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Energization by multiple substrates and calcium challenge reveal dysfunctions in brain mitochondria in a model related to acute psychosis

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Abstract

Schizophrenia etiology is unknown, nevertheless imbalances occurring in an acute psychotic episode are important to its development, such as alterations in cellular energetic state, REDOX homeostasis and intracellular Ca2+ management, all of which are controlled primarily by mitochondria. However, mitochondrial function was always evaluated singularly, in the presence of specific respiratory substrates, without considering the plurality of the electron transport system. In this study, mitochondrial function was analyzed under conditions of isolated or multiple respiratory substrates using brain mitochondria isolated from MK-801-exposed mice. Results showed a high H2O2 production in the presence of pyruvate/malate, with no change in oxygen consumption. In the condition of multiple substrates, however, this effect is lost. The analysis of Ca2+ retention capacity revealed a significant change in the uptake kinetics of this ion by mitochondria in MK-801-exposed animals. Futhermore, when mitochondria were exposed to calcium, a total loss of oxidative phosphorylation and an impressive increase in H2O2 production were observed in the condition of multiple substrates. There was no alteration in the activity of the antioxidant enzymes analyzed. The data demonstrate for the first time, in an animal model of psychosis, two important aspects (1) mitochondria may compensate deficiencies in a single mitochondrial complex when they oxidize several substrates simultaneously, (2) Ca2+ handling is compromised in MK-801-exposed mice, resulting in a loss of phosphorylative capacity and an increase in H2O2 production. These data favor the hypothesis that disruption of key physiological roles of mitochondria may be a trigger in acute psychosis and, consequently, schizophrenia.

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Acknowledgments

Antonio Galina had fellowships from the Brazilian National Concil for Research (CNPq 30712/2016-8) from 2015 to 2018 and from Cientista do Nosso Estado (CNE) of Fundação Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro (FAPERJ E-26/203.004/2017). Mariana S. Silveira had a fellowship from the Brazilian National Concil for Research (CNPq 308910/2013-3) from 2013 to 2018. Gilda A. Neves received funding from Fundação Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro (FAPERJ, PensaRio Grant number E-26/110.678/2012).

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Correspondence to Mariana S. Silveira or Antonio Galina.

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Monteiro, J., Assis-de-Lemos, G., de-Souza-Ferreira, E. et al. Energization by multiple substrates and calcium challenge reveal dysfunctions in brain mitochondria in a model related to acute psychosis. J Bioenerg Biomembr 52, 1–15 (2020). https://doi.org/10.1007/s10863-019-09816-5

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  • DOI: https://doi.org/10.1007/s10863-019-09816-5

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