6533b7d0fe1ef96bd125b9c2

RESEARCH PRODUCT

Endothelial Nitric Oxide Synthase Regulates T Cell Receptor Signaling at the Immunological Synapse

Juan M. SerradorFrancisco Sánchez-madridAna UrzainquiIrene BoscaVictor M. VictorJuan V. EspluguesAngel OrtegaSales IbizaJosé E. O’connor

subject

Interleukin 2CD3 ComplexNitric Oxide Synthase Type IIIT-LymphocytesImmunologyReceptors Antigen T-CellAntigen-Presenting CellsGolgi ApparatusBiologyLymphocyte ActivationNitric OxideNitric oxideImmunological synapseInterferon-gammaMicePhosphatidylinositol 3-Kinaseschemistry.chemical_compoundAntigenmedicineAnimalsHumansImmunology and AllergyCytotoxic T cellAntigensMOLIMMUNOAntigen-presenting cellNitric Oxide Synthase Type IIIMice Mutant StrainsCell biologyInfectious DiseaseschemistryInterleukin-2CalciumSignal transductionSignal Transductionmedicine.drug

description

The role of nitric oxide (NO) in T cells remains controversial, and the origin and localization of endogenous NO and whether it regulates lymphocyte activation are unclear. We show here that, within minutes of binding to antigen, T cells produce NO via endothelial nitric oxide synthase (eNOS). This process required increased intracellular Ca2+ and phosphoinositide3-kinase activity. By using an eNOS-green fluorescent fusion protein and fluorescent probes to detect NO, we show that eNOS translocates with the Golgi apparatus to the immune synapse of T helper cells engaged with antigen-presenting cells (APC), where it was fully activated. Overexpression of eNOS prevented the central coalescence of CD3 at the T cell-APC contact site, which was accompanied by increased phosphorylation of CD3zeta chain, ZAP-70, and extracellular signal-regulated kinases and increased IFN-gamma synthesis, but reduced production of IL-2. Therefore, eNOS-derived NO selectively potentiates T cell receptor signaling to antigen at the immunological synapse.

yearjournalcountryeditionlanguage
2006-06-01Immunity
https://doi.org/10.1016/j.immuni.2006.04.006