iTRAQ-based quantitative proteomics analysis of Sprague-Dawley rats liver reveals perfluorooctanoic acid-induced lipid metabolism and urea cycle dysfunction

作者：Liu H, Sun W, Zhou Y, Griffin N, Faulkner S, Wang L · 发表于：Toxicology letters · 年份：2022 · DOI：10.1016/j.toxlet.2021.12.016 · 研究领域：Lipid Metabolism、Transcriptome、Animals、Caprylates、Environmental Pollutants、Fatty Acids、Fluorocarbons、Gene Expression、Gene Ontology、Liver、Male、Proteomics

Perfluorooctanoic acid (PFOA) is a typical C8 representative compound of perfluoroalkyl and polyfluoroalkyl substances (PFAS) widely used in industrial and domestic products. It is a persistent organic pollutant found in the environment as well as in the tissues of humans and wildlife. Despite emerging scientific and public interest, the precise mechanisms of PFOA toxicity remain unclear. In this study, male rats were exposed to 1.25, 5, and 20 mg PFOA/kg body weight/day for 14 days by gavage; food intake and bodyweight changes were recorded every day. After 14 days, blood was collected for sera biochemistry, livers were quickly stripped and weighed after execution. Part of the liver tissue was frozen by liquid nitrogen for iTRAQ-Based Quantitative Proteomics Analysis; and some was fixed in 4% paraformaldehyde (PFA) for histological section and hematoxylin-eosin (HE) staining. Urine samples were also collected and monitored by raising rats in metabolic cages. Real-time quantitative PCR and western blot was used to validate the proteomics assay after bioinformatics analysis. The results demonstrate that 20 mg/kg/d PFOA exposure cause body weight loss and significant liver swelling and reduced urea metabolism. The sera biochemistry assay shows that ALT, GGT, BILD and UREA levels have significant changes compared with normal control group and reference range of rat sera. The subsequent iTRAQ-based quantitative proteomics analysis of rat livers identified 3,327 non-redundant prot...