title: Ex-vivo iTreg differentiation revisited: Convenient alternatives to existing strategies.
abstract: Ex-vivo differentiation of regulatory T cells (Tregs) from naïve CD4+T-cells has been widely used in immunological research. Isolation of a highly pure naïve T cell population is the key factor that determines the efficiency of subsequent Treg differentiation. Currently, this step relies mostly on FACS sorting, which is often costly, time consuming, and inconvenient. Alternatively, magnetic separation of T-cells can be performed; yet, available protocols fail to reach sort level purity and consequently result in low Treg differentiation efficiency. Here, we present the results of a comprehensive side-by-side comparison of various magnetic separation strategies and FACS sorting in multiple levels. Additionally, we propose a novel optimized custom made magnetic separation protocol, which not only yields sort level purity and Treg differentiation but also lowers the reagent costs up to 75% compared to the commercially available purification kits. The highly pure naïve CD4+T-cell population obtained by this versatile method can also be used for differentiation of other T-cell subsets; therefore this protocol may have broad applications in T-cell research.
authors.affiliation: Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, United States.
authors.forename: Billur
authors.initials: B
authors.lastname: Akkaya
authors.affiliation: Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, United States.
authors.forename: Amanda H
authors.initials: AH
authors.lastname: Holstein
authors.affiliation: Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, United States.
authors.forename: Christopher
authors.initials: C
authors.lastname: Isaac
authors.affiliation: Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, United States.
authors.forename: Mitra P
authors.initials: MP
authors.lastname: Maz
authors.affiliation: Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, United States.
authors.forename: Deborah D
authors.initials: DD
authors.lastname: Glass
authors.affiliation: Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, United States.
authors.forename: Ethan M
authors.initials: EM
authors.lastname: Shevach
authors.affiliation: Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD 20852, United States. Electronic address: munir.akkaya@nih.gov.
authors.forename: Munir
authors.initials: M
authors.lastname: Akkaya
mesh_terms: D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D002454:Cell Differentiation; D002469:Cell Separation / Q000379:methods*; D005434:Flow Cytometry / Q000379:methods; D006801:Humans; D018189:Immunomagnetic Separation; D008213:Lymphocyte Activation; D016176:T-Lymphocyte Subsets / Q000276:immunology; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*
keywords: FACS sorting; Foxp3; Magnetic separation; Regulatory T cells; Suppression assay