Methylmercury-induced cytotoxicity and oxidative biochemistry impairment in dental pulp stem cells: the first toxicological findings.

Autor:	de Souza-Rodrigues RD; Institute of Arts Sciences, Federal University of Pará (UFPA), Belém, Pará, Brazil, Brazil.; Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará (UFPA), Belém, Pará, Brazil, Brazil., Puty B; Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará (UFPA), Belém, Pará, Brazil, Brazil.; Laboratory of Tissue Culture and Cytogenetics, Environment Section, Evandro Chagas Institute, Ananindeua, Pará, Brazil., Bonfim L; Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará (UFPA), Belém, Pará, Brazil, Brazil.; Laboratory of Tissue Culture and Cytogenetics, Environment Section, Evandro Chagas Institute, Ananindeua, Pará, Brazil., Nogueira LS; Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará (UFPA), Belém, Pará, Brazil, Brazil.; Laboratory of Tissue Culture and Cytogenetics, Environment Section, Evandro Chagas Institute, Ananindeua, Pará, Brazil., Nascimento PC; Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará (UFPA), Belém, Pará, Brazil, Brazil., Bittencourt LO; Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará (UFPA), Belém, Pará, Brazil, Brazil., Couto RSD; Faculty of Dentistry, Federal University of Pará (UFPA), Belém, Pará, Brazil., Barboza CAG; Department of Morphology, Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil., de Oliveira EHC; Laboratory of Tissue Culture and Cytogenetics, Environment Section, Evandro Chagas Institute, Ananindeua, Pará, Brazil., Marques MM; Graduation Program, School of Dentistry, Ibirapuera University (UNIb), São Paulo, Brazil., Lima RR; Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará (UFPA), Belém, Pará, Brazil, Brazil.
Jazyk:	angličtina
Zdroj:	PeerJ [PeerJ] 2021 Jun 10; Vol. 9, pp. e11114. Date of Electronic Publication: 2021 Jun 10 (Print Publication: 2021).
DOI:	10.7717/peerj.11114
Abstrakt:	Background: Methylmercury (MeHg) is a potent toxicant able to harm human health, and its main route of contamination is associated with the consumption of contaminated fish and other seafood. Moreover, dental amalgams are also associated with mercury release on human saliva and may contribute to the accumulation of systemic mercury. In this way, the oral cavity seems to be the primary location of exposure during MeHg contaminated food ingestion and dental procedures but there is a lack of literature about its effects on dental tissues and the impact of this toxicity on human health. In this way, this study aimed to analyze the effects of different doses of MeHg on human dental pulp stem cells after short-term exposure. Methods: Dental pulp stem cells from human exfoliated deciduous teeth (SHED) were treated with 0.1, 2.5 and 5 µM of MeHg during 24 h. The MeHg effects were assessed by evaluating cell viability with Trypan blue exclusion assay. The metabolic viability was indirectly assessed by MTT reduction assay. In order to evaluate an indicative of antioxidant defense impairment, cells exposed to 0.1 and 5 µM MeHg were tested by measuring glutathione (GSH) level. Results: It was observed that cell viability decreased significantly after exposure to 2.5 and 5 µM of MeHg, but the metabolic viability only decreased significantly at 5 µM MeHg exposure, accompanied by a significant decrease in GSH levels. These results suggest that an acute exposure of MeHg in concentrations higher than 2.5 µM has cytotoxic effects and reduction of antioxidant capacity on dental pulp stem cells. Competing Interests: The authors declare that they have no competing interests. (© 2021 Souza-Rodrigues et al.)
Databáze:	MEDLINE
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