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Current Medicinal Chemistry


ISSN (Print): 0929-8673
ISSN (Online): 1875-533X

Review Article

The Role of Alternative Toxicological Trials in Drug Discovery Programs. The Case of Caenorhabditis elegans and Other Methods

Author(s): Gabriela Göethel*, Lucas Volnei Augsten, Gustavo Machado das Neves, Itamar Luís Gonçalves, João Pedro Silveira de Souza, Solange Cristina Garcia and Vera Lucia Eifler-Lima*

Volume 29, Issue 32, 2022

Published on: 13 July, 2022

Page: [5270 - 5288] Pages: 19

DOI: 10.2174/0929867329666220329190825

Price: $65


The discovery of a new drug requires over a billion dollars and around 12 years of research efforts, and toxicity is the leading reason for the failure to approve candidate drugs. Many alternative methods have been validated to detect toxicity as early as possible to diminish the waste of resources and efforts in medicinal chemistry research, and in vivo alternative methods are especially valuable for the amount of information they can provide at little cost and in a short time. In this work, we present a review of the literature published between the years 2000 and 2021 on in vivo alternative methods of toxicity screening employed in medicinal chemistry, which we believe will be useful because, in addition to shortening the research time, these studies provide much additional information aside from the toxicity of drug candidate compounds. These in vivo models include zebrafish, Artemia salina, Galleria mellonella, Drosophila melanogaster, planarians, and Caenorhabditis elegans. The most published ones in the last decade were zebrafish, D. melanogaster, and C. elegans due to their reliability, ease, and cost-effectiveness in implementation and flexibility. Special attention is given to C. elegans because of its rising popularity, a wide range of uses, including toxicity screening, and active effects measurement, from antioxidant effects to anthelmintic and antimicrobial activities, and its fast and reliable results. Over time, C. elegans also became a viable high-throughput (HTS) automated drug screening option. Additionally, this manuscript lists briefly the other screening methods used for the initial toxicological analyses and the role of alternative in vivo methods in these scenarios, classifying them as in silico, in vitro and alternative in vivo models that have been receiving a growing increase in interest in recent years.

Keywords: Medicinal chemistry, drug development, toxicity screening, alternative models, toxicology trials, drug discovery, Caenorhabditis elegans.

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