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The fruit pulp of the palm<jats:italic>Acrocomia aculeata<\/jats:italic>(Jacq.) Lodd. ex Mart. is widely used in the treatment of various illnesses, but as far as we know, there are no reports regarding the properties of its leaves. Thus, we aimed to evaluate the antioxidant activity of<jats:italic>A. aculeata<\/jats:italic>leaf extracts obtained with water (EA-Aa), ethanol (EE-Aa), and methanol (EM-Aa) solvents. The extracts were chemically characterized, and their antioxidant activity was assessed through the scavenging of the free radicals DPPH and ABTS. EE-Aa and EM-Aa showed the highest amounts of phenolic compounds and free radical scavenging activity. However, EA-Aa was more efficient to protect human erythrocytes against AAPH-induced hemolysis and lipid peroxidation. Thus, we further show the antioxidant effect of EA-Aa in preventing AAPH-induced protein oxidation, H<jats:sub>2<\/jats:sub>O<jats:sub>2<\/jats:sub>-induced DNA fragmentation, and ROS generation in Cos-7 cells. Increased levels of Sirt1, catalase, and activation of ERK and Nrf2 were observed in Cos-7 treated with EA-Aa. We also verify increased survival in nematodes<jats:italic>C. elegans<\/jats:italic>, when induced to the oxidative condition by Juglone. Therefore, our results showed a typical chemical composition of plants for all extracts, but the diversity of compounds presented in EA-Aa is involved in the lower toxicity and antioxidant properties provided to the macromolecules tested, proteins, DNA, and lipids. This protective effect also proven in Cos-7 and in<jats:italic>C. elegans<\/jats:italic>was probably due to the activation of the Sirt1\/Nrf2 pathway. Altogether, the low toxicity and the antioxidant properties of EA-Aa showed in all the experimental models support its further use in the treatment of oxidative stress-related diseases.<\/jats:p>","DOI":"10.1155\/2020\/5238650","type":"journal-article","created":{"date-parts":[[2020,3,10]],"date-time":"2020-03-10T23:36:54Z","timestamp":1583883414000},"page":"1-16","source":"Crossref","is-referenced-by-count":15,"title":["<i>Acrocomia aculeata<\/i>(Jacq.) Lodd. ex Mart. 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