6533b7cffe1ef96bd1258ede
RESEARCH PRODUCT
A non-redundant role for OX40 in the competitive fitness of Treg in response to IL-2.
Silvia PiconeseMario P. ColomboClaudio TripodoPaola PittoniAlessia BurocchiAlessandra CarèAndrea Gorzanellisubject
Malemedicine.medical_treatmentImmunologyBlotting Westernchemical and pharmacologic phenomenaEndogenyInflammationSuppressor of Cytokine Signaling ProteinsT-Lymphocytes RegulatoryMiceSuppressor of Cytokine Signaling 1 ProteinLymphopeniaOX40; Treg; IL-2.medicineSTAT5 Transcription FactorImmunology and AllergyAnimalsOX40PhosphorylationReceptorSTAT5Cell ProliferationMice KnockoutbiologyEffectorCell growthSuppressor of cytokine signaling 1hemic and immune systemsReceptors OX40IL-2.ColitisFlow Cytometrycytokinescompetitive fitnessSpecific Pathogen-Free OrganismsThymectomyMice Inbred C57BLTregRadiation ChimeraImmunologybiology.proteinInterleukin-2costimulatory moleculesmedicine.symptomcompetitive fitness; costimulatory molecules; cytokines; tregdescription
OX40 stimulation is known to enhance activation of effector T cells and to inhibit induction and suppressive function of Treg. Here we uncovered a novel role of OX40 in sustaining Treg competitive fitness in vivo, during repopulation of lymphopenic hosts and reconstitution of BM chimeras. Defective expansion of OX40-null Treg diminished their ability to suppress inflammation in a model of lymphopenia-driven colitis. OX40-mediated promotion of Treg fitness spanned beyond lymphopenic environments, as endogenous Treg in OX40-null mice showed decreased accumulation during thymic development, enhanced susceptibility to antibody-mediated depletion and defective turnover following thymectomy. In vitro, OX40-deficient Treg were found to be intrinsically hyporesponsive to IL-2, in terms of Stat5 phosphorylation and proliferation, according to elevated SOCS1 content and reduced miR155 expression. Therefore, OX40 is a key factor in shaping Treg sensitivity to IL-2 and promoting their proliferation and survival, toward accurate immune regulation.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-01-01 |