Abstract
The vitamin E derivative (+)α-tocopheryl succinate (α-TOS) exerts pro-apoptotic effects in a wide range of tumors and is well tolerated by normal tissues. Previous studies point to a mitochondrial involvement in the action mechanism; however, the early steps have not been fully elucidated. In a model of acute promyelocytic leukemia (APL) derived from hCG-PML-RARα transgenic mice, we demonstrated that α-TOS is as effective as arsenic trioxide or all-trans retinoic acid, the current gold standards of therapy. We also demonstrated that α-TOS induces an early dissipation of the mitochondrial membrane potential in APL cells and studies with isolated mitochondria revealed that this action may result from the inhibition of mitochondrial respiratory chain complex I. Moreover, α-TOS promoted accumulation of reactive oxygen species hours before mitochondrial cytochrome c release and caspases activation. Therefore, an in vivo antileukemic action and a novel mitochondrial target were revealed for α-TOS, as well as mitochondrial respiratory complex I was highlighted as potential target for anticancer therapy.
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Acknowledgements
We are grateful to AB Garcia and DA Gallo for technical assistance in flow cytometry and to CL Silva and LL Alves for handling of transgenic mice. RSAL, PSS, BAASL, ARLA and FPR received financial support from Fundação de Amparo a Pesquisa do Estado de São Paulo (FAPESP); HLGT and CRP from Coordenação de Aperfeiçoamento de pessoal de nível superior (CAPES). This work was supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq—grant # 573754/2008-0) and Fundação de Apoio à Pesquisa do Estado de São Paulo (FAPESP—grant # 1998/14247-6).
Author contributions
GASS designed and performed research, analyzed data and wrote the paper. RSAL performed research and analyzed data of the ‘in vivo experiments’. BAAS-L performed research of the ‘in vivo experiments’. SAU, PPP and HT contributed vital new reagents or analytical tools and discussed data. CC and EMR designed experiments and wrote the paper. All other co-authors performed experiments and analyzed data.
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dos Santos, G., Abreu e Lima, R., Pestana, C. et al. (+)α-Tocopheryl succinate inhibits the mitochondrial respiratory chain complex I and is as effective as arsenic trioxide or ATRA against acute promyelocytic leukemia in vivo. Leukemia 26, 451–460 (2012). https://doi.org/10.1038/leu.2011.216
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DOI: https://doi.org/10.1038/leu.2011.216
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