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author:("mcafee, Alan")
1.  Structure-Dependent Inhibition of Bladder and Pancreatic Cancer Cell Growth by 2-Substituted Glycyrrhetinic and Ursolic Acid Derivatives 
Derivatives of oleanolic acid, ursolic acid and glycyrrhetinic acid substituted with electron withdrawing groups at the 2-position in the A-ring which also contains a 1-en-3-one structure are potent inhibitors of cancer cell growth. In this study, we have compared the effects of several 2-substituted analogs of triterpenoid acid methyl esters derived from ursolic and glycyrrhetinic acid on proliferation of KU7 and 253JB-V bladder and Panc-1 and Panc-28 pancreatic cancer cells. The results show that the 2-cyano and 2-trifluoromethyl derivatives were the most active compounds. The glycyrrhetinic acid derivatives with the rearranged C-ring containing the 9(11)-en-12-one structure were generally more active than the corresponding 12-en-11-one isomers. However, differences in growth inhibitory IC50 values were highly variable and dependent on the 2- substitutent (CN vs. CF3) and cancer cell context.
doi:10.1016/j.bmcl.2008.03.031
PMCID: PMC2408873  PMID: 18359628
glycyrrhetinate analogs; growth inhibition; bladder cancer; pancreatic cancer

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