Abstract
Pseudomonas aeruginosa is a critical priority organism by the WHO, due to its virulence factors which are controlled by quorum sensing (QS). The QS is regulated through specifics subsystems: LasI/LasR, RhlI/RhlR and PQS/MvfR. Several natural compounds have demonstrated inhibition effects against QS subsystems. The objective of this study was to determinate the effect of the curcumin, reserpine and its mixtures with two commercial antibiotics against the QS of P. aeruginosa. The MIC was calculated by microdilution method. The effect of curcumin, reserpine, antibiotics and its mixtures, were performed by RT-PCR of mvfR and assessed by a semi-quantitative method. Curcumin, reserpine and gentamicin alone had better inhibition against mvfR gene than azithromycin. The mixtures that had the best inhibition against QS were curcumin-gentamicin and reserpine-gentamicin, determining a synergistic effect against QS regulation gen, also evidenced in pyocyanin and rhamnolipids productions decrease because of these mixtures. Our results demonstrate that synergy between natural compounds and antibiotics is existing, specially between curcumin-gentamicin and reserpine-gentamicin, which leads to develop different alternatives treatments to complement, replace or enhance conventional methods currently used against P. aeruginosa.
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