Plant compound quiets bacterial chatter to fight lung infections
Grine N, Jlidi H, Amarni M, Frikha F, Aifa S
Medicinal Plants
The same plant chemistry that gives pine forests and herb gardens their scent is showing up as a lead ingredient in next-generation infection fighters, a reminder that the compounds in ordinary plants often do more than smell good.
Pseudomonas bacteria, a common cause of drug-resistant lung infections, coordinate their attacks by 'talking' to each other using chemical signals. Researchers found that verbenol, a compound naturally made by plants, jams that communication system so the bacteria can't organize biofilms, toxins, or the ability to swim toward host tissue. In mice, this calmed lung infections and inflammation without the toxic side effects that come from trying to kill the bacteria outright.
Key Findings
Sub-inhibitory doses of verbenol disrupted bacterial adhesion, destroyed pre-formed biofilms, and blocked flagellar/pili motility despite a weak direct-kill effect (MIC = 6.25 mg/mL)
In a mouse lung infection model, verbenol reduced pneumonia-associated tissue damage, restored redox balance, and lowered pro-inflammatory cytokines IL-6 and TNF-α with no detectable systemic toxicity
Molecular docking and 200 ns simulations showed verbenol binds simultaneously to three quorum-sensing regulators (LasR, RhlR, PqsR) with low entropic penalty, acting as a 'pan-inhibitor' of bacterial communication
chevron_right Technical Summary
Scientists found that verbenol, a compound from plants, can disarm a dangerous drug-resistant lung bacterium by jamming its chemical communication system instead of trying to kill it outright, reducing infection severity in mice without harmful side effects.
Abstract Preview
Original paper
Verbenol acts as a low-entropy pan-inhibitor of quorum sensing to attenuate Pseudomonas aeruginosa virulence and resolve pulmonary inflammation.
The rise of multidrug-resistant Pseudomonas aeruginosa necessitates urgent anti-virulence strategies designed to disarm pathogens without driving selective resistance. Here, we present an integrate...
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Verbena, also known as vervain or verveine, is a genus in the family Verbenaceae. It contains about 150 species of annual and perennial herbaceous or semi-woody flowering plants. The majority of the species are native to the Americas and Asia; however, Verbena officinalis, the common vervain or c...