BALB/c splenic dendritic cells (DCs) were isolated by using the Pan
Dendritic Cell Isolation Kit (Miltenyi Biotec, San Diego, CA).
Irf4−/− CD4+ T cells
were activated for 3 days with BALB/c splenic DCs and 100 IU IL‐2
(PeproTech, Rocky Hill, NJ), and then transduced with IRF4‐GFP or
GFP‐Ctrl retrovirus as previously described.8 (link) Cells were cultured for 1 day after
transduction, and then adoptively transferred into Irf4fl/flCd4‐Cre mice on day 1 post‐heart
transplantation.