2. Academic Validation
  3. Sustained in vivo signaling by long-lived IL-2 induces prolonged increases of regulatory T cells

Sustained in vivo signaling by long-lived IL-2 induces prolonged increases of regulatory T cells

  • J Autoimmun. 2015 Jan;56:66-80. doi: 10.1016/j.jaut.2014.10.002.
Charles J M Bell 1,  Yongliang Sun 2,  Urszula M Nowak 3,  Jan Clark 4,  Sarah Howlett 5,  Marcin L Pekalski 6,  Xin Yang 7,  Oliver Ast 8,  Inja Waldhauer 9,  Anne Freimoser-Grundschober 10,  Ekkehard Moessner 11,  Pablo Umana 12,  Christian Klein 13,  Ralf J Hosse 14,  Linda S Wicker 15,  Laurence B Peterson 16
Affiliations

Affiliations

  • 1 JDRF/Wellcome Trust Diabetes and Inflammation Laboratory, Department of Medical Genetics, Cambridge Institute for Medical Research, NIHR Cambridge Biomedical Research Centre, University of Cambridge, Cambridge CB2 OXY, United Kingdom. Electronic address: [email protected].
  • 2 Former Roche Site of Pharmaceutical Research and Early Development, Discovery Inflammation, Nutley, NJ 07110, USA. Electronic address: [email protected].
  • 3 Former Roche Site of Pharmaceutical Research and Early Development, Discovery Inflammation, Nutley, NJ 07110, USA. Electronic address: [email protected].
  • 4 JDRF/Wellcome Trust Diabetes and Inflammation Laboratory, Department of Medical Genetics, Cambridge Institute for Medical Research, NIHR Cambridge Biomedical Research Centre, University of Cambridge, Cambridge CB2 OXY, United Kingdom. Electronic address: [email protected].
  • 5 JDRF/Wellcome Trust Diabetes and Inflammation Laboratory, Department of Medical Genetics, Cambridge Institute for Medical Research, NIHR Cambridge Biomedical Research Centre, University of Cambridge, Cambridge CB2 OXY, United Kingdom. Electronic address: [email protected].
  • 6 JDRF/Wellcome Trust Diabetes and Inflammation Laboratory, Department of Medical Genetics, Cambridge Institute for Medical Research, NIHR Cambridge Biomedical Research Centre, University of Cambridge, Cambridge CB2 OXY, United Kingdom. Electronic address: [email protected].
  • 7 JDRF/Wellcome Trust Diabetes and Inflammation Laboratory, Department of Medical Genetics, Cambridge Institute for Medical Research, NIHR Cambridge Biomedical Research Centre, University of Cambridge, Cambridge CB2 OXY, United Kingdom. Electronic address: [email protected].
  • 8 Roche Pharmaceutical Research and Early Development, Large Molecule Research, Roche Innovation Center Zurich, Wagistrasse 18, CH-8952 Schlieren, Switzerland. Electronic address: [email protected].
  • 9 Roche Pharmaceutical Research and Early Development, Oncology Discovery & Translational Area, Roche Innovation Center Zurich, Wagistrasse 18, CH-8952 Schlieren, Switzerland. Electronic address: [email protected].
  • 10 Roche Pharmaceutical Research and Early Development, Large Molecule Research, Roche Innovation Center Zurich, Wagistrasse 18, CH-8952 Schlieren, Switzerland. Electronic address: [email protected].
  • 11 Roche Pharmaceutical Research and Early Development, Large Molecule Research, Roche Innovation Center Zurich, Wagistrasse 18, CH-8952 Schlieren, Switzerland. Electronic address: [email protected].
  • 12 Roche Pharmaceutical Research and Early Development, Oncology Discovery & Translational Area, Roche Innovation Center Zurich, Wagistrasse 18, CH-8952 Schlieren, Switzerland. Electronic address: [email protected].
  • 13 Roche Pharmaceutical Research and Early Development, Oncology Discovery & Translational Area, Roche Innovation Center Zurich, Wagistrasse 18, CH-8952 Schlieren, Switzerland. Electronic address: [email protected].
  • 14 Roche Pharmaceutical Research and Early Development, Large Molecule Research, Roche Innovation Center Zurich, Wagistrasse 18, CH-8952 Schlieren, Switzerland. Electronic address: [email protected].
  • 15 JDRF/Wellcome Trust Diabetes and Inflammation Laboratory, Department of Medical Genetics, Cambridge Institute for Medical Research, NIHR Cambridge Biomedical Research Centre, University of Cambridge, Cambridge CB2 OXY, United Kingdom. Electronic address: [email protected].
  • 16 JDRF/Wellcome Trust Diabetes and Inflammation Laboratory, Department of Medical Genetics, Cambridge Institute for Medical Research, NIHR Cambridge Biomedical Research Centre, University of Cambridge, Cambridge CB2 OXY, United Kingdom; Former Roche Site of Pharmaceutical Research and Early Development, Discovery Inflammation, Nutley, NJ 07110, USA. Electronic address: [email protected].
PMID: 25457307 DOI: 10.1016/j.jaut.2014.10.002
Abstract

Regulatory T cells (Tregs) expressing FOXP3 are essential for the maintenance of self-tolerance and are deficient in many common autoimmune diseases. Immune tolerance is maintained in part by IL-2 and deficiencies in the IL-2 pathway cause reduced Treg function and an increased risk of autoimmunity. Recent studies expanding Tregs in vivo with low-dose IL-2 achieved major clinical successes highlighting the potential to optimize this pleiotropic cytokine for inflammatory and autoimmune disease indications. Here we compare the clinically approved IL-2 molecule, Proleukin, with two engineered IL-2 molecules with long half-lives owing to their fusion in monovalent and bivalent stoichiometry to a non-FcRγ binding human IgG1. Using nonhuman primates, we demonstrate that single ultra-low doses of IL-2 fusion proteins induce a prolonged state of in vivo activation that increases Tregs for an extended period of time similar to multiple-dose Proleukin. One of the common pleiotropic effects of high dose IL-2 treatment, eosinophilia, is eliminated at doses of the IL-2 fusion proteins that greatly expand Tregs. The long half-lives of the IL-2 fusion proteins facilitated a detailed characterization of an IL-2 dose response driving Treg expansion that correlates with increasingly sustained, suprathreshold pSTAT5a induction and subsequent sustained increases in the expression of CD25, FOXP3 and Ki-67 with retention of Treg-specific epigenetic signatures at FOXP3 and CTLA4.

Keywords

Autoimmunity; Cytokine therapy; Graft versus host disease; IL-2 fusion proteins; Regulatory T cells.

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