Mitochondrial targeting of α-tocopheryl succinate enhances its anti-mesothelioma efficacy
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Abstract Malignant mesothelioma (MM) is a fatal neoplastic disease with no therapeutic option. Therefore, the search for novel therapies is of paramount importance. Methods Since mitochondrial targeting of a-tocopheryl succinate (a-TOS) by its tagging with triphenylphosphonium enhances its cytotoxic effects to cancer cells, we tested its effect on MM cells and experimental mesotheliomas. Results Mitochondrially targeted vitamin E succinate (MitoVES) was more efficient in killing MM cells than a-TOS with IC50 lower by up to two orders of magnitude. Mitochondrial association of MitoVES in MM cells was documented using its fluorescently tagged analogue. MitoVES caused apoptosis in MM cells by mitochondrial destabilization, resulting in the loss of mitochondrial membrane potential, generation of reactive oxygen species, and destabilization of respiratory supercomplexes. The role of the mitochondrial complex II in the activity of MitoVES was confirmed by the finding that MM cells with suppressed succinate quinone reductase were resistant to MitoVES. MitoVES suppressed mesothelioma growth in nude mice with high efficacy. Discussion MitoVES is more efficient in killing MM cells and suppressing experimental mesotheliomas compared with the non-targeted a-TOS, giving it a potential clinical benefit.
© 2014 Maney Publishing. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal website for access to the definitive, published version.
Medical and Health Sciences not elsewhere classified