Abstract
Elevated levels of homocysteine (Hcy) in the blood, called hyperhomocysteinemia (HHcy), is a prevalent risk factor for it has been shown that Hcy induces oxidative stress and increases microglial activation and neuroinflammation, as well as causes cognitive impairment, which have been linked to the neurodegenerative process. This study aimed to evaluate the effect of mild hyperhomocysteinemia with or without ibuprofen and rivastigmine treatments on the behavior and neurochemical parameters in male rats. The chronic mild HHcy model was chemically induced in Wistar rats by subcutaneous administration of Hcy (4055 mg/kg body weight) twice daily for 30 days. Ibuprofen (40 mg/kg) and rivastigmine (0.5 mg/kg) were administered intraperitoneally once daily. Motor damage (open field, balance beam, rotarod, and vertical pole test), cognitive deficits (Y-maze), neurochemical parameters (oxidative status/antioxidant enzymatic defenses, presynaptic protein synapsin 1, inflammatory profile parameters, calcium binding adapter molecule 1 (Iba1), iNOS gene expression), and cholinergic anti-inflammatory pathway were investigated. Results showed that mild HHcy caused cognitive deficits in working memory, and impaired motor coordination reduced the amount of synapsin 1 protein, altered the neuroinflammatory picture, and caused changes in the activity of catalase and acetylcholinesterase enzymes. Both rivastigmine and ibuprofen treatments were able to mitigate this damage caused by mild HHcy. Together, these neurochemical changes may be associated with the mechanisms by which Hcy has been linked to a risk factor for AD. Treatments with rivastigmine and ibuprofen can effectively reduce the damage caused by increased Hcy levels.
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Data Availability
Raw data are available from the authors upon request.
Abbreviations
- Hcy:
-
Homocysteine
- HHcy:
-
Hyperhomocysteinemia
- AD:
-
Alzheimer's disease
- ROS:
-
Reactive oxygen species
- DCFH:
-
Dihydrochlorofluorscein
- TBARS:
-
Reactive substances of thiobarbituric acid
- CAT:
-
Catalase
- SOD:
-
Superoxide dismutase
- Iba1:
-
Ionized calcium-binding adapter molecule 1
- iNOS:
-
Inducible nitric oxide synthase
- TNF-α:
-
Tumor necrosis factor-alpha
- IL-1β:
-
Interleukin 1 beta
- IL-6:
-
Interleukin 6
- IL-10:
-
Interleukin 10
- ACh:
-
Acetylcholine
- AChE:
-
Acetylcholinesterase
- ChAT:
-
Acetyltransferase
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Funding
This study was supported by INCT (EN 465671/2014–4)/Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) — Brazil, PRONEX (16/2551–0000465-0)/Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul (FAPERGS) —Brazil, and Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ) (E-26/202.701/2019; E-26/010.002422/2019; E-26/010.002260/2019) — Brazil.
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Osmar V. Ramires Júnior: conceptualization, methodology, validation, formal analysis, investigation, data curation, writing—original draft, writing — review and editing, visualization. Tiago M. dos Santos: methodology, validation, formal analysis, investigation. Josiane S. Silveira: methodology and investigation. Raíssa Leite-Aguiar: methodology, validation, formal analysis. Robson Coutinho-Silva funding acquisition. Luiz E. B. Savio: methodology, formal analysis, resource, funding acquisition, review and editing. Angela T. S. Wyse: conceptualization, methodology, validation, formal analysis, resources, writing — original draft, writing — review and editing, visualization, supervision, project administration, funding acquisition.
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All animal experiments were carried out in accordance with the official government guidelines for the care of animals by the Brazilian Federal Law No. 11,794 of October 8, 2008, which regulates the Brazilian Guidelines for the Care and Use of Animals for Scientific and Educational Purposes, and according to the Guide for the Care and Use of Laboratory Animals of the National Institutes of Health (NIH). The study was approved by the Ethics Committee of the Federal University of Rio Grande do Sul (UFRGS) (36991/2019).
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Ramires Junior, O.V., dos Santos, T.M., Silveira, J.S. et al. Rivastigmine Reverses the Decrease in Synapsin and Memory Caused by Homocysteine: Is There Relation to Inflammation?. Mol Neurobiol 59, 4517–4534 (2022). https://doi.org/10.1007/s12035-022-02871-x
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DOI: https://doi.org/10.1007/s12035-022-02871-x