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Microorganisms, Vol. 12, Pages 1392: Anti-Leishmania amazonensis Activity of Morolic Acid, a Pentacyclic Triterpene with Effects on Innate Immune Response during Macrophage Infection
Microorganisms doi: 10.3390/microorganisms12071392
Authors: Vanessa Maria Rodrigues de Souza Nicolle Barreira Maciel Yasmim Alves Aires Machado Julyanne Maria Saraiva de Sousa Raiza Raianne Luz Rodrigues Airton Lucas Sousa dos Santos Maria Gabrielly Gonçalves da Silva Ingrid Gracielle Martins da Silva Karine Brenda Barros-Cordeiro Sônia Nair Báo Josean Fechine Tavares Klinger Antonio da Franca Rodrigues
Leishmaniasis is a group of infectious diseases transmitted to humans during vector bites and caused by protozoans of the genus Leishmania. Conventional therapies face challenges due to their serious side effects, prompting research into new anti-leishmania agents. In this context, we investigated the effectiveness of morolic acid, a pentacyclic triterpene, on L. amazonensis promastigotes and amastigotes. The present study employed the MTT assay, cytokine analysis using optEIATM kits, an H2DCFDA test, and nitric oxide dosage involving nitrite production and Griess reagent. Morolic acid inhibited promastigote and axenic amastigote growth forms at IC50 values of 1.13 µM and 2.74 µM, respectively. For cytotoxicity to macrophages and VERO cells, morolic acid obtained respective CC50 values of 68.61 µM and 82.94 µM. The compound causes damage to the parasite membrane, leading to cellular leakage. In the infection assay, there was a decrease in parasite load, resulting in a CI50 of 2.56 µM. This effect was associated with immunomodulatory activity, altering macrophage structural and cellular parasite elimination mechanisms. Morolic acid proved to be an effective and selective natural compound, making it a strong candidate for future in vivo studies in cutaneous leishmaniasis.
