Abstract
Pharmacoencephalography (pharmaco-EEG) is a prominent instrument for the pharmacological screening of new psychoactive molecules. This experimental approach has not remained a vestige of neurobiological studies, and can be used successfully to complete today’s research objectives. The development and rise to universal use of machine learning techniques opens up novel prospects for the use of pharmaco-EEG data to solve the problems of classification and prognosis. We have previously shown that naïve Bayes classifier (NBC) combined with principal component analysis (PCA) can be used to differentiate between antipsychotic and sedative drug effects as well as to distinguish among the antipsychotics’ effects. In the present study, we evaluated the possibility to employ this method to assess the dose-dependency of antipsychotic effects. The experiments were carried out in white outbred male rats with chronically implanted electrocorticographic electrodes. As the agents of interest, we chose two drugs with antipsychotic activity, chlorpromazine and promethazine, in three doses each (0.1, 1, 10 mg/kg and 0.5, 5 and 20 mg/kg, respectively). The training set, used as a reference to determine the pharmacological effects of the agents of interest, included the D2-dopamine receptor blocker haloperidol, M-cholinergic receptor blocker tropicamide, H1-histamine receptor blocker chloropyramine, the sedative dexmedetomidine, and the anxiolytic phenazepam. We have shown that the lowest chlorpromazine dose (0.1 mg/kg) can be characterized as antipsychotic with a marked histaminolytic effect, while the highest one (10 mg/kg) exhibits predominantly antipsychotic activity with a cataleptogenic effect. All three doses demonstrated anticholinergic activity, which increased with the dose. For promethazine, we observed a clear dose-dependent shift from antipsychotic action to cataleptogenic, alongside a notable antimuscarinic effect of all doses. None of promethazine doses showed any resemblance to chloropyramine, which probably indicates its anti-dopaminergic and antimuscarinic effects being able to mask its H1-antihistamine effect in the used dose range. In summary, our results demonstrate that NBC combined with PCA can be used to determine the dose-dependency of antipsychotic agents’ effects based on their impact on electrocorticogram parameters. Further development of this method as well as expansion of psychotropic agent electropharmacogram library would allow for more precise prediction of pharmacological activity of the agents of interest.
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Funding
This work was supported by Russian Science Foundation grant 23-75-01051 (creation of a library of electrocorticogram records), State Program GP-47 “Scientific and Technological Development of the Russian Federation” (2019–2030), topic 0113-2019-0006 (Yu.I.S.), under the projects 93022925/94030803 St. Petersburg State University (Yu.I.S.) and no. 075-10-2021-093 (Project NRB-RND-2115, Yu.I.S.) with the financial support of the Ministry of Science and Higher Education of the Russian Federation, as well as at the expense of the state assignment of the N.P. Bechtereva Institute of the Human Brain (development of methods of mathematical analysis, topic state registration number 122041500045-8).
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Idea of work and planning the experiment (Yu.I.S., S.V.O.), experimentation and data processing (Yu.I.S., M.V.S., D.D.Sh., M.M.P., I.S.K., M.S.K.), preparing illustrations (Yu.I.S., V.A.P., I.S.K., M.S.K.), writing and editing the manuscript (Yu.I.S., V.A.P., I.A.T., N.O.S., S.V.O.).
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Experiments using laboratory animals were performed in accordance with the requirements of Directive 2010/63/EU of the European Parliament and Council of September 22, 2010, the principles of the Basel Declaration and the requirements of the Council of the Eurasian Economic Union from November 03, 2016 no. 81 “On Approval of the Rules of Good Laboratory Practice of the Eurasian Economic Union in the field of circulation of medicines”. The protocol of the experiment was approved by the bioethical commission of Saint Petersburg State Chemical and Pharmaceutical University of the Ministry of Health of Russia (protocol-application R-PEEG2-SA-2022 dated February 15, 2022). All measures were taken to reduce the number of animals used and minimize their suffering.
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Russian Text © The Author(s), 2023, published in Rossiiskii Fiziologicheskii Zhurnal imeni I.M. Sechenova, 2023, Vol. 109, No. 11, pp. 1665–1683https://doi.org/10.31857/S0869813923110110.
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Sysoev, Y.I., Shits, D.D., Puchik, M.M. et al. Pharmacoencephalographic Assessment of Antiphyschotic Agents’ Effect Dose-Dependency in Rats. J Evol Biochem Phys 59, 2153–2167 (2023). https://doi.org/10.1134/S0022093023060200
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DOI: https://doi.org/10.1134/S0022093023060200