Epigenetic cues in midbrain dopaminergic neuron development.
Perrone-Capano C, Da Pozzo P, di Porzio U
NR4A2 (Nurr1) is a critical transcription factor that drives the development of midbrain dopamine neurons, which are essential for movement, reward, and cognition. These neurons mature in stages: dopamine production begins after Nurr1 activation, and full function depends on connections with target brain regions.
- NR4A2/Nurr1 is essential for dopamine neuron development
- Dopamine production starts after Nurr1 expression
- Neuron function matures through connections with target brain areas
- Timing of gene expression shapes dopamine neuron function
- Target brain connections fine-tune dopamine signaling
Genetic and epigenetic control of midbrain dopaminergic neuron development.
Perrone-Capano C, Di Porzio U
NR4A2 (Nurr1) is a critical transcription factor that drives the development and function of midbrain dopamine neurons, which are essential for movement, mood, and reward. Proper dopamine neuron maturation requires Nurr1 activation, interactions with target brain regions, and precise timing of gene expression for dopamine production and signaling.
- NR4A2/Nurr1 is essential for dopamine neuron development
- Nurr1 activates genes for dopamine production and function
- Dopamine neuron maturation depends on brain region connections
- Timing of gene expression affects dopamine signaling
- Grafted dopamine neurons need correct brain partner matching
Activity of the Nurr1 carboxyl-terminal domain depends on cell type and integrity of the activation function 2.
Castro DS, Arvidsson M, Bondesson Bolin M, Perlmann T
The Nurr1 protein, critical for brain development and dopamine cell formation, can activate genes without needing a known ligand, but this activity depends on the cell type and the integrity of a specific region in its structure. This suggests that natural or unknown molecules might regulate Nurr1 in the brain, potentially offering new treatment paths for NR4A2-related disorders.
- Nurr1 activates genes without needing a known ligand
- Its activity depends on the cell type and its structural region
- Unknown molecules may regulate Nurr1 in the brain
- This could lead to new treatments for NR4A2-related conditions
A selective group of dopaminergic neurons express Nurr1 in the adult mouse brain.
Bäckman C, Perlmann T, Wallén A, Hoffer BJ, Morales M
In adult mice, Nurr1 is mainly found in midbrain and olfactory bulb dopamine neurons, but not in other dopamine or adrenaline neurons. This shows Nurr1 is specifically linked to certain dopamine pathways, especially those involved in movement and smell.
- Nurr1 is present in most midbrain dopamine neurons
- Nurr1 is also in olfactory bulb dopamine neurons
- Nurr1 is absent in many other dopamine and adrenaline neurons
- Nurr1 is not needed for all dopamine cells to survive
- This suggests Nurr1 supports specific brain dopamine functions
Fate of mesencephalic AHD2-expressing dopamine progenitor cells in NURR1 mutant mice.
Wallén A, Zetterström RH, Solomin L, Arvidsson M, Olson L, Perlmann T
In mice without the NURR1 gene, dopamine-producing brain cells start forming normally but fail to mature, migrate properly, connect to their target areas, or survive. This shows NURR1 is essential for the final development of these critical brain cells.
- NURR1 is needed for dopamine cells to mature and survive
- Progenitor cells form but don’t migrate or connect correctly
- Early dopamine markers appear even without NURR1
- NURR1 loss disrupts brain circuit formation
- Findings highlight NURR1’s role in later stages of development
4.5 kb of the rat tyrosine hydroxylase 5' flanking sequence directs tissue specific expression during development and contains consensus sites for multiple transcription factors.
Schimmel JJ, Crews L, Roffler-Tarlov S, Chikaraishi DM
The 4.5 kb region upstream of the rat tyrosine hydroxylase gene contains all the necessary instructions for correct brain and nervous system expression during development, including control elements that match known regulators of dopamine neuron formation.
- This DNA region directs accurate brain and nerve cell expression of a gene critical for dopamine production.
- It includes binding sites for Nurr1, a key protein linked to NR4A2-related disorders.
- The findings help explain how dopamine neurons develop and may inform future therapies.
- The region's function is similar to longer promoter sequences, making it a strong candidate for gene therapy targeting.
- Nurr1 and other transcription factors in this region are directly relevant to NR4A2 biology.
Characterization of the 5'-flanking region of the human dopamine transporter gene.
Sacchetti P, Brownschidle LA, Granneman JG, Bannon MJ
The study identifies regulatory elements in the human dopamine transporter (DAT) gene that control its activity, showing that the transcription factor NURR1 boosts DAT gene expression, which is relevant to dopamine signaling in the brain.
- NURR1 increases activity of the dopamine transporter gene
- Regulatory regions control when and how much DAT is made
- The gene's activity is influenced by specific DNA sequences near the start
- Cyclic AMP does not affect DAT gene expression in this study
Heterodimerization between members of the Nur subfamily of orphan nuclear receptors as a novel mechanism for gene activation.
Maira M, Martens C, Philips A, Drouin J
Nur77 and Nurr1, two related proteins involved in brain development and function, work together as a team to turn on specific genes more effectively than when they act alone. This teamwork depends on the DNA sequence of the gene, meaning different gene targets are activated based on which pair forms. This discovery suggests that boosting or guiding these protein pairs could help treat disorders linked to Nurr1, like NR4A2-related syndrome.
- Nur77 and Nurr1 form powerful teams that boost gene activation
- These teams work better than either protein alone
- The DNA sequence determines which genes get turned on
- This teamwork may explain how Nurr1 controls brain development
- Targeting these pairs could lead to new treatments
Reduced Nurr1 expression increases the vulnerability of mesencephalic dopamine neurons to MPTP-induced injury.
Le W, Conneely OM, He Y, Jankovic J, Appel SH
Reduced Nurr1 levels make dopamine-producing brain cells more sensitive to damage from toxins, even if the cells appear normal at first. This suggests that people with NR4A2 gene changes may have hidden weaknesses in their brain cells that could lead to problems later.
- Lower Nurr1 levels increase brain cell vulnerability
- Cells look normal but are more easily damaged
- This may explain why NR4A2 mutations cause issues over time
- Nurr1 helps protect mature dopamine neurons
- Toxin exposure could worsen symptoms in affected individuals
Identification of nuclear orphan receptors as regulators of expression of a neurotransmitter receptor gene.
Chew LJ, Huang F, Boutin JM, Gallo V
NR4A2 (NURR1) is one of several nuclear receptors that bind to a specific DNA region in the GRIK5 gene, reducing its activity. This suggests NR4A2 may regulate glutamate receptor levels in the brain, potentially affecting nerve signaling in conditions like NR4A2-related syndrome.
- NR4A2 binds to the GRIK5 gene's intron
- This binding reduces GRIK5 gene activity
- NR4A2 acts as a transcriptional repressor
- The effect is seen in developing brain tissue
- May influence glutamate signaling in neurons
Selective agenesis of mesencephalic dopaminergic neurons in Nurr1-deficient mice.
Le W, Conneely OM, Zou L, He Y, Saucedo-Cardenas O, Jankovic J, Mosier DR, Appel SH
In mice without the Nurr1 gene, dopamine-producing neurons in the midbrain are completely missing, leading to severe dopamine loss in brain areas linked to movement and reward—similar to what happens in Parkinson's disease. Other neuron types, including those using serotonin, norepinephrine, and acetylcholine, remain intact.
- Nurr1 is essential for midbrain dopamine neuron development
- Dopamine neurons vanish in key motor control areas
- Dopamine levels drop by 98% in the striatum
- Other neurotransmitter systems are unaffected
- This model mimics Parkinson’s disease patterns
Nurr1, an orphan nuclear receptor, is a transcriptional activator of endogenous tyrosine hydroxylase in neural progenitor cells derived from the adult brain.
Sakurada K, Ohshima-Sakurada M, Palmer TD, Gage FH
Nurr1 directly turns on the tyrosine hydroxylase gene in neural stem cells, even without triggering full dopamine neuron development. This shows Nurr1 acts independently of other signals that shape dopamine cells, suggesting it plays a key role in defining dopamine neuron identity.
- Nurr1 activates tyrosine hydroxylase, a key dopamine enzyme
- This happens without affecting cell division or general neuron formation
- Nurr1 works alone, separate from other dopamine development signals
- The effect is specific to dopamine-related gene expression
- Suggests Nurr1 is a master switch for dopamine neuron identity
Induction of a midbrain dopaminergic phenotype in Nurr1-overexpressing neural stem cells by type 1 astrocytes.
Wagner J, Akerud P, Castro DS, Holm PC, Canals JM, Snyder EY, Perlmann T, Arenas E
Overexpressing the Nurr1 gene in neural stem cells, combined with signals from type 1 astrocytes, turns these cells into midbrain dopaminergic neurons—similar to those lost in Parkinson’s disease. This method produces large numbers of cells that survive and integrate when transplanted, offering a potential therapy for brain disorders involving dopamine loss.
- Nurr1 overexpression drives stem cells to become dopamine neurons
- Type 1 astrocytes provide essential signals for this transformation
- Over 80% of cells match natural dopamine neurons
- Cells survive and integrate after transplantation
- Potential for treating Parkinson’s and related conditions
Organization of the human orphan nuclear receptor Nurr1 gene.
Torii T, Kawarai T, Nakamura S, Kawakami H
The human Nurr1 gene, linked to dopamine neuron development and brain disorders, has a highly conserved structure with mice and contains regulatory elements that control its activity. These elements respond to signals like cAMP and calcium, which may influence gene expression in conditions like Parkinson’s and schizophrenia. Understanding this gene’s regulation could help develop treatments targeting dopamine system dysfunction.
- Nurr1 is critical for midbrain dopamine neuron development
- Human Nurr1 gene has conserved regulatory regions across species
- Regulatory elements respond to cellular signals like cAMP and calcium
- Variants in Nurr1 may contribute to Parkinson’s or schizophrenia
- Gene regulation insights could inform future therapies
Molecular cloning of the human Nurr1 gene: characterization of the human gene and cDNAs.
Ichinose H, Ohye T, Suzuki T, Sumi-Ichinose C, Nomura T, Hagino Y, Nagatsu T
The human Nurr1 gene, which plays a key role in the development of dopamine-producing brain cells, has been fully mapped and characterized. Researchers identified its structure, regulatory regions, and a newly discovered splicing variant in the human brain.
- Nurr1 is essential for dopamine neuron development
- The human gene spans 8kb with eight exons
- Regulatory elements suggest control by key brain signaling pathways
- A new splicing variant was found in human fetal brain
- This gene is linked to Parkinson’s and neuropsychiatric conditions
Activity-dependent Nurr1 and NGFI-B gene expression in adult mouse olfactory bulb.
Liu N, Baker H
Nurr1 and NGFI-B are active in the olfactory bulb's dopamine cells and decrease when odor exposure is reduced, suggesting they help control dopamine production in this brain area. This may help explain how sensory input affects dopamine function in the brain.
- Nurr1 and NGFI-B are present in olfactory bulb dopamine cells
- Both genes decrease when odors are blocked
- They likely help regulate dopamine production in the olfactory bulb
- Sensory input influences dopamine-related gene activity
An isoform of Nurr1 functions as a negative inhibitor of the NGFI-B family signaling.
Ohkura N, Hosono T, Maruyama K, Tsukada T, Yamaguchi K
A shorter version of the Nurr1 protein, called Nurr2, acts as a natural brake on the activity of Nurr1 and related proteins, potentially affecting brain development and function. This brake may influence how genes are turned on or off in the brain and pituitary, and could play a role in NR4A2-related disorders.
- Nurr2 is a shorter form of the Nurr1 protein
- It blocks the activity of Nurr1 and related proteins
- Nurr2 is found in the brain and pituitary, like Nurr1
- It may regulate gene activity in the developing brain
- Could impact NR4A2-related neurological conditions
Prolonged expression of zinc finger immediate-early gene mRNAs and decreased protein synthesis following kainic acid induced seizures.
Honkaniemi J, Sharp FR
After seizures caused by kainic acid, certain genes that respond quickly to brain activity stay turned on longer in brain regions damaged by the seizure, especially in the hippocampus. This prolonged gene activity may be due to disrupted protein production, and it could signal either a protective response or early signs of cell death in stressed but still alive neurons.
- Seizures cause lasting gene activation in damaged brain areas
- Prolonged gene activity links to reduced protein production
- This may reflect neuron stress or early cell death pathways
- Hippocampus shows strongest and longest gene response
- Gene changes may signal vulnerability or protection
Differential expression of tyrosine hydroxylase in catecholaminergic neurons of neonatal wild-type and Nurr1-deficient mice.
Baffi JS, Palkovits M, Castillo SO, Mezey E, Nikodem VM
Nurr1 is essential for the development of dopamine-producing neurons in the brain, and its absence leads to a complete loss of the key dopamine enzyme tyrosine hydroxylase in specific brain regions, which explains why Nurr1-deficient mice die shortly after birth. However, some dopamine neurons remain unaffected, showing that Nurr1's role is selective and not required for all dopamine-producing cells.
- Nurr1 is critical for dopamine neuron development
- Loss of Nurr1 eliminates tyrosine hydroxylase in key brain areas
- Not all dopamine neurons depend on Nurr1
- Nurr1 is not expressed in norepinephrine-producing neurons
- This helps explain the severe neurological impact of NR4A2 mutations
Nurr1 mRNA expression in neonatal and adult rat brain following kainic acid-induced seizure activity.
Crispino M, Tocco G, Feldman JD, Herschman HR, Baudry M
Nurr1, a brain-specific gene linked to dopamine neuron development, increases rapidly in response to seizures in rats, especially in the hippocampus and cortex. The pattern of Nurr1 activation suggests it helps regulate brain responses to neuronal stress and may influence why some brain cells are more vulnerable to damage.
- Nurr1 rises quickly after seizures in rat brains
- Early in life, Nurr1 increases in seizure-resistant brain areas
- Prolonged Nurr1 activation occurs in areas damaged by seizures
- Nurr1 may help protect or determine vulnerability of brain cells
- This gene responds to brain activity and may influence recovery
The NGFI-B subfamily of the nuclear receptor superfamily (review).
Maruyama K, Tsukada T, Ohkura N, Bandoh S, Hosono T, Yamaguchi K
The NGFI-B subfamily of nuclear receptors, including Nurr1 (NR4A2), plays key roles in brain development, dopamine regulation, and cellular responses to stress and injury. While no natural ligands have been found, these proteins are critical for normal neurological function and are linked to neurodegenerative and psychiatric disorders.
- NR4A2 (Nurr1) is essential for dopamine neuron development and function
- NR4A2 regulates genes involved in brain health and inflammation
- Dysfunction in NR4A2 is linked to Parkinson’s and other neurological conditions
- No known drugs directly target NR4A2 yet, but it is a promising therapeutic focus
- NR4A2 is activated quickly in response to cellular stress
Dopamine biosynthesis is selectively abolished in substantia nigra/ventral tegmental area but not in hypothalamic neurons in mice with targeted disruption of the Nurr1 gene.
Castillo SO, Baffi JS, Palkovits M, Goldstein DS, Kopin IJ, Witta J, Magnuson MA, Nikodem VM
Mice without the Nurr1 gene cannot produce dopamine in brain regions critical for movement and reward, leading to death shortly after birth. The gene is essential for developing dopamine-producing neurons in the substantia nigra and ventral tegmental area, but not in other brain areas like the hypothalamus.
- Nurr1 is essential for dopamine production in key brain areas
- Without Nurr1, dopamine neurons in the brainstem fail to develop properly
- Dopamine loss leads to early death in mice
- Other brain regions unaffected, showing Nurr1's specific role
- L-DOPA treatment does not rescue the condition
On CNS repair and protection strategies: novel approaches with implications for spinal cord injury and Parkinson's disease.
Olson L, Cheng H, Zetterström RH, Solomin L, Jansson L, Giménez-Llort L, Hoffer BJ, Perlmann T
This paper discusses strategies to repair and protect the central nervous system, focusing on spinal cord injury and Parkinson's disease. It highlights the potential of Nurr1, a key protein in dopamine neuron development, as a target for new treatments that could protect neurons in Parkinson's disease.
- Nurr1 is critical for dopamine neuron development
- Targeting Nurr1 may lead to new Parkinson's treatments
- Peripheral nerve grafts show promise for spinal cord repair
- The brain has limited natural repair abilities
- New therapies aim to protect and regenerate neurons
Nurr1 is essential for the induction of the dopaminergic phenotype and the survival of ventral mesencephalic late dopaminergic precursor neurons.
Saucedo-Cardenas O, Quintana-Hau JD, Le WD, Smidt MP, Cox JJ, De Mayo F, Burbach JP, Conneely OM
Nurr1 is critical for the final development and survival of dopamine-producing brain cells. Without Nurr1, these cells fail to become fully functional dopamine neurons and instead die off, leading to a loss of dopamine-producing cells in the brain.
- Nurr1 is essential for dopamine neuron development
- Without Nurr1, dopamine cells don't mature properly
- Nurr1 prevents cell death in developing dopamine neurons
- Loss of Nurr1 leads to reduced dopamine neurons at birth
- Nurr1 acts at a late stage of neuron differentiation
A divergent role of COOH-terminal domains in Nurr1 and Nur77 transactivation.
Castillo SO, Xiao Q, Kostrouch Z, Dozin B, Nikodem VM
Nurr1 has a naturally occurring shorter form, Nurr1a, missing part of its tail end, which reduces its ability to turn on genes. This tail region is critical for Nurr1's function, unlike in a similar protein, Nur77, suggesting unique roles for Nurr1 in gene regulation.
- Nurr1 has a shorter natural form, Nurr1a, with a truncated tail
- The tail end of Nurr1 is essential for turning on genes
- Removing even 15 amino acids from the tail weakens Nurr1's activity
- Nurr1 and Nur77 respond differently to retinoid-like molecules
- This tail region may be key to Nurr1's function in brain development
Rat nurr1 is prominently expressed in perirhinal cortex, and differentially induced in the hippocampal dentate gyrus by electroconvulsive vs. kindled seizures.
Xing G, Zhang L, Zhang L, Heynen T, Li XL, Smith MA, Weiss SR, Feldman AN, Detera-Wadleigh S, Chuang DM, Post RM
The rat Nurr1 protein is highly active in brain regions linked to memory, and its levels spike quickly in a specific memory-related brain area after electric shock seizures, but not consistently after other seizure types. This suggests Nurr1 may help regulate memory processes and respond to brain stress.
- Nurr1 is highly active in brain areas tied to memory
- Seizures from electric shock rapidly boost Nurr1 in memory circuits
- Kindled seizures do not reliably increase Nurr1
- Nurr1 acts like an immediate-early gene in the brain
- This may point to a role in memory and brain adaptation
Expression of zinc finger immediate early genes in rat brain after permanent middle cerebral artery occlusion.
Honkaniemi J, States BA, Weinstein PR, Espinoza J, Sharp FR
This study found that NR4A2 (also known as Nurr1) and other zinc finger immediate early genes are strongly activated in specific brain regions after stroke in rats, with prolonged expression in areas linked to delayed neuronal death. The sustained presence of these genes, especially NGFI-A in the thalamus, may signal neurons that are slowly dying, offering a potential biological marker for ongoing damage.
- NR4A2/Nurr1 is rapidly induced after brain ischemia
- Prolonged gene expression correlates with delayed neuron death
- Specific brain regions show sustained activation post-stroke
- NGFI-A expression may mark slowly dying neurons
- These genes could serve as indicators of ongoing brain injury
Organization, sequence, chromosomal localization, and promoter identification of the mouse orphan nuclear receptor Nurr1 gene.
Castillo SO, Xiao Q, Lyu MS, Kozak CA, Nikodem VM
The mouse Nurr1 gene, which is linked to brain development and function, has a specific structure with eight exons and seven introns, and its activity is controlled by a promoter region with multiple regulatory elements that respond to various signals.
- Nurr1 gene is 7 kb long with eight exons and seven introns
- Two transcription start sites are located in the first untranslated exon
- Promoter region contains response elements for stress, hormone, and signaling pathways
- Regulatory elements explain differences between Nurr1 and its close relative Nur77
- Findings help clarify how Nurr1 is turned on and regulated in the brain
Dopamine neuron agenesis in Nurr1-deficient mice.
Zetterström RH, Solomin L, Jansson L, Hoffer BJ, Olson L, Perlmann T
Mice without the Nurr1 gene fail to develop dopamine neurons in the brain, leading to severe movement problems and early death. This shows Nurr1 is essential for forming these neurons, suggesting that drugs targeting Nurr1 could help treat Parkinson's disease and related conditions.
- Nurr1 is essential for forming dopamine neurons
- Without Nurr1, mice lack key brain neurons and die young
- Nurr1 may be a target for treating Parkinson's
- Reduced dopamine in Nurr1-lacking adults
- Potential for Nurr1-targeting therapies
Cloning and structural organization of the gene encoding the murine nuclear receptor transcription factor, NURR1.
Saucedo-Cardenas O, Kardon R, Ediger TR, Lydon JP, Conneely OM
This study identified and mapped the structure of the mouse NURR1 gene, showing it has 7 exons and 6 introns and shares features with related genes, which helps explain how the gene is turned on in response to signals like cAMP.
- NURR1 gene is 6.2 kb with 7 exons and 6 introns
- No TATA box; promoter is GC-rich and cAMP-responsive
- Structure helps explain how NURR1 is activated quickly
- Provides foundation for studying gene regulation in development
Neuroendocrine regulation of the hypothalamic pituitary adrenal axis by the nurr1/nur77 subfamily of nuclear receptors.
Murphy EP, Conneely OM
The NR4A2 protein (also called Nurr1) helps control stress hormone production by regulating key genes in the brain and pituitary gland. It works with another related protein, Nur77, to turn on the POMC gene in response to stress signals and also helps shut it down when stress hormones are high. This dual role suggests NR4A2 is a central switch in managing the body's stress response.
- NR4A2/Nurr1 regulates stress hormone genes like POMC
- NR4A2 is activated by stress signals in the pituitary
- NR4A2 helps both turn on and turn off stress responses
- NR4A2 works with cAMP and glucocorticoid signals
- This system is critical for balancing the body's stress response
Retinoid X receptor heterodimerization and developmental expression distinguish the orphan nuclear receptors NGFI-B, Nurr1, and Nor1.
Zetterström RH, Solomin L, Mitsiadis T, Olson L, Perlmann T
NR4A2 (Nurr1) and two related proteins, NGFI-B and Nor1, behave differently in how they interact with other receptors during brain development. While Nurr1 and NGFI-B team up with RXR to regulate genes important for dopamine neuron formation, Nor1 cannot form these partnerships, suggesting unique roles for each protein. This helps explain why losing NGFI-B doesn’t cause obvious problems in mice, possibly due to functional overlap among these proteins.
- Nurr1 and NGFI-B work with RXR to control brain development
- Nor1 cannot partner with RXR, unlike the other two
- Nurr1 is active in brain regions that make dopamine neurons
- The three proteins overlap in some tissues, suggesting shared roles
- Redundancy may explain why missing NGFI-B causes no clear symptoms
Distribution of messenger RNAs for the orphan nuclear receptors Nurr1 and Nur77 (NGFI-B) in adult rat brain using in situ hybridization.
Xiao Q, Castillo SO, Nikodem VM
Nurr1 and Nur77 are brain proteins with distinct patterns of expression in rats, suggesting they control different genes and functions. Nurr1 is mainly found in areas critical for memory, movement, and emotion, while Nur77 is widespread, especially in the cortex and brainstem.
- Nurr1 is high in memory and movement brain areas
- Nurr1 is absent in the brainstem and cerebellum outer layers
- Nur77 is widespread, especially in the cortex and brainstem
- The two proteins likely regulate different genes in the brain
- Their distinct patterns suggest unique roles in brain function
Cellular expression of the immediate early transcription factors Nurr1 and NGFI-B suggests a gene regulatory role in several brain regions including the nigrostriatal dopamine system.
Zetterström RH, Williams R, Perlmann T, Olson L
Nurr1 is active in dopamine-producing brain cells and helps control genes essential for their development and function, with its loss linked to the degeneration seen in Parkinson's disease. This suggests Nurr1 plays a critical role in maintaining healthy dopamine neurons.
- Nurr1 is found in dopamine neurons in the brain
- Nurr1 levels drop when dopamine neurons die
- Nurr1 helps regulate genes needed for neuron development
- This process is relevant to Parkinson's disease
- Nurr1 may be a target for future treatments
Effects of phencyclidine on immediate early gene expression in the brain.
Näkki R, Sharp FR, Sagar SM, Honkaniemi J
Phencyclidine (PCP) causes lasting changes in brain activity, especially in regions linked to schizophrenia-like symptoms and neuron damage. It triggers immediate-early genes in multiple brain areas, with prolonged activation in the posterior cingulate cortex and cerebellar Purkinje cells—regions that are also damaged by PCP. This suggests these genes may play a role in either protecting or harming neurons during brain stress.
- PCP activates brain regions involved in schizophrenia-like symptoms
- Prolonged gene activity occurs in areas damaged by PCP
- Nurr1 (NR4A2) is induced in the posterior cingulate cortex and cerebellum
- Gene changes return to normal within 24 hours
- Higher PCP dose causes stronger and more widespread effects
Global ischemia induces immediate-early genes encoding zinc finger transcription factors.
Honkaniemi J, Sharp FR
After brain ischemia, certain genes that control brain cell activity remain active for hours or days in specific brain regions. In areas where neurons die, one gene called NGFI-A stays on longer, possibly contributing to cell death, while in surviving neurons, other genes stay active and may help protect them. This suggests that prolonged gene activity can either harm or protect brain cells after injury.
- Some genes stay active after brain ischemia
- Persistent NGFI-A may contribute to neuron death in vulnerable areas
- Surviving neurons show long-lasting activity of protective genes
- Gene overactivity may result from disrupted feedback mechanisms
- These genes could be targets for protecting brain cells after injury
HZF-3, an immediate-early orphan receptor homologous to NURR1/NOT: induction upon membrane depolarization and seizures.
Peña de Ortiz S, Jamieson GA
HZF-3 is a brain-specific protein closely related to NURR1, a gene linked to NR4A2-related syndrome. It activates in response to brain activity and seizures, suggesting it helps regulate genes involved in brain function and stress responses.
- HZF-3 is similar to NURR1, the protein missing in NR4A2-related syndrome
- It turns on when brain cells are active or under stress like seizures
- It binds DNA in the same way as NURR1, likely controlling similar genes
- Its activation lasts longer than other stress-response genes
- May help regulate brain responses to injury or overactivity
Inhibition of Nur77/Nurr1 leads to inefficient clonal deletion of self-reactive T cells.
Zhou T, Cheng J, Yang P, Wang Z, Liu C, Su X, Bluethmann H, Mountz JD
Blocking the NR4A2/NURR1 protein in T cells prevents the normal elimination of self-reactive immune cells in the thymus, increasing the risk of autoimmune reactions. However, the body still maintains immune tolerance through alternative pathways in the lymph nodes and spleen.
- NR4A2/NURR1 is essential for deleting self-reactive T cells in the thymus
- Blocking NR4A2/NURR1 leads to more self-reactive T cells escaping the thymus
- Tolerance is preserved via Fas-dependent elimination in lymph nodes
- These T cells remain functionally inactive (anergic) despite escaping deletion
- This suggests compensatory immune control mechanisms exist