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Mild Hyperhomocysteinemia Causes Anxiety-like Behavior and Brain Hyperactivity in Rodents: Are ATPase and Excitotoxicity by NMDA Receptor Overstimulation Involved in this Effect?

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Abstract

Mild hyperhomocysteinemia is a risk factor for psychiatric and neurodegenerative diseases, whose mechanisms between them are not well-known. In the present study, we evaluated the emotional behavior and neurochemical pathways (ATPases, glutamate homeostasis, and cell viability) in amygdala and prefrontal cortex rats subjected to mild hyperhomocysteinemia (in vivo studies). The ex vivo effect of homocysteine on ATPases and redox status, as well as on NMDAR antagonism by MK-801 in same structures slices were also performed. Wistar male rats received a subcutaneous injection of 0.03 µmol Homocysteine/g of body weight or saline, twice a day from 30 to 60th–67th days of life. Hyperhomocysteinemia increased anxiety-like behavior and tended to alter locomotion/exploration of rats, whereas sucrose preference and forced swimming tests were not altered. Glutamate uptake was not changed, but the activities of glutamine synthetase and ATPases were increased. Cell viability was not altered. Ex vivo studies (slices) showed that homocysteine altered ATPases and redox status and that MK801, an NMDAR antagonist, protected amygdala (partially) and prefrontal cortex (totally) effects. Taken together, data showed that mild hyperhomocysteinemia impairs the emotional behavior, which may be associated with changes in ATPase and glutamate homeostasis, including glutamine synthetase and NMDAR overstimulation that could lead to excitotoxicity. These findings may be associated with the homocysteine risk factor on psychiatric disorders development and neurodegeneration.

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Abbreviations

ATP:

Adenine triphosphate

ATPase:

Adenosine triphosphatase enzyme

DNA:

Deoxyribonucleic acid

GLAST:

Glutamate aspartate transporter

GLT-1:

Glutamate transporter 1

HCY:

Homocysteine

HHCY:

Hyperhomocysteinemia

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Acknowledgements

The work has not been published previously and it is not under consideration for publication elsewhere and, if accepted, it will not be published elsewhere in the same form, in English or any other language, including electronically without the written consent of the copyright holder.

Funding

This study was supported by Edital Universal (Proc. 401507/2016)/Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), INCT (EN 465671/2014–4)/Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) – Brazil, and PRONEX (16/2551–0000465-0)/Fundação de Amparo à Pesquisa do Rio Grande do Sul (FAPERGS) – Brazil.

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Contributions

Authors TMS, CS, and Full Professor ATSW (head of the laboratory) developed the experimental model, behavior tests, most biochemical analyzes, statistical analyzes, and manuscript writing. Collaborators LDB and AQS developed assays of glutamate uptake and glutamine synthetase. TMS—Conceptualization, Methodology, Validation, Formal analysis, Investigation, Data Curation, Writing—Original Draft, Writing—Review & Editing, Visualization. CS—Conceptualization, Methodology, Validation, Formal analysis, Investigation, Data Curation, Writing—Original Draft. LDB—Formal analysis, Investigation, Data Curation. AQ—Formal analysis, Resource, Funding acquisition. ATSW—Conceptualization, Methodology, Validation, Formal analysis, Resources, Writing—Original Draft, Writing—Review & Editing, Visualization, Supervision, Project administration, Funding acquisition.

Corresponding author

Correspondence to Angela T. S. Wyse.

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The authors declare no conflict of interest. All authors have approved the final article.

Ethical Approval

Wistar male rats (thirty days old, 70–80 g) were obtained from the Central Animal House of Biochemistry Department, Institute of Basic Health Sciences at the Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil. Animals were maintained with lights on 7:00 a.m. at 7:00 p.m. (12:12 h light/dark cycle) in a colony room constant temperature (22 ± 1 °C), with ad libitum 20% protein commercial chow (w/w) and water (3–4 animals per home cage). The rats were randomized into two groups: control and HCY. Every effort was made to minimize the number of animals and the distress caused throughout the experiment. Official government guidelines for animal care by the Brazilian Federal Law No. 11,794 of October 08, 2008, the NIH Guide to the Care and Use of Laboratory Animals (NIH Publication No. 80–23, 1996), and the ARRIVE guidelines were followed to work development. The experimental protocol was approved by UFRGS Ethics Committee for Animals Use (#33301/2017). The reagents and part of the inputs used in the assays were purchased from Sigma-Aldrich (San Luis, Missouri, EUA) or Merck Millipore (Burlington, Massachusetts, EUA).

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dos Santos, T.M., Siebert, C., Bobermin, L.D. et al. Mild Hyperhomocysteinemia Causes Anxiety-like Behavior and Brain Hyperactivity in Rodents: Are ATPase and Excitotoxicity by NMDA Receptor Overstimulation Involved in this Effect?. Cell Mol Neurobiol 42, 2697–2714 (2022). https://doi.org/10.1007/s10571-021-01132-0

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