resumo
Microplastics (MPs) are a major contaminant in aquatic environments. Due to their size, they are likely to cause deleterious effects. In this study, we assessed the effects of MPs obtained from two commercially available plastics (PP and PET) in the polychaeta Hediste diversicolor after different periods (4 and 28 days). Toxic effects were assessed by measuring burrowing and spontaneous activities, phase I (CYP1A1, 1A2, and 3A4) activities), conjugation metabolism (GSTs), and antioxidant defense (CAT). Behavioral traits and phase I activities were nonresponsive to the presence of both plastics and for the two durations of exposure, indicating that these organisms are not affected by exposure to MPs and do not metabolize them. Conjugation metabolism was inhibited, which may be explained by the MPs' capability of inhibiting certain enzymes. CAT activity was increased in animals acutely exposed to PP and decreased in animals chronically exposed to PET. This study shows that PP- and PET-MPs do not cause adverse effects on H. diversicolor.
palavras-chave
GLUTATHIONE S-TRANSFERASES; POLYSTYRENE MICROPLASTICS; INDUCTION; INGESTION; TOXICITY; SIZE; CYTOCHROME-P450; ETHOXYRESORUFIN; NANOPARTICLES; POLLUTION
categoria
Environmental Sciences & Ecology
autores
Daniel, D; da Costa, JP; Girao, AV; Nunes, B
nossos autores
Ana Violeta Girão
Investigador Júnior
João Miguel Martins Novaes Pinto da Costa
Bolseiro de investigaçãoagradecimentos
This work was financed by the project BETTER PLASTICS-PLASTICS IN A CIRCULAR ECONOMY (POCI-01-0247-FEDER-046091, co-financed by Agencia Nacional de Inovac & atilde;o, S.A, by COMPETE 2020). This research was financially supported by CESAM (UIDP/50017/2020+UIDB/50017/2020+LA/P/0094/2020). BN and JPC also thank the following for their financial support: the Portuguese Foundation for Science and Technology (FCT), under contracts 2020.03531.CEECIND and 2021.00909.CEECIND, and BioPlasMar (PTDC/CTA-AMB/0934/2021) from the FCT.