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Hyperhomocysteinemia-Induced Oxidative Stress Exacerbates Cortical Traumatic Brain Injury Outcomes in Rats

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Abstract

Traumatic brain injury (TBI) is a leading cause of morbidity and mortality among military service members and civilians in the United States. Despite significant advances in the understanding of TBI pathophysiology, several clinical reports indicate that multiple genetic and epigenetic factors can influence outcome. Homocysteine (HCY) is a non-proteinogenic amino acid, the catabolism of which can be dysregulated by stress, lifestyle, aging, or genetic abnormalities leading to hyperhomocysteinemia (HHCY). HHCY is a neurotoxic condition and a risk factor for multiple neurological and cardiovascular disorders that occurs when HCY levels is clinically > 15 µM. Although the deleterious impact of HHCY has been studied in human and animal models of neurological disorders such as stroke, Alzheimer’s disease and Parkinson's disease, it has not been addressed in TBI models. This study tested the hypothesis that HHCY has detrimental effects on TBI pathophysiology. Moderate HHCY was induced in adult male Sprague Dawley rats via daily administration of methionine followed by impact-induced traumatic brain injury. In this model, HHCY increased oxidative stress, upregulated expression of proteins that promote blood coagulation, exacerbated TBI-associated blood–brain barrier dysfunction and promoted the infiltration of inflammatory cells into the cortex. We also observed an increase of brain injury-induced lesion size and aggravated anxiety-like behavior. These findings show that moderate HHCY exacerbates TBI outcomes and suggest that HCY catabolic dysregulation may be a significant biological variable that could contribute to TBI pathophysiology heterogeneity.

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Funding

This study was funded by the U.S Air Force (Grant # FA8650-17–2-6H10).

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Contributions

Experimental design: FT, CM, GF; Manuscript writing: FT; Manuscript editing: AP, GF, MG; Performing experiments: FT, FL, MG, LR; Data analysis: FT, AP, MG, GF.

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Correspondence to Flaubert Tchantchou.

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All authors declare no conflict of interest.

Research Involving Human Participants and/or Animals

This research involves animals.

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All animal procedures were approved by the University of Maryland, Baltimore, Animal Use and Care Committee and, the US Air Force (USAF) Animal Use Programs Office of Research Oversight & Compliance, and the Army Medical Research and Materiel Command (USAMRMC) Animal Care and Use Review Office (ACURO) in compliance with all federal regulations governing the protection of animals and research.

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Tchantchou, F., Goodfellow, M., Li, F. et al. Hyperhomocysteinemia-Induced Oxidative Stress Exacerbates Cortical Traumatic Brain Injury Outcomes in Rats. Cell Mol Neurobiol 41, 487–503 (2021). https://doi.org/10.1007/s10571-020-00866-7

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  • DOI: https://doi.org/10.1007/s10571-020-00866-7

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