A triple parameter reporter T cell line was generated.
NF-κB, NFAT and AP-1 activity induces CFP, eGFP and mCherry, respectively.
All three reporters were activated upon triggering of the TCR–CD3 complex.
Costimulation via CD2 and CD28 enhanced NF-κB, NFAT and AP-1 reporter activity.
PD-1 and BTLA signals inhibited NF-κB, NFAT and AP-1.