Abstract Title:

Chemopreventive properties of phytosterols and maslinic acid extracted from Coleus tuberosus in inhibiting the expression of EBV early-antigen in Raji cells.

Abstract Source:

Chem Biodivers. 2010 May;7(5):1267-75. PMID: 20491082

Abstract Author(s):

Lim Yang Mooi, Norhanom Abdul Wahab, Nordin Haji Lajis, Abdul Manaf Ali

Article Affiliation:

Department of Science, Faculty of Engineering and Science, Universiti Tunku Abdul Rahman, Jalan Genting Kelang, Setapak, 53300 Kuala Lumpur, Malaysia. [email protected]


Bioassay-guided fractionation of a MeOH extract of tubers of Coleus tuberosus afforded the active anti-tumor-promoting compounds identified as the triterpenoid 2alpha,3beta-dihydroxyolean-12-en-28-oic acid (maslinic acid; CT2) and a phytosterol mixture (CT1). CT1 consists of stigmasterol (32%), beta-sitosterol (40.3%), and campesterol (27.7%) as determined by capillary gas chromatography. CT1 and CT2 showed very strong anti-tumor-promoting activities at IC(50) 0.7 microg/ml and 0.1 microg/ml, respectively, in a convenient, short-term in vitro assay, i.e., the inhibition of Epstein-Barr virus (EBV) activation induced by phorbol 12-myristate 13-acetate (PMA) and sodium butyrate. We report for the first time the anti-tumor-promoting activity of 2alpha,3beta-dihydroxyolean-12-en-28-oic acid and show that a mixture of stigmasterol, beta-sitosterol, and campesterol is more potent than the individual components in inhibiting tumor-promoting activity.

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