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KMID : 1161420210240090934
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Journal of Medicinal Food
2021 Volume.24 No. 9 p.934 ~ p.943
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Antivirulence Activity of a Dietary Phytochemical: Hibiscus Acid Isolated from Hibiscus sabdariffa L. Reduces the Virulence of Pseudomonas aeruginosa in a Mouse Infection Model
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Cortes-Lopez Humberto
Castro-Rosas Javier
Garcia-Contreras Rodolfo
Rodriguez-Zavala Jose Salud
Gonzalez-Pedrajo Bertha
Diaz-Guerrero Miguel
Hernandez-Morales Javier
Munoz-Cazares Naybi
Soto-Hernandez Marcos
del Mar Ruiz-Posadas Lucero
Castillo-Juarez Israel
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Abstract
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Hibiscus sabdariffa L. (Hs) calyxes, rich in organic acids, are included in diets in different countries. In recent years, some phytochemicals have been shown to reduce bacterial virulence at sublethal concentrations by interfering with quorum sensing (QS) systems. Therefore, in this study the antivirulence properties of Hs calyxes and two γ-lactones (hibiscus acid [HA] and its methyl ester) in Pseudomonas aeruginosa were analyzed. Acetone and methanol extracts of Hs showed anti-QS activity by inhibiting violacein production (60% to 80% with 250?μg/mL). In molecular docking analysis, the γ-lactones registered a good binding score, which suggests strong interaction with the active site of LasR protein. To verify their effect in vitro, they were isolated from Hs and evaluated in six QS-regulated phenotypes, as well as in ExoU toxin that is released by the type III secretion system (T3SS). At 500?μg/mL they reduced alkaline protease (29?52%) and elastase (15?37%) activity, biofilm formation (∼75%), and swarming (50%), but there was no effect on pyocyanin production, hemolytic activity, or type III secretion. In a mouse abscess/necrosis model, HA at sublethal concentrations (15 and 31.2?μg/mL) affected infection establishment and prevented damage and systemic spread. In conclusion, HA is the first molecule identified with antivirulence properties in Hs with the potential to prevent infections caused by P. aeruginosa.
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KEYWORD
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animal model, antivirulence activity, hibiscus acid, quorum quenching, swarming motility, type III secretion system
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