Abstract
Identification of the mechanisms by which drugs of abuse cause neuronal dysfunction is essential for understanding the biological bases of their acute and long-lasting effects in the brain. Here, we performed real-time functional experiments of axonal transport of mitochondria to explore the role of in situ mitochondrial dysfunction in 3,4-methylenedioxymethamphetamine (MDMA; “ecstasy”)-related brain actions. We showed that MDMA dramatically reduced mitochondrial trafficking in hippocampal neurons in a Tau-dependent manner, in which glycogen synthase kinase 3β activity was implicated. Furthermore, we found that these trafficking abnormalities were rescued by over-expression of Mitofusin2 and dynamin-related protein 1, but not of Miro1. Given the relevance of mitochondrial targeting for neuronal function and neurotransmission, our data underscore a novel mechanism of action of MDMA that may contribute to our understanding of how this drug of abuse alters neuronal functioning.
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Acknowledgments
We thank Luca Scorrano (University of Geneva) and Miquel Vila (VHIR, Barcelona) for providing the Mitofusin and Drp1 constructs, and Isidre Ferrer (University of Barcelona) for providing the P-Tau Thr181 antibody. This study was supported by grant BFU2008-3980 (“Ministerio de Ciencia e Innovacion” (MICINN), Spain) and a grant from the “Plan Nacional de Drogas” to ES, and by the “Fundação para a Ciência e Tecnologia (FCT),” Portugal (Project PTDC/SAU-FCF/102958/2008), under the framework of the “Programa Operacional Temático Factores de Competitividade (COMPTE) do Quadro Comunitário de Apoio III” and “Fundo Comunitário Europeu (FEDER)” (FCOMP-01-0124-FEDER-011079). DJB’s stay at IRB Barcelona was partially supported by FCT, Portugal. DJB was supported by fellowship (SFRH/BD/64939/2009) from FCT, Portugal.
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Daniel José Barbosa and Romàn Serrat have contributed equally to this work.
Félix Carvalho and Eduardo Soriano are co-senior authors.
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204_2014_1209_MOESM1_ESM.avi
Supplementary Movie 1 Axonal transport of mitochondria in a hippocampal neuron, at 6DIV, under control conditions. (AVI 596 kb)
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Supplementary Movie 2 Axonal transport of mitochondria in a hippocampal neuron, after exposure to MDMA (1.6 mM), for 90 min. (AVI 572 kb)
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Barbosa, D.J., Serrat, R., Mirra, S. et al. MDMA impairs mitochondrial neuronal trafficking in a Tau- and Mitofusin2/Drp1-dependent manner. Arch Toxicol 88, 1561–1572 (2014). https://doi.org/10.1007/s00204-014-1209-7
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DOI: https://doi.org/10.1007/s00204-014-1209-7