Search results for "Tyrosine phosphorylation"

showing 10 items of 32 documents

Defining Human Tyrosine Kinase Phosphorylation Networks Using Yeast as an In Vivo Model Substrate.

2017

Systematic assessment of tyrosine kinase-substrate relationships is fundamental to a better understanding of cellular signaling and its profound alterations in human diseases such as cancer. In human cells, such assessments are confounded by complex signaling networks, feedback loops, conditional activity, and intra-kinase redundancy. Here we address this challenge by exploiting the yeast proteome as an in vivo model substrate. We individually expressed 16 human non-receptor tyrosine kinases (NRTKs) in Saccharomyces cerevisiae and identified 3,279 kinase-substrate relationships involving 1,351 yeast phosphotyrosine (pY) sites. Based on the yeast data without prior information, we generated …

0301 basic medicineCell signalingHistologySaccharomyces cerevisiae ProteinsSaccharomyces cerevisiaeAmino Acid MotifsSaccharomyces cerevisiaeInteractomeReceptor tyrosine kinaseArticlePathology and Forensic Medicine03 medical and health scienceschemistry.chemical_compoundHumansProtein Interaction MapsPhosphorylationbiologyTyrosine phosphorylationCell BiologyProtein-Tyrosine Kinasesbiology.organism_classificationYeastCell biology030104 developmental biologychemistrybiology.proteinPhosphorylationTyrosine kinaseSequence AlignmentCell systems
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Serotonin Heteroreceptor Complexes and Their Integration of Signals in Neurons and Astroglia—Relevance for Mental Diseases

2021

The heteroreceptor complexes present a novel biological principle for signal integration. These complexes and their allosteric receptor–receptor interactions are bidirectional and novel targets for treatment of CNS diseases including mental diseases. The existence of D2R-5-HT2AR heterocomplexes can help explain the anti-schizophrenic effects of atypical antipsychotic drugs not only based on blockade of 5-HT2AR and of D2R in higher doses but also based on blocking the allosteric enhancement of D2R protomer signaling by 5-HT2AR protomer activation. This research opens a new understanding of the integration of DA and 5-HT signals released from DA and 5-HT nerve terminal networks. The biologica…

0301 basic medicineReviewheteroreceptor complexesTropomyosin receptor kinase BReceptor tyrosine kinasechemistry.chemical_compound0302 clinical medicineG protein-coupled receptorsserotonin receptorsReceptor Serotonin 5-HT2ABiology (General)astrogliabiologyChemistryMental DisordersBrainGeneral MedicineAntidepressive AgentsdepressionG protein-coupled receptors; astroglia; depression; heteroreceptor complexes; rapid antidepressant drugs; receptor tyrosine kinase; serotonin receptors.medicine.symptomAntipsychotic AgentsSerotonergic NeuronsSignal TransductionProto-oncogene tyrosine-protein kinase Srcserotonin receptorheteroreceptor complexeQH301-705.5Astroglia; Depression; G protein-coupled receptors; Heteroreceptor complexes; Rapid antidepressant drugs; Receptor tyrosine kinase; Serotonin receptors;Allosteric regulationserotonin receptors heteroreceptor complexes depression astroglia receptor tyrosine kinase rapid antidepressant drugs G protein-coupled receptors.depression astroglia receptor tyrosine kinase rapid antidepressant drugs G protein-coupled receptorsHeteroreceptorNO03 medical and health sciencesmedicineAnimalsHumansReceptor Fibroblast Growth Factor Type 1rapid antidepressant drugsG protein-coupled receptorReceptors Dopamine D2Dopaminergic NeuronsTyrosine phosphorylationReceptor Cross-TalkReceptor Galanin Type 1Receptor Galanin Type 2030104 developmental biologyMechanism of actionAstrocytesreceptor tyrosine kinasebiology.proteinReceptors Serotonin 5-HT1Neuroscience030217 neurology & neurosurgeryCells
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The Imatinib and Nilotinib Induced Modulation of the Proteasomal Activity and Antigen Processing in Chronic Myeloid Leukemia Cells

2011

Abstract Abstract 2748 The tyrosine kinase inhibitors (TKIs) Imatinib mesylate (IM, Gleevec, Glivec) and nilotinib (NI, Tasigna, AMN) are currently used in treatment of chronic myeloid leukaemia (CML). IM has been described to influence the function and differentiation of antigen presenting cells, to inhibit the effector function of T lymphocytes and to decrease the immunogenicity of CML cells by downregulation of tumor associated antigens. In the present study, we analyzed the effect of IM and NI on proteasomal activity in IM-sensitive or IM/NI- resistant CML cells as well as in patient samples using a biotinylated active site-directed probe, which, covalently binds and labels proteasomal …

Antigen processingImmunologyTyrosine phosphorylationCell BiologyHematologyBiologyBiochemistryMolecular biologyEpitopechemistry.chemical_compoundImatinib mesylateAntigenchemistryPhosphorylationAntigen-presenting cellTyrosine kinaseBlood
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Thiol antioxidants block the activation of antigen-presenting cells by contact sensitizers.

2003

Strong contact sensitizers are able to induce signal transduction mechanisms such as tyrosine phosphorylation and activation of MAP kinases in antigen-presenting cells. We studied the capacity of different antioxidants (ascorbic acid, alpha-tocopherol, pyrrolidine dithiocarbamate, N-acetylcysteine, and glutathione) to block the increase in tyrosine phosphorylation in human monocytes seen after stimulation with strong contact sensitizers. Human peripheral blood mononuclear cells were stimulated with 5-chloro-2-methylisothiazolinone plus 2-methylisothiazolinone in the presence or absence of these antioxidants. The total amount of membrane-associated phosphotyrosine in CD14+ cells was quantifi…

Antigen-Presenting CellsDermatologyPicryl ChlorideDermatitis ContactBiochemistryAntioxidantschemistry.chemical_compoundPyrrolidine dithiocarbamateHumansdendritic cellsCysteineSulfhydryl CompoundsTyrosinePhosphorylationAntigen-presenting cellMolecular BiologyCells CulturedNF-kappa BTyrosine phosphorylationCell BiologyGlutathioneAscorbic acidGlutathioneAcetylcysteineMAP kinaseschemistryBiochemistrycontact sensitizerthiol antioxidantTyrosineSignal transductionMitogen-Activated Protein KinasesmonocytesCysteineThe Journal of investigative dermatology
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Deciphering of ADP-induced, phosphotyrosine-dependent signaling networks in human platelets by Src-homology 2 region (SH2)-profiling.

2012

Tyrosine phosphorylation plays a central role in signal transduction controlling many important biological processes. In platelets, the activity of several signaling proteins is controlled by tyrosine phosphorylation ensuring proper platelet activation and aggregation essential for regulation of the delicate balance between bleeding and hemostasis. Here, we applied Src-homology 2 region (SH2)-profiling for deciphering of the phosphotyrosine state of human platelets activated by adenosine diphosphate (ADP). Applying a panel of 31 SH2-domains, rapid and complex regulation of the phosphotyrosine state of platelets was observed after ADP stimulation. Specific inhibition of platelet P2Y receptor…

Blood PlateletsProtein tyrosine phosphataseSH2 domainBiochemistryReceptor tyrosine kinasePhosphorylation cascadesrc Homology Domainschemistry.chemical_compoundReceptors Purinergic P2Y1Tandem Mass SpectrometryHumansProtease-activated receptorProtein phosphorylationIloprostPhosphorylationPhosphotyrosineMolecular BiologybiologyTyrosine phosphorylationPlatelet ActivationCyclic AMP-Dependent Protein KinasesAdenosine MonophosphateReceptors Purinergic P2Y12Cell biologyAdenosine DiphosphateEnzyme ActivationBiochemistrychemistrybiology.proteinPurinergic P2Y Receptor AntagonistsPhosphorylationProtein Processing Post-TranslationalSignal TransductionProteomics
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In BCR-ABL-positive cells, STAT-5 tyrosine-phosphorylation integrates signals induced by imatinib mesylate and Ara-C.

2003

In BCR-ABL-positive cells, the transcription factor STAT-5 is constitutively activated by tyrosine phosphorylation. STAT-5 activation results in upregulation of bcl-X(L) and increased resistance to induction of apoptosis. Here, we investigated the effects of imatinib mesylate and cytosine arabinoside (Ara-C) on STAT-5 tyrosine-phosphorylation, cellular proliferation and induction of apoptosis in cell lines and primary hematopoietic cells. Imatinib mesylate treatment strongly suppressed STAT-5 tyrosine-phosphorylation in K562 and primary CML blasts. In contrast to JAK-2 and PI-3-kinase inhibition, exposure of K562 cells to imatinib mesylate resulted in obvious suppression of proliferation. R…

Cancer ResearchProgrammed cell deathBlotting WesternFusion Proteins bcr-ablDown-RegulationAntineoplastic AgentsApoptosisBiologyPiperazineschemistry.chemical_compoundDownregulation and upregulationhemic and lymphatic diseasesLeukemia Myelogenous Chronic BCR-ABL PositivemedicineIn Situ Nick-End LabelingSTAT5 Transcription FactorHumansEnzyme InhibitorsPhosphorylationCell growthCytarabineImatinibTyrosine phosphorylationDrug SynergismHematologyDNAU937 CellsProtein-Tyrosine KinasesMilk ProteinsPrecipitin TestsDNA-Binding ProteinsImatinib mesylatePyrimidinesOncologychemistryApoptosisCaspasesBenzamidesCancer researchImatinib MesylateTrans-ActivatorsTyrosinePoly(ADP-ribose) PolymerasesK562 CellsCell Divisionmedicine.drugK562 cellsSignal TransductionLeukemia
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The role of signal transducers and activators of transcription in T inflammatory bowel diseases.

2003

Signal transducers and activators of transcription (STAT) proteins are intracellular effector molecules of cytokine-modulated signaling. On the one hand, they play an important role in hematopoiesis and the development of the human immune system. STAT transcription factors are necessary for embryogenesis and the maintenance of the mammalian immune response. In the adult, STAT signaling is responsible for T-cell polarization toward interferon gamma-secreting Th1 T cells or interleukin 4-producing Th2 cells. On the other hand, these proteins are involved in the regulation of T-cell survival. STAT activation is strongly associated with tyrosine phosphorylation by tyrosine kinases, namely Jak1,…

Cell SurvivalT-LymphocytesGastroenterologyTyrosine phosphorylationBiologyInflammatory Bowel DiseasesstatCell biologyHematopoiesischemistry.chemical_compoundchemistryInterferonImmunologySTAT proteinmedicineTrans-ActivatorsImmunology and AllergyHumansProtein inhibitor of activated STATSignal transductionSTAT4STAT6medicine.drugSignal TransductionInflammatory bowel diseases
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Activation and translocation of p38 mitogen-activated protein kinase after stimulation of monocytes with contact sensitizers.

2002

Recently we described the induction of tyrosine phosphorylation by contact sensitizers as an early molecular event during the activation of antigen- presenting cells. In this study, the role of the p38 mitogen-activated protein kinase for the activation of human monocytes after exposure to four structurally unrelated contact sensitizers was analyzed in comparison with the irritant benzalkonium chloride and an inductor of oxidative stress (H 2 O 2 ) using immunofluorescence, Western blotting, and enzyme-linked immunosorbent assay techniques. Bio chemical analysis revealed a translocation of p38 from the cytoplasm to the detergent-resistant cell fraction only upon stimulation with contact sen…

CytoplasmMAP Kinase Signaling SystemPyridinesp38 mitogen-activated protein kinasesDermatologyBiologyIn Vitro TechniquesBiochemistryp38 Mitogen-Activated Protein KinasesMonocyteschemistry.chemical_compoundProto-Oncogene ProteinsHumansEnzyme InhibitorsPhosphorylationProtein kinase ATranscription factorMolecular Biologyets-Domain Protein Elk-1KinaseImidazolesTyrosine phosphorylationBiological TransportCell BiologyMolecular biologyDNA-Binding ProteinsEnzyme ActivationIL-1β/irritantchemistryhaptenMitogen-activated protein kinasebiology.proteinIrritantsPhosphorylationSignal transductionMitogen-Activated Protein KinasesBenzalkonium CompoundsHaptenssignal transductionInterleukin-1Transcription FactorsThe Journal of investigative dermatology
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Oxidative stress inhibits IFN-α-induced antiviral gene expression by blocking the JAK–STAT pathway

2006

Abstract BACKGROUND/AIMS: Unresponsiveness to IFN-alpha is common in chronic hepatitis C. Since conditions associated with an increased oxidative stress (advanced age, steatosis, fibrosis, iron overload, and alcohol consumption) reduce the likelihood of response, we hypothesized that oxidative stress may affect the antiviral actions of IFN-alpha. METHODS: We examined in a human hepatocellular carcinoma cell line (Huh-7) the effect of hydrogen peroxide (H2O2), as a generator of oxidative stress, on the IFN-alpha signaling pathway. RESULTS: Pretreatment of Huh-7 cells with 0.5-1 mM H2O2 resulted in the suppression of the IFN-alpha-induced antiviral protein MxA and of IRF-9 mRNA expression. Th…

Gene Expression Regulation ViralMyxovirus Resistance ProteinsCarcinoma HepatocellularBlotting WesternAntiviral proteinProtein tyrosine phosphataseInterferon alpha-2Biologymedicine.disease_causechemistry.chemical_compoundGTP-Binding ProteinsCell Line TumormedicineHumansRNA NeoplasmHepatologyTyk-2Reverse Transcriptase Polymerase Chain ReactionSTATLiver NeoplasmsInterferon-alphaJAK-STAT signaling pathwayTyrosine phosphorylationHydrogen PeroxideJanus Kinase 1Flow CytometryInterferon-Stimulated Gene Factor 3 gamma SubunitRecombinant ProteinsIFN-aJAK-1Oxidative StressSTAT Transcription FactorsHydrogen peroxide; IFN-a; STAT; JAK-1; Tyk-2chemistryImmunologySTAT proteinCancer researchSignal transductionTyrosine kinaseOxidative stressSignal TransductionJournal of Hepatology
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β1-Integrin Cytoplasmic Subdomains Involved in Dominant Negative Function

1998

The beta1-integrin cytoplasmic domain consists of a membrane proximal subdomain common to the four known isoforms ("common" region) and a distal subdomain specific for each isoform ("variable" region). To investigate in detail the role of these subdomains in integrin-dependent cellular functions, we used beta1A and beta1B isoforms as well as four mutants lacking the entire cytoplasmic domain (beta1TR), the variable region (beta1COM), or the common region (beta1 deltaCOM-B and beta1 deltaCOM-A). By expressing these constructs in Chinese hamster ovary and beta1 integrin-deficient GD25 cells (Wennerberg et al., J Cell Biol 132, 227-238, 1996), we show that beta1B, beta1COM, beta1 deltaCOM-B, a…

Gene isoformTalinCytoplasmProtein ConformationIntegrinMolecular Sequence DataCHO CellsIntegrin alpha5Platelet Membrane GlycoproteinsArticleFocal adhesionchemistry.chemical_compoundMiceAntigens CDCricetinaeCell AdhesionAnimalsActininAmino Acid SequencePhosphorylationCell adhesionMolecular BiologyBinding SitesbiologyCell adhesion moleculeChinese hamster ovary cellIntegrin beta1Integrin beta3Tyrosine phosphorylationCell BiologyIntegrin alphaVProtein-Tyrosine KinasesRecombinant ProteinsCell biologyFibronectinsFibronectinchemistryFocal Adhesion Kinase 1Focal Adhesion Protein-Tyrosine KinasesMutationbiology.proteinCell Adhesion MoleculesSignal Transduction
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