Tanshinone I Tanshinone I, an active principle isolated from Salvia miltiorrhiza (Danshen), is structurally similar to tanshinone IIA and may possess similar cytotoxic effects on tumor cells. In vitro
Tanshinone I, an active principle isolated from Salvia miltiorrhiza (Danshen), is structurally similar to tanshinone IIA and may possess similar cytotoxic effects on tumor cells. Tanshinone I inhibits PGE2 formation from LPS-induced RAW macrophages (IC50 = 38 μM). However, this compound does not affect COX-2 activity or COX-2 expression. Tanshinone I is an inhibitor of type IIA human recombinant phospholipase A2 (PLA2) with IC50 of 11 μM. In preliminary data, tanshinone I possesses the strongest inhibitory effect on tumor necrosis factor-α (TNF-α)-induced adhesion molecules.