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In vivo toxicity assessment of microplastics in Balb/C mice : study of inhalation exposure and its inflammatory effects

Digital Library of Theses and Dissertations (Universidade de São Paulo) 2024 Score: 45 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.
Ana Clara Bastos Rodrigues

Summary

Researchers examined the in vivo toxicity of inhaled microplastics in Balb/C mice, studying pulmonary inflammation, oxidative stress, and systemic effects following repeated inhalation exposure. The study found dose-dependent lung inflammation and evidence of particle translocation to other organs.

Models
Study Type In vivo

A problemática das grandes quantidades de plástico poluindo o oceano e o meio ambiente uma questão bem conhecida na sociedade do século XXI, e nas últimas décadas, levou aos órgãos de gestão ambiental à elaboração de medidas de contenção que visem limitar a produção, o uso de produtos plásticos e aumento de sua reciclagem (The Lancet, 2017). Nesse cenário, a presente tese visa avaliar como os microplásticos (MPLs) interferem na função respiratória e renal de animais tratados experimentalmente com MPLs comerciais. Inicialmente, foram adquiridos camundongos Balb/C diretamente do biotério central da FMUSP na idade de 2 semanas que permaneceram alojados no biotério do LIM05 durante 10 dias para adaptação. Foram realizados dois grupos experimentais em tempos diferentes. O primeiro grupo, tratado no mês de fevereiro de 2023, foi composto por 16 camundongos (machos e fêmeas) expostos ao microplástico de forma inalatória com auxílio de nebulizador ultrassônico. Já o segundo grupo composto por 16 camundongos, exposto em outubro de 2023 foi determinado como grupo controle, que inalou soro fisiológico também com auxílio de nebulizador ultrassônico. Os animais foram expostos durante o período de 30 dias e ambos os grupos, submetidos a eutanásia após o último dia de exposição. Previamente a eutanásia, os animais foram colocados em gaiolas metabólicas para a coleta de urina de 24h e análise do clearance de creatinina. No dia da eutanásia, foram previamente submetidos à análise de mecânica respiratória pelo aparato Flexivent System e após isso, o sangue foi coletado e os tecidos obtidos através das técnicas de necropsia em roedores. Nossos resultados sugerem que a exposição por inalação induz estresse oxidativo em tecido pulmonar e renal dos camundongos expostos. Além disso, sugere-se alteração na função pulmonar dos animais e dados do lavado broncoalveolar demonstram que a exposição pode estar modulando a resposta imunológica, aumentando a presença de linfócitos e reduzindo o número macrófagos

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