Designing and testing of novel taxanes to probe the highly complex mechanisms by which taxanes bind to microtubules and cause cytotoxicity to cancer cells

Marc St. George, Ahmed T. Ayoub, Asok Banerjee, Cassandra D.M. Churchill, Philip Winter, Mariusz Klobukowski, Carol E. Cass, Richard F. Ludueña, Jack A. Tuszynski, Sambasivarao Damaraju

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Our previous work identified an intermediate binding site for taxanes in the microtubule nanopore. The goal of this study was to test derivatives of paclitaxel designed to bind to this intermediate site differentially depending on the isotype of β-tubulin. Since β-tubulin isotypes have tissue-dependent expression - specifically, the βIII isotype is very abundant in aggressive tumors and much less common in normal tissues - this is expected to lead to tubulin targeted drugs that are more efficacious and have less side effects. Seven derivatives of paclitaxel were designed and four of these were amenable for synthesis in sufficient purity and yield for further testing in breast cancer model cell lines. None of the derivatives studied were superior to currently used taxanes, however computer simulations provided insights into the activity of the derivatives. Our results suggest that neither binding to the intermediate binding site nor the final binding site is sufficient to explain the activities of the derivative taxanes studied. These findings highlight the need to iteratively improve on the design of taxanes based on their activity in model systems. Knowledge gained on the ability of the engineered drugs to bind to targets and bring about activity in a predictable manner is a step towards personalizing therapies.

Original languageEnglish (US)
Article numbere0129168
JournalPloS one
Volume10
Issue number6
DOIs
StatePublished - Jun 8 2015

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)
  • General

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    St. George, M., Ayoub, A. T., Banerjee, A., Churchill, C. D. M., Winter, P., Klobukowski, M., Cass, C. E., Ludueña, R. F., Tuszynski, J. A., & Damaraju, S. (2015). Designing and testing of novel taxanes to probe the highly complex mechanisms by which taxanes bind to microtubules and cause cytotoxicity to cancer cells. PloS one, 10(6), [e0129168]. https://doi.org/10.1371/journal.pone.0129168