Abstract
The frequency of Alzheimer’s disease (AD) is growing rapidly with longer life expectancy and the consequent increase of people with a high risk of neurodegenerative diseases. Anacardic acid (AA) has several pharmacological actions, such as antioxidants, anticholinesterase, and anti-inflammatory, which are related to the protection against aging disorders. Also, the metals copper and zinc are co-factors of antioxidant enzymes that can be associated with AA to improve brain-protective action. This study aimed to evaluate the potential of AA metal complexes using copper and zinc chelators to produce potential agents against Alzheimer’s disease. For this purpose, Cu and Zn were linked to AA in the ratio of 1:1 in a basic medium. The complexes’ formation was confirmed by ultraviolet and visible spectroscopy. The toxicity was evaluated in the zebrafish model, and other information related to AD was obtained using the zebrafish model of anxiety. AA-Zn and AA-Cu complexes showed better antioxidant action than free AA. In the anti-AChE activity, AA was like the AA-Cu complex. In models using adult zebrafish, no toxicity for AA complexes was found, and in the locomotor model, AA-Cu demonstrated possible anxiolytic action. In in silico experiments comparing AA and AA-Cu complex, the coupling energy with the enzyme was lower for the AA-Cu complex, showing better interaction, and also the distances of the active site amino acids with this complex were lower, similar to galantamine, the standard anti-AChE inhibitor. Thus, AA-Cu showed interesting results for more detailed study in experiments related to Alzheimer’s disease.
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Acknowledgements
The authors thank the government agencies Funcap and CNPq for the financial support of the research project (No. 3781047/2017, Program for the SUS-PPSUS-Funcap-Decit/ACTIE/MS-CNPq).
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da Silva, W.M.B., Pinheiro, S.d.O., Alves, D.R. et al. Anacardic Acid Complexes as Possible Agents Against Alzheimer’s Disease Through Their Antioxidant, In vitro, and In silico Anticholinesterase and Ansiolic Actions. Neurotox Res 39, 467–476 (2021). https://doi.org/10.1007/s12640-020-00306-w
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DOI: https://doi.org/10.1007/s12640-020-00306-w