2022
Sexual dimorphism in a neuronal mechanism of spinal hyperexcitability across rodent and human models of pathological pain
Dedek A, Xu J, Lorenzo LÉ, Godin AG, Kandegedara CM, Glavina G, Landrigan JA, Lombroso PJ, De Koninck Y, Tsai EC, Hildebrand ME. Sexual dimorphism in a neuronal mechanism of spinal hyperexcitability across rodent and human models of pathological pain. Brain 2022, 145: 1124-1138. PMID: 35323848, PMCID: PMC9050559, DOI: 10.1093/brain/awab408.Peer-Reviewed Original ResearchConceptsBrain-derived neurotrophic factorSuperficial dorsal horn neuronsDorsal horn neuronsFemale ratsNeurotrophic factorNeuronal mechanismsCentral neuronal mechanismsSpinal nociceptive circuitsSpinal pain processingSuperficial dorsal hornChronic pain syndromeLamina I neuronsPreclinical pain modelsHuman organ donorsSynaptic NMDAR responsesNMDAR potentiationSpinal hyperexcitabilityInflammatory painNociceptive circuitsPain syndromeTactile allodyniaDorsal hornPain modelPathological painLaminae I
2020
Antibodies From Children With PANDAS Bind Specifically to Striatal Cholinergic Interneurons and Alter Their Activity
Xu J, Liu RJ, Fahey S, Frick L, Leckman J, Vaccarino F, Duman RS, Williams K, Swedo S, Pittenger C. Antibodies From Children With PANDAS Bind Specifically to Striatal Cholinergic Interneurons and Alter Their Activity. American Journal Of Psychiatry 2020, 178: 48-64. PMID: 32539528, PMCID: PMC8573771, DOI: 10.1176/appi.ajp.2020.19070698.Peer-Reviewed Original ResearchConceptsStriatal cholinergic interneuronsCholinergic interneuronsMouse brain slicesObsessive-compulsive disorderControl subjectsBrain slicesPediatric autoimmune neuropsychiatric disordersIntravenous immunoglobulin treatmentAutoimmune neuropsychiatric disordersAcute mouse brain slicesParvalbumin-expressing GABAergic interneuronsPediatric obsessive-compulsive disorderBrain antigensImmunoglobulin treatmentBaseline serumStreptococcal infectionCritical cellular targetsSymptom improvementGABAergic interneuronsInduced autoimmunityIgG antibodiesMouse slicesIndependent cohortBehavioral pathologyNeuron typesInhibition of striatal-enriched protein tyrosine phosphatase (STEP) activity reverses behavioral deficits in a rodent model of autism
Chatterjee M, Singh P, Xu J, Lombroso PJ, Kurup PK. Inhibition of striatal-enriched protein tyrosine phosphatase (STEP) activity reverses behavioral deficits in a rodent model of autism. Behavioural Brain Research 2020, 391: 112713. PMID: 32461127, PMCID: PMC7346720, DOI: 10.1016/j.bbr.2020.112713.Peer-Reviewed Original ResearchAnimalsAutism Spectrum DisorderAutistic DisorderBehavior, AnimalDisease Models, AnimalExploratory BehaviorFemaleInhibition, PsychologicalMaleMiceMice, Inbred C57BLNeuronal PlasticityPrefrontal CortexPregnancyPrenatal Exposure Delayed EffectsProtein Tyrosine PhosphatasesProtein Tyrosine Phosphatases, Non-ReceptorSocial BehaviorStereotyped BehaviorValproic Acid
2019
Loss of STEP61 couples disinhibition to N-methyl-d-aspartate receptor potentiation in rodent and human spinal pain processing
Dedek A, Xu J, Kandegedara CM, Lorenzo LÉ, Godin AG, De Koninck Y, Lombroso PJ, Tsai EC, Hildebrand ME. Loss of STEP61 couples disinhibition to N-methyl-d-aspartate receptor potentiation in rodent and human spinal pain processing. Brain 2019, 142: 1535-1546. PMID: 31135041, PMCID: PMC6536915, DOI: 10.1093/brain/awz105.Peer-Reviewed Original ResearchConceptsN-methyl-D-aspartate receptorsLaminae INMDAR responsesDorsal horn synapsesSpinal pain processingNerve injury modelSpinal dorsal hornSynaptic NMDAR responsesTyrosine phosphatase STEP61Loss of inhibitionBehavioral hypersensitivityInflammatory painNeuropathic painDorsal hornPain statesPathological painPain targetsChronic painPain processingInjury modelAssociated downregulationRodent modelsReceptor potentiationPainSTEP61 activity
2018
Striatal Signaling Regulated by the H3R Histamine Receptor in a Mouse Model of tic Pathophysiology
Rapanelli M, Frick L, Jindachomthong K, Xu J, Ohtsu H, Nairn A, Pittenger C. Striatal Signaling Regulated by the H3R Histamine Receptor in a Mouse Model of tic Pathophysiology. Neuroscience 2018, 392: 172-179. PMID: 30278251, PMCID: PMC6204318, DOI: 10.1016/j.neuroscience.2018.09.035.Peer-Reviewed Original ResearchConceptsHDC-KO miceMitogen-activated protein kinaseHistamine receptorsWT animalsDorsal striatumH3R activationTic-like movementsStriatonigral medium spiny neuronsAkt phosphorylationMedium spiny neuronsWild-type miceRare genetic causeHistamine dysregulationAgonist treatmentKO miceSpiny neuronsTic disordersTic pathophysiologyStriatal signalingMouse modelNeuropsychiatric diseasesKO modelRepetitive movementsStriatumMiceStriatal-Enriched Protein-Tyrosine Phosphatase (STEP)
Kurup P, Xu J, Chatterjee M, Goebel-Goody S, Paul S, Lombroso P. Striatal-Enriched Protein-Tyrosine Phosphatase (STEP). 2018, 5188-5203. DOI: 10.1007/978-3-319-67199-4_630.Peer-Reviewed Original Research
2017
Glutathione-Responsive Selenosulfide Prodrugs as a Platform Strategy for Potent and Selective Mechanism-Based Inhibition of Protein Tyrosine Phosphatases
Tjin CC, Otley KD, Baguley TD, Kurup P, Xu J, Nairn AC, Lombroso PJ, Ellman JA. Glutathione-Responsive Selenosulfide Prodrugs as a Platform Strategy for Potent and Selective Mechanism-Based Inhibition of Protein Tyrosine Phosphatases. ACS Central Science 2017, 3: 1322-1328. PMID: 29296673, PMCID: PMC5746864, DOI: 10.1021/acscentsci.7b00486.Peer-Reviewed Original ResearchStriatal-enriched protein tyrosine phosphataseProtein tyrosineTyrosine phosphatasePhosphatase inhibitorProtein tyrosine phosphataseProtein tyrosine phosphorylation levelsActive site cysteineProtein tyrosine phosphorylationTyrosine phosphorylation levelsHuman PTPsSite cysteinePTP targetsTyrosine phosphorylationRepresentative cysteine proteaseCysteine proteasesHuman diseasesCellular activitiesPhosphorylation levelsVirulence factorsEssential roleSelective mechanismIntracellular GSH concentrationSelective active sitesNeurodegenerative diseasesPTPSynaptic NMDA Receptor Activation Induces Ubiquitination and Degradation of STEP61
Xu J, Kurup P, Nairn AC, Lombroso PJ. Synaptic NMDA Receptor Activation Induces Ubiquitination and Degradation of STEP61. Molecular Neurobiology 2017, 55: 3096-3111. PMID: 28466270, PMCID: PMC5668205, DOI: 10.1007/s12035-017-0555-x.Peer-Reviewed Original ResearchConceptsMK-801-treated miceProtein tyrosine Phosphatase 61GluN1/GluN2B receptorsNMDA receptor signalingD-serine treatmentMouse frontal cortexNMDAR signalingSynaptic NMDARsCortical samplesHuman schizophreniaTherapeutic effectFrontal cortexGluN2B receptorsSynaptic plasticityNeurological disordersCognitive deficitsReceptor signalingD-serineSTEP61SchizophreniaBicucullineMiceProteasomal degradationSurface localizationSignaling
2016
Striatal-Enriched Protein-Tyrosine Phosphatase (STEP)
Kurup P, Xu J, Chatterjee M, Goebel-Goody S, Paul S, Lombroso P. Striatal-Enriched Protein-Tyrosine Phosphatase (STEP). 2016, 1-16. DOI: 10.1007/978-1-4614-6438-9_630-1.Peer-Reviewed Original ResearchPotentiation of Synaptic GluN2B NMDAR Currents by Fyn Kinase Is Gated through BDNF-Mediated Disinhibition in Spinal Pain Processing
Hildebrand ME, Xu J, Dedek A, Li Y, Sengar AS, Beggs S, Lombroso PJ, Salter MW. Potentiation of Synaptic GluN2B NMDAR Currents by Fyn Kinase Is Gated through BDNF-Mediated Disinhibition in Spinal Pain Processing. Cell Reports 2016, 17: 2753-2765. PMID: 27926876, DOI: 10.1016/j.celrep.2016.11.024.Peer-Reviewed Original ResearchConceptsBrain-derived neurotrophic factorN-methyl-D-aspartate receptorsLaminae INeurotrophin brain-derived neurotrophic factorPeripheral nerve injury modelSynaptic N-methyl-D-aspartate receptorsBDNF-TrkB signalingSpinal pain processingNerve injury modelChronic pain statesActivation of TrkBNMDAR dysregulationNMDAR potentiationPain amplificationPain hypersensitivityNeuropathic painPain statesPain processingNeurotrophic factorSpinal neuronsSynaptic excitationSynaptic inhibitionNMDAR currentsInjury modelPotentiationSTEP activation by Gαq coupled GPCRs opposes Src regulation of NMDA receptors containing the GluN2A subunit
Tian M, Xu J, Lei G, Lombroso PJ, Jackson MF, MacDonald JF. STEP activation by Gαq coupled GPCRs opposes Src regulation of NMDA receptors containing the GluN2A subunit. Scientific Reports 2016, 6: 36684. PMID: 27857196, PMCID: PMC5114553, DOI: 10.1038/srep36684.Peer-Reviewed Original ResearchConceptsStriatal-enriched protein tyrosine phosphataseFamily of kinasesProtein tyrosine phosphataseM1R stimulationN-methyl-D-aspartate receptorsM1 muscarinic acetylcholine receptorSrc recruitmentTyrosine phosphataseSrc regulationNMDAR functionIntracellular Ca2Step activationMuscarinic acetylcholine receptorsGluN2A subunitGαqAcetylcholine receptorsHigh intracellular Ca2Function of NMDARsSynaptic plasticityPhosphataseNMDAR activationActivationReceptorsRecruitmentCa2Inhibition of STEP61 ameliorates deficits in mouse and hiPSC-based schizophrenia models
Xu J, Hartley BJ, Kurup P, Phillips A, Topol A, Xu M, Ononenyi C, Foscue E, Ho SM, Baguley TD, Carty N, Barros CS, Müller U, Gupta S, Gochman P, Rapoport J, Ellman JA, Pittenger C, Aronow B, Nairn AC, Nestor MW, Lombroso PJ, Brennand KJ. Inhibition of STEP61 ameliorates deficits in mouse and hiPSC-based schizophrenia models. Molecular Psychiatry 2016, 23: 271-281. PMID: 27752082, PMCID: PMC5395367, DOI: 10.1038/mp.2016.163.Peer-Reviewed Original ResearchConceptsBrain-specific tyrosine phosphataseDephosphorylation of GluN2BExtracellular signal-regulated kinase 1/2Signal-regulated kinase 1/2Glutamate receptor internalizationPluripotent stem cellsKnockout mouse modelTyrosine phosphataseMouse modelKinase 1/2Receptor internalizationImportant regulatorGenetic reductionLoss of NMDARsStem cellsN-methyl DPharmacological inhibitionProtein levelsSynaptic functionSTEP61Patient cohortForebrain neuronsBehavioral deficitsExcitatory neuronsSchizophrenia model
2015
Inhibition of the tyrosine phosphatase STEP61 restores BDNF expression and reverses motor and cognitive deficits in phencyclidine-treated mice
Xu J, Kurup P, Baguley TD, Foscue E, Ellman JA, Nairn AC, Lombroso PJ. Inhibition of the tyrosine phosphatase STEP61 restores BDNF expression and reverses motor and cognitive deficits in phencyclidine-treated mice. Cellular And Molecular Life Sciences 2015, 73: 1503-1514. PMID: 26450419, PMCID: PMC4801664, DOI: 10.1007/s00018-015-2057-1.Peer-Reviewed Original ResearchMeSH KeywordsAnimalsBenzothiepinsBrain-Derived Neurotrophic FactorCells, CulturedCognition DisordersCREB-Binding ProteinDown-RegulationMaleMiceMice, Inbred C57BLMitogen-Activated Protein Kinase 1Mitogen-Activated Protein Kinase 3Motor ActivityNeuronsPhencyclidinePhosphorylationProtein Tyrosine PhosphatasesReceptors, N-Methyl-D-AspartateRNA InterferenceUbiquitinationConceptsBrain-derived neurotrophic factorBDNF expressionProtein tyrosine Phosphatase 61Cognitive deficitsPCP-induced reductionPCP-treated micePhencyclidine-treated micePCP-induced increasePCP-induced hyperlocomotionTyrosine phosphatase STEP61STEP61 levelsBDNF transcriptionNeurotrophic factorNMDAR antagonistsCortical culturesCortical neuronsCNS disordersSynaptic strengtheningPsychotic episodeRodent modelsBrain disordersPharmacologic inhibitionSTEP61SchizophreniaCognitive functioningRegulation of STEP61 and tyrosine-phosphorylation of NMDA and AMPA receptors during homeostatic synaptic plasticity
Jang SS, Royston SE, Xu J, Cavaretta JP, Vest MO, Lee KY, Lee S, Jeong HG, Lombroso PJ, Chung HJ. Regulation of STEP61 and tyrosine-phosphorylation of NMDA and AMPA receptors during homeostatic synaptic plasticity. Molecular Brain 2015, 8: 55. PMID: 26391783, PMCID: PMC4578242, DOI: 10.1186/s13041-015-0148-4.Peer-Reviewed Original ResearchConceptsN-methyl-D-aspartate receptorsHomeostatic synaptic plasticitySynaptic plasticityTyrosine phosphorylationActivity blockadeDephosphorylation of GluN2BSynaptic scalingProtein tyrosine phosphataseLevel of GluN2BProlonged activity blockadeExcitatory synaptic transmissionHippocampal cultured neuronsIsoxazolepropionic acid (AMPA) receptorsNMDAR subunit GluN2BActivity-dependent regulationTyrosine phosphataseSTEP61 levelsHomeostatic stabilizationSynaptic transmissionExcitatory synapsesAMPA receptorsGluA2 expressionPostsynaptic accumulationCultured neuronsAcid receptorsDown‐regulation of BDNF in cell and animal models increases striatal‐enriched protein tyrosine phosphatase 61 (STEP61) levels
Xu J, Kurup P, Azkona G, Baguley TD, Saavedra A, Nairn AC, Ellman JA, Pérez-Navarro E, Lombroso PJ. Down‐regulation of BDNF in cell and animal models increases striatal‐enriched protein tyrosine phosphatase 61 (STEP61) levels. Journal Of Neurochemistry 2015, 136: 285-294. PMID: 26316048, PMCID: PMC4769989, DOI: 10.1111/jnc.13295.Peer-Reviewed Original ResearchMeSH KeywordsAnimalsBenzothiepinsBrainBrain-Derived Neurotrophic FactorCells, CulturedCysteine Proteinase InhibitorsDown-RegulationEmbryo, MammalianFemaleFlavonesLeupeptinsMaleMiceMice, Inbred C57BLMice, TransgenicMotor ActivityNeuronsProtein Tyrosine PhosphatasesRatsRats, Sprague-DawleyRNA, Small InterferingTime FactorsConceptsBrain-derived neurotrophic factorNormal cognitive functionSynaptic strengtheningStriatal-enriched protein tyrosine phosphataseBDNF expressionBDNF knockdownCortical culturesRegulation of BDNFN-methyl-D-aspartate receptor functionNeuropsychiatric disordersCognitive functionBetter therapeutic strategiesMouse frontal cortexNMDA receptor subunit GluN2BSTEP61 levelsHyperlocomotor activityMotor abnormalitiesNeurotrophic factorNMDA receptorsFrontal cortexKinase B signalingTherapeutic strategiesAgonists resultsAnimal modelsCultured neuronsBDNF Induces Striatal-Enriched Protein Tyrosine Phosphatase 61 Degradation Through the Proteasome
Saavedra A, Puigdellívol M, Tyebji S, Kurup P, Xu J, Ginés S, Alberch J, Lombroso PJ, Pérez-Navarro E. BDNF Induces Striatal-Enriched Protein Tyrosine Phosphatase 61 Degradation Through the Proteasome. Molecular Neurobiology 2015, 53: 4261-4273. PMID: 26223799, PMCID: PMC4738169, DOI: 10.1007/s12035-015-9335-7.Peer-Reviewed Original ResearchMeSH KeywordsAnimalsBrain-Derived Neurotrophic FactorCerebral CortexExtracellular Signal-Regulated MAP KinasesHippocampusMembrane PotentialsMiceNeostriatumNerve Growth FactorNeuronsNeurotrophin 3Phospholipase C gammaPhosphorylationProteasome Endopeptidase ComplexProtein Tyrosine Phosphatases, Non-ReceptorProteolysisReceptors, N-Methyl-D-AspartateUbiquitinationConceptsBrain-derived neurotrophic factorSTEP61 levelsCortical neuronsUbiquitin-proteasome systemStriatal-enriched protein tyrosine phosphatasePrimary cortical neuronsLevels/activitiesNerve growth factorNeurotrophic factorNeurotrophin-3Cultured striatalHippocampal neuronsCell depolarizationGrowth factorERK1/2 phosphorylationNeuronsStriatalTyrosine kinasePhospholipase C-gammaC gammaDifferent mechanismsLevelsBlockadeGluN2BProtein tyrosine phosphataseStriatal‐enriched protein tyrosine phosphatase regulates the PTPα/Fyn signaling pathway
Xu J, Kurup P, Foscue E, Lombroso PJ. Striatal‐enriched protein tyrosine phosphatase regulates the PTPα/Fyn signaling pathway. Journal Of Neurochemistry 2015, 134: 629-641. PMID: 25951993, PMCID: PMC4516628, DOI: 10.1111/jnc.13160.Peer-Reviewed Original ResearchConceptsProtein tyrosine phosphataseProtein kinase ARegulation of FynTyrosine phosphataseReceptor-type protein tyrosine phosphatase alphaProtein tyrosine phosphatase alphaStriatal-enriched protein tyrosine phosphataseRegulatory tyrosine residuesActivation of FynTyrosine kinase FynRegulatory tyrosineProtein tyrosinePTPαKinase FynSynaptic membranesKinase ATyrosine residuesFyn activityFynNovel substratePrimary neuronal culturesSTEP61Synergistic regulationMolecular techniquesNovel mechanismDevelopmental control of polycomb subunit composition by GATA factors mediates a switch to non-canonical functions.
Xu J, Shao Z, Li D, Xie H, Kim W, Huang J, Taylor JE, Pinello L, Glass K, Jaffe JD, Yuan GC, Orkin SH. Developmental control of polycomb subunit composition by GATA factors mediates a switch to non-canonical functions. Molecular Cell 2015, 57: 304-316. PMID: 25578878, PMCID: PMC4305004, DOI: 10.1016/j.molcel.2014.12.009.Peer-Reviewed Original ResearchSTEP61 is a substrate of the E3 ligase parkin and is upregulated in Parkinson’s disease
Kurup PK, Xu J, Videira RA, Ononenyi C, Baltazar G, Lombroso PJ, Nairn AC. STEP61 is a substrate of the E3 ligase parkin and is upregulated in Parkinson’s disease. Proceedings Of The National Academy Of Sciences Of The United States Of America 2015, 112: 1202-1207. PMID: 25583483, PMCID: PMC4313846, DOI: 10.1073/pnas.1417423112.Peer-Reviewed Original ResearchMeSH KeywordsAnimalsCorpus StriatumCyclic AMP Response Element-Binding ProteinDown-RegulationGene Expression Regulation, EnzymologicHEK293 CellsHumansMAP Kinase Signaling SystemMiceMice, KnockoutMitogen-Activated Protein Kinase 3MPTP PoisoningProtein Tyrosine Phosphatases, Non-ReceptorRatsRats, Sprague-DawleyUbiquitinationUbiquitin-Protein LigasesUp-RegulationConceptsE3 ubiquitin ligase ParkinSubstantia nigra pars compactaPathophysiology of PDProtein tyrosine phosphataseUbiquitin ligase ParkinSporadic Parkinson's diseaseE3 ligase ParkinRegulation of ParkinParkinson's diseaseTyrosine phosphataseParkin mutantsE3 ligaseProteasome systemDopaminergic neuronsDownstream targetsAutosomal recessive juvenile parkinsonismNovel substrateSTEP61ParkinCellular modelSTEP61 levelsSNc dopaminergic neuronsProtein levelsFunction contributesERK1/2
2014
Inhibitor of the Tyrosine Phosphatase STEP Reverses Cognitive Deficits in a Mouse Model of Alzheimer's Disease
Xu J, Chatterjee M, Baguley TD, Brouillette J, Kurup P, Ghosh D, Kanyo J, Zhang Y, Seyb K, Ononenyi C, Foscue E, Anderson GM, Gresack J, Cuny GD, Glicksman MA, Greengard P, Lam TT, Tautz L, Nairn AC, Ellman JA, Lombroso PJ. Inhibitor of the Tyrosine Phosphatase STEP Reverses Cognitive Deficits in a Mouse Model of Alzheimer's Disease. PLOS Biology 2014, 12: e1001923. PMID: 25093460, PMCID: PMC4122355, DOI: 10.1371/journal.pbio.1001923.Peer-Reviewed Original ResearchMeSH KeywordsAlzheimer DiseaseAmino Acid SequenceAnimalsBenzothiepinsCatalytic DomainCell DeathCerebral CortexCognition DisordersCysteineDisease Models, AnimalEnzyme InhibitorsHigh-Throughput Screening AssaysHumansMaleMice, Inbred C57BLMice, KnockoutMolecular Sequence DataNeuronsPhosphorylationPhosphotyrosineProtein Tyrosine Phosphatases, Non-ReceptorSubstrate SpecificityConceptsInhibitors of stepsSpecificity of inhibitorsIsoxazolepropionic acid receptor (AMPAR) traffickingCatalytic cysteinePTP inhibitorsTyrosine phosphataseTyrosine phosphorylationSecondary assaysSTEP KO miceReceptor traffickingFirst large-scale effortN-methyl-D-aspartate receptorsPyk2 activitySTEP inhibitorLarge-scale effortsNovel therapeutic targetSynaptic functionAlzheimer's diseaseNeurodegenerative disordersCortical cellsTherapeutic targetERK1/2Specificity experimentsPhosphataseInhibitors