Abstract
The purpose of this study is to evaluate the effects of Methylphenidate exposure on mice odontogenesis and connect them by bioinformatics with human odontogenesis. Thirty-two pregnant Swiss mice were divided into treated group and control group, which received, respectively, 5 mg/kg of Methylphenidate and saline solution from the 5th to the 17th day of pregnancy. The mouse embryos tooth germs were analyzed through optical microscopy, and the data collected were analyzed statistically by Fisher’s exact test. The presence and similarity of Methylphenidate-associated genes (Pharmgkb database) in both organisms and their interaction with dental development genes (AmiGO2 database) were verified on STRING database. Rates of tooth germ malformations were higher in treated than in control group (Control: 18; Treated: 27; p = 0.035). Mouse embryo malformations were connected with 238 interactions between 69 dental development genes with 35 Methylphenidate genes. Fourteen interactions for four Methylphenidate genes with four dental development genes, with human experimental data, were connected with mouse phenotype data. By homology, the interactions and conservation of proteins/genes may indicate similar outcomes for both organisms. The exposure to Methylphenidate during pregnancy affected odontogenesis in mouse embryos and may affect human odontogenesis. The study of malformations in mice, with a bioinformatics approach, could contribute to understanding of the Methylphenidate effect on embryo development. These results may provide novel hypotheses for further testing and reinforce the FDA protocol: as Methylphenidate is included in category C, its use during pregnancy should be considered if the benefits outweigh the risks.
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Acknowledgements
The authors acknowledge Miss Lorena Frítola, who provided all the help needed with the text translation.
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This study was all supported by the authors’ resources and did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
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KSL: investigation, methodology, project administration, resources, and writing—review and editing. GAC: investigation, methodology, project administration, resources, and writing—review and editing. AES: data curation, writing—review and editing. SPR: data curation, writing—original draft, and writing—review and editing. MFY: software, validation, visualization, writing—original draft, and writing—review and editing. VRP-C: software, validation, visualization, and writing—review and editing. RLLFL: software, validation, visualization, and writing—review and editing. MJSS: conceptualization, data curation, project administration, formal analysis, funding acquisition, investigation, supervision, validation, visualization, and writing.
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All procedures described herein comply with ARRIVE guidelines and are following the National Institutes of Health (NIH) guidelines regarding the care and use of animals for experimental procedures (National Research Council, 2011). They were also approved by the Ethics Committee for Animal Experimentation of the State University of Londrina (9397.2014.90) and carried out with the consent of each author.
Research involving human participants and/or animals: statement of animal welfare
To guarantee the welfare of the animals from the sample of this study, the research team considered some practices during the experimental phase: the maintenance of controlled conditions of light and temperature in the bioterium; unlimited access to water and feed; the allocation of animals in the proportion of two female mice for each male mice, in cages, measuring 30 × 20 cm × 13 cm, made of polypropylene with a zinc-plated wire cover and lined with wood shavings; the realization of daily treatments by only two people out of the research team, most quickly and comfortably; euthanasia most quickly and comfortably.
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Lima, K.S., Salles, A.E.S., de Araújo Costa, G. et al. Methylphenidate effects on mice odontogenesis and connections with human odontogenesis. Odontology 109, 336–348 (2021). https://doi.org/10.1007/s10266-020-00548-2
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DOI: https://doi.org/10.1007/s10266-020-00548-2