Abstract
Fatty amides (N-alkylamides) are bioactive lipids that are widely distributed in microorganisms, animals, and plants. The low yield in the extraction process of spilantol, a fatty amide, which is mainly related to its diverse biological effects, compromises its application on a large scale. Thus, this study proposes an alternative method to synthesise fatty amides from Bertholletia excelsa (AGBe) oil, with a chemical structure similar to that of spilantol. Carrageenan-induced abdominal oedema in vivo models were used in zebrafish (Danio rerio). In in vivo studies, oral AGBe produced no signs of toxicity. In the histopathological study, AGBe did not cause significant changes in the main metabolising organs (liver, kidneys, and intestines). All doses of AGBe (100 mg/kg, 500 mg/kg, and 750 mg/kg) were effective in reducing oedema by 65%, 69%, and 95%, respectively, producing a dose–response effect compared to the control group, and spilantol-inhibited oedema by 48%. In the in silico study, with the use of molecular docking, it was observed that among the AGBe, the molecules 18:1, ω-7-ethanolamine, and 18:1, ω-9-ethanolamine stood out, with 21 interactions for COX-2 and 20 interactions for PLA2, respectively, surpassing the spilantol standard with 15 interactions for COX-2 and PLA2. The anti-inflammatory action hypothesis was confirmed in the in silico study, demonstrating the involvement of AGBe in the process of inhibiting the enzymes COX-2 and PLA2. Therefore, based on all the results obtained and the fact that until the dose of 1000 mg/kg was administered orally in zebrafish, it was not possible to determine the LD50; it can be said that AGBe is effective and safe for anti-inflammatory activity.
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Acknowledgements
The authors would like to thank the PAEC OEA/GCUB Program No. 001/2018, under the cooperation agreement between the Organization of American States (OAS) and the Coimbra Group of Brazilian Universities (CGUB) for the financial support for student YFQU.
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BR obtained and characterised AGBe under the guidance of the IMF. In vivo biological assays were performed using YFQU and SFB with GCS, BLSO, and RSB. LISHM carried out the in silico study, and JCTC participated as the general coordinator of the study and reviewer of the data obtained.
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Quitian-Useche, Y.F., Sánchez-Ortiz, B.L., Borges, S.F. et al. Fatty ethanolamide of Bertholletia excelsa triglycerides (Brazil nuts): anti-inflammatory action and acute toxicity evaluation in Zebrafish (Danio rerio). Inflammopharmacol 29, 1519–1537 (2021). https://doi.org/10.1007/s10787-021-00867-y
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DOI: https://doi.org/10.1007/s10787-021-00867-y