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Experimental evidence of tyrosine neurotoxicity: focus on mitochondrial dysfunction

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Abstract

Tissue exposure to high levels of tyrosine, which is characteristic of an inborn error of metabolism named Tyrosinemia, is related to severe symptoms, including neurological alterations. The clinical manifestations and pathogenesis of tyrosine neurotoxicity can be recapitulated in experimental models in vivo and in vitro. A widely used experimental model to study brain tyrosine damage is the chronic and acute administration of this amino acid in infant rats. Other research groups and we have extensively studied the pathogenic events in the brain structures of rats exposed to high tyrosine levels. Rats administered acutely and chronically with tyrosine presented decreased and inhibition of the essential metabolism enzymes, e.g., Krebs cycle enzymes and mitochondrial respiratory complexes in the brain structures. These alterations induced by tyrosine toxicity were associated with brain oxidative stress, astrocytes, and, ultimately, cognitive impairments. Notably, in vivo data were corroborated by in vitro studies using cerebral regions homogenates incubated with tyrosine excess. Considering metabolism’s importance to brain functioning, we hypothesized that mitochondrial and metabolic dysfunctions are closely related to neurological alterations induced by tyrosine neurotoxicity. Herein, we reviewed the main mechanisms associated with tyrosine neurotoxicity in experimental models, emphasizing the role of mitochondrial dysfunction.

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Data sharing not applicable to this article as no datasets were generated or analyzed during the current study. This article is a review of information content in previous works.

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Funding

This research was supported by grants from Universidade do Extremo Sul Catarinense (UNESC), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq).

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All authors were involved in literature review, writing the manuscript, and figure preparation.

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Correspondence to Emilio Luiz Streck.

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The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

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de Oliveira, J., Farias, H.R. & Streck, E.L. Experimental evidence of tyrosine neurotoxicity: focus on mitochondrial dysfunction. Metab Brain Dis 36, 1673–1685 (2021). https://doi.org/10.1007/s11011-021-00781-w

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  • DOI: https://doi.org/10.1007/s11011-021-00781-w

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