The cytokine interleukin IL‐35 is known to exert strong immunosuppressive functions. Indoleamine 2,3‐dioxygenase 1 (IDO1) and Arginase 1 (Arg1) are metabolic enzymes that, expressed by dendritic cells (DCs), contribute to immunoregulation. Here, we explored any possible link between IL‐35 and the activity of those enzymes. We transfected a single chain IL‐35Ig gene construct in murine splenic DCs (DC35) and assessed any IDO1 and Arg1 activities as resulting from ectopic IL‐35Ig expression, both in vitro and in vivo. Unlike Ido1, Arg1 expression was induced in vitro in DC35, and it conferred an immunosuppressive phenotype on those cells, as revealed by a delayed‐type hypersensitivity assay. Moreover, the in vivo onset of a tolerogenic phenotype in DC35 was associated with the detection of CD25+CD39+, rather than Foxp3+, regulatory T cells. Therefore, Arg1, but not Ido1, expression in DC35 appears to be an early event in IL‐35Ig–mediated immunosuppression.

IL‐35Ig–expressing dendritic cells induce tolerance via Arginase 1

Panfili, Eleonora;Giada Mondanelli;Ciriana Orabona;Roberta Bianchi;Marco Gargaro;Francesca Fallarino;Paolo Puccetti;Ursula Grohmann;Claudia Volpi
Funding Acquisition
;
Maria Laura Belladonna
Writing – Original Draft Preparation
2019

Abstract

The cytokine interleukin IL‐35 is known to exert strong immunosuppressive functions. Indoleamine 2,3‐dioxygenase 1 (IDO1) and Arginase 1 (Arg1) are metabolic enzymes that, expressed by dendritic cells (DCs), contribute to immunoregulation. Here, we explored any possible link between IL‐35 and the activity of those enzymes. We transfected a single chain IL‐35Ig gene construct in murine splenic DCs (DC35) and assessed any IDO1 and Arg1 activities as resulting from ectopic IL‐35Ig expression, both in vitro and in vivo. Unlike Ido1, Arg1 expression was induced in vitro in DC35, and it conferred an immunosuppressive phenotype on those cells, as revealed by a delayed‐type hypersensitivity assay. Moreover, the in vivo onset of a tolerogenic phenotype in DC35 was associated with the detection of CD25+CD39+, rather than Foxp3+, regulatory T cells. Therefore, Arg1, but not Ido1, expression in DC35 appears to be an early event in IL‐35Ig–mediated immunosuppression.
2019
File in questo prodotto:
File Dimensione Formato  
2019_IL‐35Ig–expressing dendritic cells_PDFeditoriale.pdf

accesso aperto

Descrizione: Articolo principale
Tipologia di allegato: PDF-editoriale
Licenza: Creative commons
Dimensione 318.36 kB
Formato Adobe PDF
318.36 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11391/1447757
Citazioni
  • ???jsp.display-item.citation.pmc??? 5
  • Scopus 8
  • ???jsp.display-item.citation.isi??? 9
social impact