Immunosuppressant PG490 (triptolide) inhibits T-cell interleukin-2 expression at the level of purine-box/nuclear factor of activated T-cells and NF-κB transcriptional activation. - Qiu ,D.M,.; Zhao ,G.H,.; Aoki ,Y,.; Shi ,L.F,.; Uyei ,A,.; Nazarian ,S.. (J. Biol. Chem., 1999)