Search results for "Dual-specificity phosphatase"

showing 4 items of 4 documents

IL4 Primes the Dynamics of Breast Cancer Progression via DUSP4 Inhibition

2017

Abstract The tumor microenvironment supplies proinflammatory cytokines favoring a permissive milieu for cancer cell growth and invasive behavior. Here we show how breast cancer progression is facilitated by IL4 secreted by adipose tissue and estrogen receptor–positive and triple-negative breast cancer cell types. Blocking autocrine and paracrine IL4 signaling with the IL4Rα antagonist IL4DM compromised breast cancer cell proliferation, invasion, and tumor growth by downregulating MAPK pathway activity. IL4DM reduced numbers of CD44+/CD24− cancer stem-like cells and elevated expression of the dual specificity phosphatase DUSP4 by inhibiting NF-κB. Enforced expression of DUSP4 drove conversio…

0301 basic medicineCancer ResearchBlotting WesternCA 15-3Breast Neoplasms03 medical and health sciencesParacrine signalling0302 clinical medicineBreast cancerCell Line TumorTumor MicroenvironmentmedicineHumansskin and connective tissue diseasesAutocrine signallingDual-Specificity PhosphataseBlotting Western; Breast Neoplasms; Cell Line Tumor; Disease Progression; Dual-Specificity Phosphatases; Female; Flow Cytometry; Heterografts; Humans; Interleukin-4; Mitogen-Activated Protein Kinase Phosphatases; Tumor Microenvironment; Oncology; Cancer ResearchTumor microenvironmentbiologyCD44CancerFlow Cytometrymedicine.disease030104 developmental biologyOncology030220 oncology & carcinogenesisImmunologyCancer cellDisease Progressionbiology.proteinCancer researchDual-Specificity PhosphatasesHeterograftsMitogen-Activated Protein Kinase PhosphatasesFemaleInterleukin-4HeterograftMitogen-Activated Protein Kinase PhosphataseBreast NeoplasmHumanCancer Research
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Assessing the biological activity of the glucan phosphatase laforin

2016

Glucan phosphatases are a recently discovered family of enzymes that dephosphorylate either starch or glycogen and are essential for proper starch metabolism in plants and glycogen metabolism in humans. Mutations in the gene encoding the only human glucan phosphatase, laforin, result in the fatal, neurodegenerative, epilepsy known as Lafora disease. Here, we describe phosphatase assays to assess both generic laforin phosphatase activity and laforin's unique glycogen phosphatase activity.

0301 basic medicinePhosphataseLafora diseaseArticleSubstrate SpecificityNitrophenols03 medical and health scienceschemistry.chemical_compound0302 clinical medicineOrganophosphorus CompoundsDual-specificity phosphatasemedicineHumansGlucanEnzyme Assayschemistry.chemical_classificationGlycogenbiologyfood and beveragesBiological activitymedicine.diseaseFluoresceinsProtein Tyrosine Phosphatases Non-Receptor030104 developmental biologyEnzymechemistryBiochemistryLafora Diseasebiology.proteinLaforin030217 neurology & neurosurgeryGlycogen
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Role of Redox Signaling, Protein Phosphatases and Histone Acetylation in the Inflammatory Cascade in Acute Pancreatitis: Therapeutic Implications

2010

Acute pancreatitis starts as a local inflammation of the pancreatic tissue but often leads to the systemic inflammatory response syndrome and death by multiple organ failure. Pro-inflammatory cytokines, particularly TNF-alpha and Il-1beta, play a pivotal role together with oxidative stress and glutathione depletion in the inflammatory response in this disease. Most inflammatory mediators act through mitogen activated protein kinases and nuclear factor kB. Nevertheless, elucidation of the precise mechanisms involved in activation and attenuation phases of the inflammatory cascade is still underway. Redox signaling mediated by inactivation of protein phosphatases and histone acetylation trigg…

Phosphodiesterase InhibitorsImmunologyPhosphataseBiologyHistonesDual-specificity phosphatasePhosphoprotein PhosphatasesHumansImmunology and AllergyPancreasHistone AcetyltransferasesInflammationPharmacologyHistone AcetyltransferasesKinaseAcetylationGeneral MedicineProtein phosphatase 2ChromatinCell biologyHistone Deacetylase InhibitorsHistonePancreatitisBiochemistryAcetylationAcute Diseasebiology.proteinSignal transductionOxidation-ReductionSignal TransductionInflammation & Allergy - Drug Targets
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Dual specificity phosphatase 1 knockout mice show enhanced susceptibility to anaphylaxis but are sensitive to glucocorticoids.

2007

Dual specificity phosphatase DUSP1 (otherwise known as mitogen-activated phosphatase 1 or MKP-1) dephosphorylates MAPKs, particularly p38, and negatively regulates innate immunity. Recent studies have shown that the DUSP1 gene is transcriptionally up-regulated by glucocorticoids (GCs) and that the antiinflammatory action of GCs is impaired in DUSP1-/- mice. Here we show that GC-mediated dephosphorylation of ERK-1 and ERK-2 activated by IgE receptor cross-linking is unimpaired in bone marrow-derived mast cells (BMMCs) of DUSP1-/- mice. Dephosphorylation of phospho-p38 MAPK is impaired but only at early times of GC treatment. Proinflammatory cytokine and chemokine gene expression (CCL2, IL-6,…

medicine.medical_specialtyChemokinePhosphataseImmunoglobulin Ep38 Mitogen-Activated Protein KinasesProinflammatory cytokineDephosphorylationMiceEndocrinologyInternal medicineSepsisDual-specificity phosphatasemedicineAnimalsGenetic Predisposition to DiseaseMolecular BiologyAnaphylaxisGlucocorticoidsMice KnockoutMitogen-Activated Protein Kinase 1Mice Inbred C3HMitogen-Activated Protein Kinase 3biologyInterleukin-6Tumor Necrosis Factor-alphaDegranulationDual Specificity Phosphatase 1General MedicineMice Inbred C57BLEndocrinologyGene Expression RegulationMice Inbred DBAbiology.proteinCytokinesTumor necrosis factor alphaMolecular endocrinology (Baltimore, Md.)
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