0000000000264172

AUTHOR

Sonia Merluzzi

showing 2 related works from this author

Mast cells enhance proliferation of B lymphocytes and drive their differentiation toward IgA-secreting plasma cells.

2010

AbstractThe evidence of a tight spatial interaction between mast cells (MCs) and B lymphocytes in secondary lymphoid organs, along with the data regarding the abundance of MCs in several B-cell lymphoproliferative disorders prompted us to investigate whether MCs could affect the proliferation and differentiation of B cells. To this aim, we performed coculture assays using mouse splenic B cells and bone marrow–derived MCs. Both nonsensitized and activated MCs proved able to induce a significant inhibition of cell death and an increase in proliferation of naive B cells. Such proliferation was further enhanced in activated B cells. This effect relied on cell-cell contact and MC-derived interle…

Immunoglobulin AMAST CELL B LYMPHOCITESCellular differentiationImmunologyNaive B cellCD40 LigandPlasma CellsCell CommunicationImmunoglobulin ELymphocyte ActivationBiochemistryMast cellMiceImmune systemIg isotype switchmedicineAnimalsHumansMast CellsCD40 AntigensCell ProliferationIG-A.B cellB cellsMast cell; B cells; Differentiation; Ig isotype switchCD40biologyCell DeathInterleukin-6Cell DifferentiationCell BiologyHematologyMast cellhumanitiesCell biologyImmunity HumoralImmunoglobulin Amedicine.anatomical_structureGene Expression RegulationDifferentiationImmunologybiology.proteinMAST CELL B LYMPHOCITES; IG-A.Syndecan-1AntibodyBlood
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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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