article · Antioxidants
Rising drug resistance has reduced the effectiveness of traditional antibiotics, prompting interest in natural plant-derived compounds. Research into 1,8-cineol, also known as eucalyptol and found in various essential oils, reveals antibacterial activity against both clinical and reference strains of methicillin-resistant Staphylococcus aureus (MRSA). Laboratory assessments established a minimum inhibitory concentration of 7.23 mg/mL. The compound compromises bacterial membrane integrity, resulting in altered surface charge and a 5.36-fold increase in the leakage of nucleic acids and proteins compared to untreated bacteria. Furthermore, 1,8-cineol triggers lethal oxidative stress within the cells, marked by sharp rises in reactive oxygen species and lipid peroxidation, alongside a decrease in protective antioxidant enzyme activities. These combined actions disrupt cell structure and drive bacterial death.
Drug-resistant pathogens like MRSA present serious clinical concerns as conventional antibiotics lose their potency. Identifying alternative compounds from natural sources helps clarify new methods for eliminating resilient bacteria. By demonstrating that eucalyptol simultaneously breaks down cell membranes and generates damaging internal oxidative stress, this work highlights viable mechanisms for targeting bacteria that have developed resistance to standard treatments.
This research is at an early laboratory stage, having established in vitro mechanisms against bacterial cultures. The findings could inform the development of natural antibacterial formulations, antiseptics, or combination therapies by pharmaceutical and healthcare product developers. Practical deployment remains distant, as subsequent formulation design, safety profiling, and clinical testing are required before any real-world healthcare use can be achieved.
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Due to the increased emergence of drug-resistant bacteria, the declining efficiency of traditional antimicrobials has generated severe concerns in recent years. Subsequently, more interest in other antimicrobial agents from natural resources draws more attention as an alternative to conventional medications. This study investigated the bactericidal mechanism of monoterpene 1,8-cineol (eucalyptol), a major compound of various essential oils, against methicillin-resistant Staphylococcus aureus (MRSA). The antibacterial activity of 1,8-cineol was assessed by an MTT assay against clinical and reference MRSA strains. A cell membrane integrity test, followed by zeta potential (ZP) measurements, was performed to evaluate the disruption of the bacterial membrane integrity. Additionally, the cytotoxic effect of this molecule on MRSA bacteria was investigated by monitoring reactive oxygen species (ROS) generation, lipid peroxidation (MDA), and antioxidant enzyme activities (CAT and SOD). Regarding the anti-staphylococcal effect, the obtained results revealed the antibacterial efficacy of 1,8-cineol wherein the minimum inhibitory concentrations were equal to 7.23 mg/mL. Furthermore, it enhanced membrane permeability, with a 5.36-fold increase in nucleic acid and protein leakage as compared with untreated strains, along with the alteration of surface charge (ZP) in MRSA cells. The tested compound caused an increase in ROS generation reaching 17,462 FU and MDA production, reaching 9.56 μM/mg protein, in treated bacterial cells, along with a decrease in oxidative stress enzymes activities. Our findings suggest that 1,8-cineol has the ability to damage the membrane integrity and induce ROS-mediated oxidative stress in MRSA cells, leading to its antagonistic effect against this pathogen and consequently aiding in the reversal of antibiotic resistance.
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DOI: 10.3390/antiox12071388
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