Abstract
Alzheimer’s disease (AD) is one of the most complicated neurodegenerative diseases, and several hypotheses have been associated with its development and progression, such as those involving glucose hypometabolism, the cholinergic system, calcium imbalance, inflammation, oxidative imbalance, microtubule instability, and the amyloid cascade, several of which are related to oxidative stress (free radical generation), which contributes to neuronal death. Therefore, several efforts have been made to establish a sporadic AD model that takes into account these hypotheses. One model that replicates the increase in amyloid beta (Aβ) and oxidative stress in vivo is the scopolamine model. In the present work, the chronic administration (6 weeks) of scopolamine was used to analyze the neuroprotective effects of apocynin and galantamine. The results showed that scopolamine induced cognitive impairment, which was evaluated 24 h after the final dose was administered. In addition, after scopolamine administration, the Aβ and superoxide anion levels were increased, and NADPH oxidase 2 (NOX2), nuclear factor erythroid 2-related factor 2 (Nrf2), and nuclear factor kappa B (NFkB) genes were overexpressed. These effects were not observed when either apocynin or galantamine was administered during the last 3 weeks of scopolamine treatment, and although the results from both molecules were related to lower Aβ production and, consequently, lower superoxide anion production, they were likely realized through different pathways. That is, both apocynin and galantamine diminished NADPH oxidase expression, but their effects on transcription factor expression differed. Moreover, experiments in silico showed that galantamine did not interact with the active site of beta secretase, whereas diapocynin, an apocynin metabolite, interacted with the beta-site APP-cleaving enzyme (BACE1) at the catalytic site.
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Funding
This work was supported by grants from Consejo Nacional de Ciencia y Tecnología CB286653, SIPCOFAA-IPN, SIP20195089 for MCRH and CONACYT 254600 and 782 for JCB and scholarships from Consejo Nacional de Ciencia y Tecnología to study MD to EJ.
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Joseph, E., Villalobos-Acosta, D.M.Á., Torres-Ramos, M.A. et al. Neuroprotective Effects of Apocynin and Galantamine During the Chronic Administration of Scopolamine in an Alzheimer’s Disease Model. J Mol Neurosci 70, 180–193 (2020). https://doi.org/10.1007/s12031-019-01426-5
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DOI: https://doi.org/10.1007/s12031-019-01426-5