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Asby DJ, Radigois MG, Wilson DC, Cuda F, Chai CLL, Chen A, Bienemann AS, Light ME, Harrowven DC, Tavassoli A. Triggering apoptosis in cancer cells with an analogue of cribrostatin 6 that elevates intracellular ROS. Org Biomol Chem 2018; 14:9322-9330. [PMID: 27722456 DOI: 10.1039/c6ob01591c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Elevation of reactive oxygen species (ROS) is both a consequence and driver of the upregulated metabolism and proliferation of transformed cells. The resulting increase in oxidative stress is postulated to saturate the cellular antioxidant machinery, leaving cancer cells susceptible to agents that further elevate their intracellular oxidative stress. Several small molecules, including the marine natural product cribrostatin 6, have been demonstrated to trigger apoptosis in cancer cells by increasing intracellular ROS. Here, we report the modular synthesis of a series of cribrostatin 6 derivatives, and assessment of their activity in a number of cell lines. We establish that placing a phenyl ring on carbon 8 of cribrostatin 6 leads to increased potency, and observe a window of selectivity towards cancer cells. The mechanism of activity of this more potent analogue is assessed and demonstrated to induce apoptosis in cancer cells by increasing ROS. Our results demonstrate the potential for targeting tumors with molecules that enhance intracellular oxidative stress.
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Affiliation(s)
- D J Asby
- Chemistry, University of Southampton, Southampton, SO17 1BJ, UK.
| | - M G Radigois
- Chemistry, University of Southampton, Southampton, SO17 1BJ, UK. and Institute of Chemical and Engineering Sciences, A*Star, 138665, Singapore
| | - D C Wilson
- Chemistry, University of Southampton, Southampton, SO17 1BJ, UK.
| | - F Cuda
- Chemistry, University of Southampton, Southampton, SO17 1BJ, UK.
| | - C L L Chai
- Institute of Chemical and Engineering Sciences, A*Star, 138665, Singapore and Department of Pharmacy, National University of Singapore, 117543, Singapore
| | - A Chen
- Institute of Chemical and Engineering Sciences, A*Star, 138665, Singapore
| | - A S Bienemann
- School of Clinical Sciences, University of Bristol, Southmead Hospital, Bristol, BS10 5NB, UK
| | - M E Light
- Chemistry, University of Southampton, Southampton, SO17 1BJ, UK.
| | - D C Harrowven
- Chemistry, University of Southampton, Southampton, SO17 1BJ, UK.
| | - A Tavassoli
- Chemistry, University of Southampton, Southampton, SO17 1BJ, UK. and The Institute for Life Sciences, University of Southampton, Southampton, UK
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