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  • Oral presentation
  • Open Access

Large scale in vitro expansion of polyclonal human CD4+CD25high regulatory T cells

  • 1Email author,
  • 1,
  • 2,
  • 1 and
  • 1
Cancer Cell International20044 (Suppl 1) :S11

  • Received: 28 April 2004
  • Published:


  • Bone Marrow Transplantation
  • Treg Cell
  • Solid Organ
  • Adoptive Transfer
  • Suppressive Activity

CD4+CD25+ regulatory T (Treg) cells are pivotal for the maintenance of self-tolerance and their adoptive transfer protects from autoimmune diseases and pathogenic alloresponses after solid organ or bone marrow transplantation in murine model systems. In vitro, human CD4+CD25+ Treg cells display similar phenotypic and functional characteristics as murine CD4+CD25+ Treg cells, namely hyporesponsiveness to TCR stimulation and suppression of CD25- T cells. Thus far, the detailed characterization and potential clinical application of human CD4+CD25+ Treg cells was hampered by their paucity in peripheral blood and the lack of appropriate expansion protocols. Here we describe the up to 40,000-fold expansion of highly purified human CD4+CD25high T cells in vitro through the use of artificial APC for repeated stimulation via CD3 and CD28 in the presence of high dose IL-2. Expanded CD4+CD25high T cells were polyclonal, maintained their phenotype, exceeded the suppressive activity of freshly isolated CD4+CD25high T cells and showed characteristics of central memory T cells. The ability to rapidly expand human CD4+CD25high Treg cells large scale will not only facilitate their further exploration but also accelerate their potential clinical application in T cell-mediated diseases and transplantation medicine.

Authors’ Affiliations

Department of Hematology & Oncology, University Hospital Regensburg, 93053 Regensburg, Germany
Institute of Pathology, University HospitalRegensburg, 93053 Regensburg, Germany


© Author(s); licensee BioMed Central Ltd. 2004