article · Antibiotics
Sotolon, a natural aromatic compound responsible for the distinct aroma of fenugreek, displays anti-virulence properties against the resistant pathogen Pseudomonas aeruginosa. When tested at sub-minimum inhibitory concentrations, sotolon suppressed the formation of bacterial biofilms and lowered the production of key virulence factors. Computational modelling demonstrated that sotolon binds to bacterial quorum sensing receptors, which was supported by laboratory findings showing reduced expression of quorum sensing genes. In live animal trials, the compound successfully protected mice against Pseudomonas aeruginosa infection. By weakening the pathogenicity of the bacterium rather than directly killing it, sotolon presents a route to diminish bacterial virulence without creating conventional selective pressures. These results indicate that sotolon holds promise as a natural therapeutic candidate that could serve as an alternative or an adjuvant alongside existing antibiotics to address persistent bacterial infections.
Rising antibiotic resistance poses a critical challenge to treating bacterial illnesses. Conventional treatments often fail against stubborn pathogens such as Pseudomonas aeruginosa, which rely on biofilms and coordinated communication systems to cause disease. By dampening bacterial communication and virulence instead of relying solely on cell death, natural compounds like sotolon offer new avenues to manage difficult infections and enhance the efficacy of existing antibiotic treatments.
The findings could inform the development of adjuvant therapeutics or alternative anti-infective formulations for pharmaceutical developers tackling resistant infections. The research sits at an early, preclinical stage, having demonstrated target binding computationally, in vitro inhibition of virulence mechanisms, and protection in mouse models. Further translational steps, including toxicity assessments, formulation development, and human clinical trials, would be required before therapeutic deployment in healthcare settings.
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The bacterial resistance development due to the incessant administration of antibiotics has led to difficulty in their treatment. Natural adjuvant compounds can be co-administered to hinder the pathogenesis of resistant bacteria. Sotolon is the prevailing aromatic compound that gives fenugreek its typical smell. In the current work, the anti-virulence activities of sotolon on <i>Pseudomonas aeruginosa</i> have been evaluated. <i>P. aeruginosa</i> has been treated with sotolon at sub-minimum inhibitory concentration (MIC), and production of biofilm and other virulence factors were assessed. Moreover, the anti-quorum sensing (QS) activity of sotolon was in-silico evaluated by evaluating the affinity of sotolon to bind to QS receptors, and the expression of QS genes was measured in the presence of sotolon sub-MIC. Furthermore, the sotolon in-vivo capability to protect mice against <i>P. aeruginosa</i> was assessed. Significantly, sotolon decreased the production of bacterial biofilm and virulence factors, the expression of QS genes, and protected mice from <i>P. aeruginosa</i>. Conclusively, the plant natural substance sotolon attenuated the pathogenicity of <i>P. aeruginosa,</i> locating it as a plausible potential therapeutic agent for the treatment of its infections. Sotolon can be used in the treatment of bacterial infections as an alternative or adjuvant to antibiotics to combat their high resistance to antibiotics.
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DOI: 10.3390/antibiotics10070871
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