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Description: Tanshinone I (Tanshinone A; dihydrotanshinone, tanshinone IIA), a natural pigment isolated from the herbal medicine Salvia miltiorrhiza Bunge, is a potent inhibitor of type IIA human recombinant sPLA2 with important biological activity. It inhibits type IIA human recombinant sPLA2 and rabbit recombinant cPLA2 with IC50s of 11 μM and 82 μM, respectively. It is an active component that may have anticancer, antidiabetic, and neuroprotective properties. Tanshinone I displays cytotoxicity against human macrophages and IFN-g production in KLH-primed lymph node cells. Tanshinone I inhibits PGE2 formation from LPS-induced RAW macrophages (IC50 = 38 μM).
References: Phytother Res. 2002 Nov;16(7):616-20; Carcinogenesis. 2008 Oct;29(10):1885-92.
Chemical Name: 1,6-dimethyl-phenanthro[1,2-b]furan-10,11-dione
InChi Key: AIGAZQPHXLWMOJ-UHFFFAOYSA-N
InChi Code: InChI=1S/C18H12O3/c1-9-4-3-5-12-11(9)6-7-13-15(12)17(20)16(19)14-10(2)8-21-18(13)14/h3-8H,1-2H3
SMILES Code: O=C(C1=C2C(C(C)=CC=C2)=CC=C1C3=C4C(C)=CO3)C4=O
dihydrotanshinone, tanshinone I, or tanshinone IIA
Mass (g) = Concentration (mol/L) × Volume (L) × Molecular Weight (g/mol)
Concentration (start) × Volume (start) = Concentration (final) × Volume (final)
This equation is commonly abbreviated as: C1V1 = C2V2
In vitro activity: 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.
Kinase Assay: As sources of PLA2, human recombinant sPLA2 (type IIA) is purified from CHO cells transfected with the PLA2 gene and rabbit recombinant platelet cPLA2 is obtained through its expression in baculovirus. The standard reaction mixture (200 μL) contained 100 mM Tris-HCl buffer (pH 9.0) with 6 mM CaCl2 and 20 nmol 1-acyl-[1-14C]-arachidonyl-sn-glycerophosphoethanolamine (2000 cpm/nmol) in the presence or absence of Tanshinone I. The reaction is started by adding 50 ng purified sPLA2 or cPLA2. After 20 min at 37°C, the free fatty acid generated is analysed. Under these standard conditions, the reaction mixture in the absence of Tanshinone I released approximately 10% of free fatty acid from the phospholipid substrate added.
Cell Assay: RAW 264.7 cells are cultured with DMEM supplemented with 10% FBS and 1% antibiotics under 5% CO2 at 37°C. Briefly, cells are plated in 96-well plates (2×105 cells/well). LPS (1 ug/mL) and Tanshinone I are simultaneously added and incubated for 24 h, unless otherwise specified. The PGE2 concentration in the medium is measured using an EIA kit for PGE2. In order to determine the effects of Tanshinone I on PGE2 production after induction of COX-2, cells are incubated with LPS (1 ug/mL) for 24 h and thoroughly washed. Then, Tanshinone I is added without LPS and the cells are incubated for another 24 h. From the medium, PGE2 concentrations are measured. The cytotoxicity of Tanshinone I to RAW cells is checked using the MTT assay. Tanshinone I does not show any cytotoxicity up to 100 uM.
Phytother Res. 2002 Nov;16(7):616-20; Carcinogenesis. 2008 Oct;29(10):1885-92.
Purity ≥98%
COA
MSDS