Search results for "OX40L"

showing 2 items of 2 documents

CD4+CD25+ regulatory T cells suppress mast cell degranulation and allergic responses through OX40-OX40L interaction.

2008

T regulatory (Treg) cells play a role in the suppression of immune responses, thus serving to induce tolerance and control autoimmunity. Here, we explored whether Treg cells influence the immediate hypersensitivity response of mast cells (MCs). Treg cells directly inhibited the FcεRI-dependent MC degranulation through cell-cell contact involving OX40-OX40L interactions between Treg cells and MCs, respectively. When activated in the presence of Treg cells, MCs showed increased cyclic adenosine monophosphate (cAMP) concentrations and reduced Ca2+ influx, independently of phospholipase C (PLC)-γ2 or Ca2+ release from intracellular stores. Antagonism of cAMP in MCs reversed the inhibitory effec…

T-LymphocytesCELLIMMUNO; Animals; Calcium; Cell Line Tumor; Gene Knockdown Techniques; Histamine Release; Humans; Hypersensitivity; Mast Cells; Membrane Glycoproteins; Mice; Mice Inbred BALB C; Mice Inbred C57BL; Phospholipase C gamma; Receptors OX40; T-Lymphocytes Regulatory; Tumor Necrosis Factors; Cell Degranulation; Immunology and Allergy; Infectious Diseases; ImmunologyInbred C57BLmedicine.disease_causeHistamine ReleaseT-Lymphocytes RegulatoryCell DegranulationAutoimmunityMicechemistry.chemical_compoundReceptorsImmunology and AllergyOX40Mast CellsInbred BALB CMice Inbred BALB CTumorMembrane GlycoproteinsDegranulationhemic and immune systemsRegulatoryhumanitiesCell biologyTregInfectious DiseasesGene Knockdown TechniquesTumor Necrosis FactorsMembrane GlycoproteinMast cell; Treg; OX40-OX40L interactionIntracellularHumanCell DegranulationImmunologyInfectious Diseasechemical and pharmacologic phenomenaBiologybehavioral disciplines and activitiesArticleCell LineMast cellImmune systemCell Line TumorHypersensitivitymedicineAnimalsHumansCyclic adenosine monophosphatePhospholipase CAnimalPhospholipase C gammaReceptors OX40Mice Inbred C57BLchemistryCELLIMMUNOCell cultureGene Knockdown TechniqueImmunologyOX40-OX40L interactionCalciumTumor Necrosis Factor
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CD40 activity on mesenchymal cells negatively regulates OX40L to maintain bone marrow immune homeostasis under stress conditions

2021

BackgroundWithin the bone marrow (BM), mature T cells are maintained under homeostatic conditions to facilitate proper hematopoietic development. This homeostasis depends upon a peculiar elevated frequency of regulatory T cells (Tregs) and immune regulatory activities from BM-mesenchymal stem cells (BM-MSCs). In response to BM transplantation (BMT), the conditioning regimen exposes the BM to a dramatic induction of inflammatory cytokines and causes an unbalanced T-effector (Teff) and Treg ratio. This imbalance negatively impacts hematopoiesis, particularly in regard to B-cell lymphopoiesis that requires an intact cross-talk between BM-MSCs and Tregs. The mechanisms underlying the ability of…

mesenchymal cellAdultMaleCancer ResearchTransplantation ConditioningT cellbone marrow transplantationImmunologyBone Marrow CellsOX40 LigandBiologySettore MED/08 - Anatomia PatologicaLymphocyte ActivationMesenchymal Stem Cell TransplantationT-Lymphocytes RegulatoryMiceYoung AdultImmune systemBone MarrowStress PhysiologicalmedicineCD40AnimalsHomeostasisHumansImmunology and AllergyLymphopoiesisCD40 AntigensOriginal ResearchAgedCD40B-cell developmentMesenchymal Stem Cellshemic and immune systemsRC581-607Middle AgedOX40LCell biologyTransplantationHaematopoiesismedicine.anatomical_structureGene Expression Regulationbiology.proteinFemaleBone marrowImmunologic diseases. AllergyStem cellB-cell developmentbone marrow transplantation CD40 mesenchymal cell OX40L
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