Isotanshinone IIA
Isotanshinone IIA non-competitively inhibits protein tyrosine phosphatase 1B (PTP1B) activity with 50% inhibitory concentration values of 11.4±0.6 μM. PTP1B acts as a negative regulator of insulin signaling, and selective inhibition of PTP1B has served as a potential drug target for the treatment of type 2 diabetes.
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Providing storage is as stated on the product vial and the vial is kept tightly sealed, the product can be stored for up to
24 months(2-8C).
Wherever possible, you should prepare and use solutions on the same day. However, if you need to make up stock solutions in advance, we recommend that you store the solution as aliquots in tightly sealed vials at -20C. Generally, these will be useable for up to two weeks. Before use, and prior to opening the vial we recommend that you allow your product to equilibrate to room temperature for at least 1 hour.
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Biol Pharm Bull. 2005 Sep;28(9):1795-7.
PTP1B inhibitory effect of abietane diterpenes isolated from Salvia miltiorrhiza.[Pubmed:
16141564]
Protein tyrosine phosphatase 1B (PTP1B) acts as a negative regulator of insulin signaling, and selective inhibition of PTP1B has served as a potential drug target for the treatment of type 2 diabetes.
METHODS AND RESULTS:
In the course of screening for PTP1B inhibitory natural products, the MeOH extract of the dried root of Salvia miltiorrhiza BUNGE (Labiatae) was found to exhibit significant inhibitory effect. Bioassay-guided fractionation and purification afforded three related abietane-type diterpene metabolites 1-3. Compounds 1-3 were identified as Isotanshinone IIA (1), dihydroisotanshinone I (2), and isocryptotanshinone (3) mainly by analysis of NMR and MS data.
CONCLUSIONS:
Compounds 1-3 non-competitively inhibited PTP1B activity with 50% inhibitory concentration values of 11.4+/-0.6 microM, 22.4+/-0.6 microM and 56.1+/-6.3 microM, respectively.
