Spleens were dissected from mouse spleen using
70µm cell strainers (Falcon) and further processed under sterile conditions. Single-cell suspensions were rinsed-out with
RPMI-1640 (Lonza) supplemented with 10% (vol/vol) fetal calf serum (FCS), 2 mM L-glutamine, 1 mM sodium pyruvate, 0.1 mM non-essential amino acids, 40 mM β-mercaptoethanol, 100 U ml−1of penicillin, and 100 U ml−1of streptomycin (all reagents from Lonza).
CD4
+ cells were purified by negative selection with magnetic depletion of B cells, macrophages, DCs, NK cells, granulocytes and CD8
+ cells using a cocktail of biotinylated antibodies (
anti-CD49b, DX5, eBiosciences; anti-GR1, RB6-8C5, produced in house; anti-Ter119, BioXCell; anti-CD11c, N418, produced in house;
anti-CD19, BioXCell; anti-CD8β, H35, produced in house;
anti-CD25, PC61.5, eBiosciences (used for Tconv-but not Treg- purification);
anti-MHCII, M5/114.15.2, eBiosciences). Cells were recuperated after flow-through the magnetic column, with previous incubation with
anti-biotin Microbeads (Miltenyi Biotec). Untouched cells were stained to exclude dead cells and incubated with Fc receptor-blocking antibodies
CD16/32 (Fc block; BD Pharmingen) and surface staining antibody CD3
+ and CD4
+. Tconvs and Tregs were identified in FSC/SSC-low-to-moderate and sorted as GFP
- or GFP
+ respectively using a
BD FACSAria III.
Bowakim-Anta N., Acolty V., Azouz A., Yagita H., Leo O., Goriely S., Oldenhove G, & Moser M. (2023). Chronic CD27-CD70 costimulation promotes type 1-specific polarization of effector Tregs. Frontiers in Immunology, 14, 1023064.