stem cells as they develop into dopamine neurons, identifying a specific chromosome region that activates during this process. It confirms that genes involved in dopamine neuron development are expressed in these lab-grown cells and in mature human brain tissue.
- Researchers tracked gene expression in human stem cells differentiating into dopamine neurons.
- A chromosome region on 11p15.5 activates during the formation of neuronal precursors.
- Key dopamine-related genes like TH, IGF2, and CDKN1C show high activity.
- Findings in lab-grown cells match gene patterns in mature human brain samples.
A novel adipokine CTRP1 stimulates aldosterone production.
Jeon JH, Kim KY, Kim JH, Baek A, Cho H, Lee YH, Kim JW, Kim D, Han SH, Lim JS, Kim KI, Yoon DY, Kim SH, Oh GT, Kim E, Yang Y
CTRP1, a fat-derived protein, increases aldosterone production in human adrenal cells by boosting the activity of genes and proteins involved in hormone synthesis, including NURR1, and may link obesity and high blood pressure in humans.
- CTRP1 boosts aldosterone production in human adrenal cells
- CTRP1 increases NURR1 and aldosterone-making genes
- CTRP1 levels are high in obese and hypertensive people
- CTRP1 may connect obesity to high blood pressure
- CTRP1 is released in response to angiotensin II
Social isolation rearing-induced impairment of the hippocampal neurogenesis is associated with deficits in spatial memory and emotion-related behaviors in juvenile mice.
Ibi D, Takuma K, Koike H, Mizoguchi H, Tsuritani K, Kuwahara Y, Kamei H, Nagai T, Yoneda Y, Nabeshima T, Yamada K
Social isolation in juvenile mice reduces hippocampal neurogenesis and impairs memory and behavior, an effect linked to decreased expression of the gene Nurr1 (NR4A2). Fluoxetine treatment prevents these cellular deficits and improves behavioral outcomes in this model. This study suggests that environmental factors during development may influence NR4A2-related pathways.
- Social isolation reduces new neuron survival and differentiation in juvenile mouse hippocampus.
- Isolated mice show impaired spatial memory and increased aggression.
- Fluoxetine prevents neurogenesis deficits and ameliorates behavioral impairments.
- Social isolation lowers expression of Nurr1 (NR4A2) and Npas4 genes.
- Findings link environmental stress to NR4A2-mediated developmental changes.
The NR4A family of orphan nuclear receptors are not required for adipogenesis.
Au WS, Payne VA, O'Rahilly S, Rochford JJ
NR4A2-related syndrome is not linked to fat cell development, as the NR4A family of genes—including NR4A2—plays no essential role in forming fat cells, according to studies in mouse cells.
- NR4A genes are not needed for fat cell formation
- Blocking NR4A activity does not stop fat cell development
- NR4A2 function in fat cells is likely minimal
- These genes are more important in liver and muscle metabolism
Expression and function of nr4a2, lmx1b, and pitx3 in zebrafish dopaminergic and noradrenergic neuronal development.
Filippi A, Dürr K, Ryu S, Willaredt M, Holzschuh J, Driever W
This study uses zebrafish to show that the NR4A2 protein is required for developing neurons to produce dopamine, confirming its role in neurotransmitter specification. It also identifies a related gene, Lmx1b, as important for generating precursor cells that eventually become dopaminergic neurons.
- NR4A2 activity is necessary for zebrafish neurons to express dopamine-related proteins.
- The study confirms NR4A2 helps specify the neurotransmitter phenotype in developing brains.
- Lmx1b genes support the creation of precursor cells for ascending dopaminergic systems.
- Pitx3 knockdown did not specifically affect diencephalic dopamine clusters in this model.
Angiotensin-II acute regulation of rapid response genes in human, bovine, and rat adrenocortical cells.
Nogueira EF, Vargas CA, Otis M, Gallo-Payet N, Bollag WB, Rainey WE
This study identifies NR4A2 as a gene rapidly activated by Angiotensin-II in adrenal cells across human, bovine, and rat models. The findings confirm that NR4A2 is a direct target of this signaling pathway in the adrenal cortex.
- NR4A2 activates quickly in response to Angiotensin-II stimulation.
- This regulation occurs directly without requiring new protein synthesis.
- The effect is consistent across human, bovine, and rat adrenal cells.
- NR4A2 joins other immediate-early genes in regulating aldosterone production.
Beneficial effects of dietary omega-3 polyunsaturated fatty acid on toxin-induced neuronal degeneration in an animal model of Parkinson's disease.
Bousquet M, Saint-Pierre M, Julien C, Salem N, Cicchetti F, Calon F
A high omega-3 diet protects dopaminergic neurons and preserves dopamine levels in mice exposed to a Parkinson's-inducing toxin. This neuroprotection occurs at the cellular level but does not prevent damage to nerve terminals in the striatum.
- High omega-3 intake prevents loss of nigral neurons in toxin-exposed mice.
- The diet preserves Nurr1 mRNA and dopamine transporter levels in the substantia nigra.
- Striatal dopamine and metabolite levels remain higher in omega-3 treated mice.
- Nerve terminals in the striatum show no protection from the diet.
mRNA expression of activity-regulated cytoskeleton-associated protein (arc) in the amygdala-kindled rats.
Akiyama K, Ishikawa M, Saito A
This study measures brain gene activity in rats with seizures and finds no direct evidence regarding NR4A2-related syndromes or human treatments. The research focuses on general seizure mechanisms rather than the specific genetic condition affecting your child.
- The study uses rat models of amygdala-kindling to observe brain changes during seizures.
- It tracks mRNA levels of arc, NGFI-B, and Nurr1 in specific brain regions after stimulation.
- Nurr1 expression increases temporarily in the piriform cortex and amygdaloid nucleus after seizures.
- The findings describe synaptic reorganization markers but do not address NR4A2 haploinsufficiency.
- No human data, clinical outcomes, or therapeutic implications for NR4A2 disorders are presented.
Delta-like 1 participates in the specification of ventral midbrain progenitor derived dopaminergic neurons.
Bauer M, Szulc J, Meyer M, Jensen CH, Terki TA, Meixner A, Kinkl N, Gasser T, Aebischer P, Ueffing M
This study identifies Delta-like 1 (Dlk1) as a protein that supports the development of dopamine-producing neurons in the midbrain. Removing Dlk1 reduces the number of these neurons, while adding it increases their production during early growth stages.
- Dlk1 is expressed in mouse ventral midbrain progenitors and mature dopamine neurons.
- Adding soluble Dlk1 boosts the proliferation of dopamine progenitor cells.
- Silencing Dlk1 prevents the expression of key dopamine neuron markers.
- Dlk1 appears to have a permissive role in dopamine neuron differentiation.
The glucocorticoid receptor is a co-regulator of the orphan nuclear receptor Nurr1.
Carpentier R, Sacchetti P, Ségard P, Staels B, Lefebvre P
The glucocorticoid receptor physically interacts with Nurr1 to regulate its transcriptional activity, suggesting that stress hormones can indirectly control this protein. This interaction provides a potential mechanism for pharmacologically modulating Nurr1 levels using existing glucocorticoid drugs. However, the study relies on molecular biology techniques and does not involve human patients or animal models of NR4A2 syndrome.
- Glucocorticoid receptor binds directly to Nurr1 in brain regions like the substantia nigra.
- This interaction allows glucocorticoids to regulate Nurr1's transcriptional activity.
- Co-regulators SMRT and SRC2 modulate the combined effect of these two receptors.
- The study identifies a molecular pathway but lacks clinical or animal model data.
- No evidence is provided regarding human NR4A2 variants or patient outcomes.
Neural precursors derived from human embryonic stem cells maintain long-term proliferation without losing the potential to differentiate into all three neural lineages, including dopaminergic neurons.
Hong S, Kang UJ, Isacson O, Kim KS
Human embryonic stem cells expand significantly in the lab while retaining the ability to become dopaminergic neurons and other neural types. These expanded precursors maintain their potential for over two years when frozen, providing a scalable source of human neural cells.
- Human neural precursors expand 380,000-fold in culture without losing differentiation potential.
- Cells generate neurons, astrocytes, and oligodendrocytes, including dopamine-producing neurons.
- Dopaminergic neurons express key markers like Nurr1 and release dopamine.
- Precursors remain viable after long-term storage and multiple freeze-thaw cycles.
NR4A nuclear orphan receptors: protective in vascular disease?
Pols TW, Bonta PI, de Vries CJ
This review discusses how NR4A nuclear receptors influence metabolism and vascular health in the context of cardiovascular disease. It does not provide information relevant to NR4A2-related neurological syndromes or potential treatments for children.
- The paper focuses on vascular disease, not neurological development or movement disorders.
- It reviews NR4A1, NR4A2, and NR4A3 roles in metabolism and blood vessel health.
- No clinical data, patient phenotypes, or therapeutic strategies for NR4A2 syndrome are presented.
- The content is unrelated to dopaminergic neuron function or Parkinson's disease mechanisms.
Comparison between intraperitoneal and subcutaneous phencyclidine administration in Sprague-Dawley rats: a locomotor activity and gene induction study.
Kalinichev M, Robbins MJ, Hartfield EM, Maycox PR, Moore SH, Savage KM, Austin NE, Jones DN
This study compares two ways of giving PCP to rats and finds that the subcutaneous route causes stronger and longer-lasting behavioral changes and greater brain gene activity than the intraperitoneal route, due to higher drug levels in the blood and brain. The results help define a more reliable animal model for studying acute psychosis.
- Subcutaneous PCP causes stronger hyperactivity than intraperitoneal
- Subcutaneous route leads to higher brain and blood PCP levels
- More genes related to brain activity are turned on with subcutaneous dosing
- This method creates a more consistent model of acute psychosis
- Findings help improve animal models for studying psychosis
A regulatory circuit mediating convergence between Nurr1 transcriptional regulation and Wnt signaling.
Kitagawa H, Ray WJ, Glantschnig H, Nantermet PV, Yu Y, Leu CT, Harada S, Kato S, Freedman LP
This study maps how Wnt signaling proteins physically interact with Nurr1 to switch it from a repressor to an activator of gene expression. It identifies a specific feedback loop where the resulting genes help regulate the Wnt signal itself, providing a detailed molecular mechanism for Nurr1 regulation.
- Beta-catenin binds Nurr1 and removes corepressors to activate target genes.
- The study identifies KCNIP4 as a gene responsive to both Nurr1 and Wnt signaling.
- KCNIP4 creates a negative feedback loop that limits beta-catenin activity.
- This mechanism explains how Wnt signals regulate Nurr1 function in dopaminergic neurons.
Nurr1 is phosphorylated by ERK2 in vitro and its phosphorylation upregulates tyrosine hydroxylase expression in SH-SY5Y cells.
Zhang T, Jia N, Fei E, Wang P, Liao Z, Ding L, Yan M, Nukina N, Zhou J, Wang G
This study shows that a specific cellular signaling pathway (ERK2) modifies the Nurr1 protein, which in turn increases the production of tyrosine hydroxylase, a key enzyme for dopamine synthesis. The findings are based entirely on cell culture experiments and do not involve human patients or animal models.
- ERK2 phosphorylates Nurr1 at specific sites near its activation domain.
- This modification enhances Nurr1's ability to drive tyrosine hydroxylase expression.
- The research uses only SH-SY5Y human neuroblastoma cell lines.
- No clinical data or patient outcomes are reported in this study.
Increased expression of the orphan nuclear receptor NURR1 in psoriasis and modulation following TNF-alpha inhibition.
O'Kane M, Markham T, McEvoy AN, Fearon U, Veale DJ, FitzGerald O, Kirby B, Murphy EP
NURR1, a gene linked to neurological development and function, is abnormally increased in psoriasis skin and linked to disease severity. TNF-alpha blockers reduce NURR1 levels and restore its normal location in cells, suggesting a possible mechanism for how these drugs work.
- NURR1 is overexpressed in psoriasis skin
- Higher NURR1 levels match worse symptoms
- TNF-alpha inhibitors lower NURR1 levels
- NURR1 moves from nucleus to cytoplasm after treatment
- NURR1 may be a key player in inflammation
Specification of a dopaminergic phenotype from adult human mesenchymal stem cells.
Trzaska KA, Kuzhikandathil EV, Rameshwar P
Adult human bone marrow stem cells convert into dopamine-producing neurons in a laboratory dish within 12 days. These induced cells express key dopamine markers and release dopamine, though they remain at an immature progenitor stage.
- Adult human bone marrow stem cells become dopamine neurons in 12 days.
- Induction uses sonic hedgehog and fibroblast growth factors.
- Approximately 67% of cells express tyrosine hydroxylase.
- Cells secrete dopamine but lack mature voltage-gated channels.
- Results demonstrate in vitro generation of dopaminergic progenitors.
Trophism of neural progenitor cells to embryonic stem cells: neural induction and transplantation in a mouse ischemic stroke model.
Fong SP, Tsang KS, Chan AB, Lu G, Poon WS, Li K, Baum LW, Ng HK
This study shows that neural progenitor cells can guide embryonic stem cells to become neural cells, improving brain function in mice with stroke. The process works without direct contact, relying on chemical signals, and produces cells that resemble neurons, astrocytes, and oligodendrocytes.
- Neural progenitor cells help stem cells become brain cells
- No unwanted cell types like muscle or gut cells formed
- Treated mice showed better brain function after stroke
- Most transplanted cells stayed near the injection site
- One tumor formed, but most cells were safe and functional
Nuclear receptor NR4A2 IVS6 +18insG and brain derived neurotrophic factor (BDNF) V66M polymorphisms and risk of Taiwanese Parkinson's disease.
Chen CM, Chen IC, Chang KH, Chen YC, Lyu RK, Liu YT, Hu FJ, Chao CY, Lee-Chen GJ, Wu YR
The NR4A2 IVS6 +18insG genetic variation may slightly lower the risk of Parkinson's disease in Taiwanese women, but not in men or overall. No clear link was found between this or the BDNF V66M variant and Parkinson's disease risk or age of onset in this study.
- NR4A2 IVS6 +18insG may reduce Parkinson’s risk in Taiwanese women
- No overall link between NR4A2 or BDNF variants and Parkinson’s in the group
- BDNF V66M did not affect disease onset age
- Findings were only significant in women after subgroup analysis
- No strong evidence for these variants influencing Parkinson’s in men
cDNA microarray analysis of cyclosporin A (CsA)-treated human peripheral blood mononuclear cells reveal modulation of genes associated with apoptosis, cell-cycle regulation and DNA repair.
Baião AM, Wowk PF, Sandrin-Garcia P, Junta CM, Fachin AL, Mello SS, Sakamoto-Hojo ET, Donadi EA, Passos GA
This study identifies NR4A2 as one of several genes whose expression changes in immune cells treated with the immunosuppressant cyclosporin A. The findings describe a molecular interaction between an unrelated drug and NR4A2 but do not provide information on the gene's natural function, disease mechanisms, or potential treatments for NR4A2-related syndromes.
- NR4A2 expression changes in immune cells treated with cyclosporin A.
- The study focuses on drug-induced gene modulation, not NR4A2 biology.
- No clinical data or treatment implications for NR4A2 syndromes are presented.
- Findings are limited to peripheral blood mononuclear cell experiments.
Cross-talk between the NR3B and NR4A families of orphan nuclear receptors.
Lammi J, Rajalin AM, Huppunen J, Aarnisalo P
This study demonstrates that NR4A2 (Nurr1) and related receptors mutually repress each other's activity through direct protein interactions. This mechanism modulates the transcriptional output of these nuclear receptors in specific cell types like osteoblasts.
- NR3B and NR4A receptor families mutually repress each other's transcriptional activity.
- Repression requires intact DNA-binding domains and dimerization interfaces.
- The mechanism does not involve competition for DNA binding sites.
- Activation functions of the receptors are not required for this cross-talk.
- This interaction modulates nuclear receptor activity in co-expressed cell types.
Merging mouse transcriptome analyses with Parkinson's disease linkage studies.
Gherbassi D, Bhatt L, Thuret S, Simon HH
This study uses mouse brain data to identify candidate genes for Parkinson's disease, including NR4A2. It does not provide new clinical information or treatment insights for children with NR4A2-related syndromes.
- The paper focuses on identifying genetic causes of adult-onset Parkinson's disease.
- It confirms NR4A2 is expressed in dopamine neurons relevant to Parkinson's pathology.
- No human clinical data, phenotypes, or treatment outcomes for NR4A2 variants are reported.
- The findings do not address the neurodevelopmental aspects of NR4A2 syndrome.
Atherogenic phospholipids attenuate osteogenic signaling by BMP-2 and parathyroid hormone in osteoblasts.
Huang MS, Morony S, Lu J, Zhang Z, Bezouglaia O, Tseng W, Tetradis S, Demer LL, Tintut Y
Atherogenic phospholipids block bone-building signals from BMP-2 and parathyroid hormone in bone cells, which may reduce the effectiveness of bone-building treatments in people with high cholesterol or atherosclerosis.
- Atherogenic lipids inhibit bone formation signals
- They reduce response to BMP-2 and PTH treatments
- This may weaken bone-building therapies in high-risk patients
- The effect is linked to ERK pathway activation
- Suggests heart disease risk may impact bone treatment success
Mono-(2-ethylhexyl) phthalate (MEHP) induces nuclear receptor 4A subfamily in NCI-H295R cells: a possible mechanism of aromatase suppression by MEHP.
Noda M, Ohno S, Nakajin S
MEHP, a breakdown product of a common plasticizer, suppresses aromatase activity in human adrenal cells by rapidly increasing levels of the Nur77 protein, which in turn blocks the gene responsible for making aromatase. This effect is linked to activation of specific cellular signaling pathways.
- MEHP reduces aromatase, a key hormone-making enzyme
- MEHP boosts Nur77 protein levels quickly in human cells
- Nur77 directly suppresses aromatase gene activity
- This effect involves known cellular signaling pathways
- Findings suggest environmental chemicals may disrupt hormone balance
Bdnf gene is a downstream target of Nurr1 transcription factor in rat midbrain neurons in vitro.
Volpicelli F, Caiazzo M, Greco D, Consales C, Leone L, Perrone-Capano C, Colucci D'Amato L, di Porzio U
This study identifies Bdnf as a direct target gene of the Nurr1 transcription factor in rat neurons, showing that Nurr1 regulates Bdnf expression to support dopaminergic neuron development. The findings confirm a molecular mechanism where Nurr1 directly controls Bdnf levels through specific signaling pathways.
- Nurr1 directly regulates Bdnf gene expression in rat midbrain neurons.
- Decreased Nurr1 leads to reduced BDNF protein and mRNA levels.
- BDNF is essential for the maturation of dopaminergic neurons.
- The study uses rat cell cultures, not human patients or clinical data.
Adult mice with reduced Nurr1 expression: an animal model for schizophrenia.
Rojas P, Joodmardi E, Hong Y, Perlmann T, Ogren SO
This study uses mice with reduced Nurr1 levels to model schizophrenia, finding behavioral changes and altered dopamine activity that do not directly address the movement disorders associated with NR4A2 syndrome in children. The findings focus on psychiatric symptoms and general dopaminergic mechanisms rather than the specific clinical phenotype or treatment options for NR4A2-related conditions.
- Mice with reduced Nurr1 show hyperactivity and memory deficits resembling schizophrenia.
- The study models psychiatric symptoms, not the motor issues seen in NR4A2 syndrome.
- Dopamine turnover changes differ between male and female mice brain regions.
- No human data or direct treatment implications for NR4A2 patients are provided.
Discovery of ligands for Nurr1 by combined use of NMR screening with different isotopic and spin-labeling strategies.
Poppe L, Harvey TS, Mohr C, Zondlo J, Tegley CM, Nuanmanee O, Cheetham J
Researchers use nuclear magnetic resonance techniques to identify and optimize small molecules that bind to the Nurr1 protein. This work establishes a method for finding chemical compounds that interact with Nurr1, but it does not test these compounds in living organisms or humans.
- The study identifies weak-binding ligands for the Nurr1 protein using advanced NMR screening methods.
- It maps the specific binding site on the Nurr1 protein through residue-specific labeling.
- No animal models, human trials, or therapeutic efficacy data are included in this report.
NR4A nuclear receptors in atherosclerosis and vein-graft disease.
Bonta PI, Pols TW, de Vries CJ
NR4A nuclear receptors, including Nurr1, play roles in vascular diseases like atherosclerosis and vein graft failure by regulating cell behavior in blood vessels. These receptors influence inflammation, cell survival, and tissue repair in the context of vascular injury.
- NR4A receptors regulate blood vessel health and disease
- Nurr1 affects inflammation and cell survival in vessels
- These receptors are involved in vein graft failure and atherosclerosis
- Potential target for treating vascular damage
A role for type 1alpha corticotropin-releasing hormone receptors in mediating local changes in chronically inflamed tissue.
Ralph JA, Zocco D, Bresnihan B, Fitzgerald O, McEvoy AN, Murphy EP
This study finds that a specific receptor for stress-related hormones (CRH-R1alpha) is produced by blood vessel cells in inflamed joints and drives inflammation, partly by activating a gene called NR4A2. The hormone histamine boosts this receptor, and the pathway involves key signaling molecules linked to immune responses and tissue damage.
- CRH-R1alpha is made in joint blood vessels during chronic inflammation
- Histamine increases CRH-R1alpha via its own receptor
- CRH-R1alpha activates NR4A2 and inflammation-related genes
- This pathway promotes nitric oxide production and tissue damage
- Targeting this pathway may reduce joint inflammation
[Human bone marrow mesenchymal stem cells differentiated into dopaminergenic neurons in vitro].
Chai LH, Wu SX, Yan WH, Ma YF
This study demonstrates that human bone marrow stem cells can be converted into dopamine-producing neurons in a laboratory dish using specific chemical signals. The resulting cells express key genetic markers and release dopamine, suggesting they could potentially serve as a source for cell replacement therapies in conditions like Parkinson's disease.
- Human bone marrow stem cells differentiate into dopamine neurons in vitro.
- Cells express Nurr1, TH, and other dopaminergic neuron markers.
- Differentiated cells release measurable amounts of dopamine.
- This is preclinical research using cell cultures, not human trials.
- No connection to NR4A2 syndrome or genetic treatment strategies.