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A systematic SAR study of C10 modified paclitaxel analogues using a combinatorial approach
Authors:Liu Yanbin  Ali Syed M  Boge Thomas C  Georg Gunda I  Victory Samuel  Zygmunt Jan  Marquez Rebecca T  Himes Richard H
Institution:Department of Medicinal Chemistry, and the Drug Discovery Program, Higuchi Biosciences Center, University of Kansas, Lawrence, KS 66045, USA.
Abstract:A library with 63 paclitaxel analogues modified at the C10 position of paclitaxel has been prepared using parallel solution phase synthesis. Most of the C10 analogues were slightly less active than paclitaxel in the tubulin assembly assay and had reduced potency in the B16 melanoma and MCF-7 cell line cytotoxicity assays. These modifications at C10, however, did not lead to the total loss of activity, indicating that the C10 moiety of paclitaxel may not be directly involved in the drug-microtubule interactions, but could influence its binding affinity to P-glycoprotein. Approximately 50% of the analogues demonstrated better activity against the drug resistant cell line MCF7-ADR. However, the increase in activity was 10-fold at most. This result demonstrates that the cytotoxicity against this drug resistant cancer cell line is sensitive to structural changes at the C10 position of paclitaxel. It was also found that the presence of a nitrogen atom in the C10 substituent might play a role in the interaction of analogues with microtubules.
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