6533b85bfe1ef96bd12bad0b
RESEARCH PRODUCT
The matricellular protein SPARC supports follicular dendritic cell networking toward Th17 responses.
Caterina VitaliClaudia ChiodoniSabina SangalettiClaudio TripodoSilvia MusioMario P. ColomboSilvia PiconeseMassimo CostanzaAlfonso PassafaroVincenzo BarnabaRosetta PedottiAndrea GorzanelliPietro Luigi PolianiPaola PittoniAlessia Burocchisubject
Autoimmune diseases; Extracellular matrix; Germinal centre reaction; Th17 cellsEncephalomyelitis Autoimmune ExperimentalMultiple SclerosisImmunologyCell CommunicationBiologyfollicular dendritic cellExtracellular matrixAnimals Genetically ModifiedMiceImmune systemSPARC; follicular dendritic cell; Th17Autoimmune diseasemedicinegerminal centre reactionImmunology and AllergyAnimalsHumansautoimmune diseasesOsteonectinMice KnockoutB-LymphocytesCD40Follicular dendritic cellsExperimental autoimmune encephalomyelitisMatricellular proteinGerminal centerSPARCCell Differentiationmedicine.diseaseCell biologyExtracellular MatrixImmunity HumoralMice Inbred C57BLCrosstalk (biology)Disease Models AnimalImmunologybiology.proteinDisease ProgressionTh17 CellsImmunizationMyelin-Oligodendrocyte GlycoproteinTh17autoimmune diseases; extracellular matrix; germinal centre reaction; th17 cellsDendritic Cells FollicularMyelin Proteinsdescription
Abstract Lymphnode swelling during immune responses is a transient, finely regulated tissue rearrangement, accomplished with the participation of the extracellular matrix. Here we show that murine and human reactive lymph nodes express SPARC in the germinal centres. Defective follicular dendritic cell networking in SPARC-deficient mice is accompanied by a severe delay in the arrangement of germinal centres and development of humoral autoimmunity, events that are linked to Th17 development. SPARC is required for the optimal and rapid differentiation of Th17 cells, accordingly we show delayed development of experimental autoimmune encephalomyelitis whose pathogenesis involves Th17. Not only host radioresistant cells, namely follicular dendritic cells, but also CD4+ cells are the relevant sources of SPARC, in vivo. Th17 differentiation and germinal centre formation mutually depend on SPARC for a proper functional crosstalk. Indeed, Th17 cells can enter the germinal centres in SPARC-competent, but not SPARC-deficient, mice. In summary, SPARC optimizes the changes occurring in lymphoid extracellular matrix harboring complex interactions between follicular dendritic cells, B cells and Th17 cells.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2011-12-01 | Journal of autoimmunity |