ArticleScientific reports2025
Human vaginal Lactobacillus Jensenii -derived (-)-Terpinen-4-ol restores antibiotic sensitivity by inhibiting efflux pumps in drug resistant E. coli and K. pneumoniae.
Article in Scientific reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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Who cites it
8 citing papers in PubMed.
- RL-QN15 accelerates vaginal mucosal repair by regulating inflammatory, autophagic, and apoptotic responses.Biochemistry and biophysics reports · 2026Article
- Comparative Analysis of Chemical Composition and Bioactivities of Volatile Oils FromFood science & nutrition · 2026Article
- Antibacterial mechanisms of terpinen-4-ol against Aeromonas hydrophila.Archives of microbiology · 2026Article
- Bile Salt Hydrolase Activity in the Food-Derived Strain Levilactobacillus brevis M3R3: Genomic and Functional Characterization.Probiotics and antimicrobial proteins · 2026Article
- Probiogenomic and Functional Profiling of the Novel Human Gut-Derived Probiotic StrainJournal of microbiology and biotechnology · 2026Article
- Synergistic antipersister, efflux inhibitory & antibiofilm activities of vaginal Lactobacillus-derived postbiotics against UPEC: toward a novel therapeutic for utis.Scientific reports · 2026Article
- Evaluation of the Quantitative and Structural Antimicrobial Activity of Thymol, Terpinen-4-ol, Citral, and E-2-Dodecenal, Antibiotic Molecules Derived from Essential Oils.Antibiotics (Basel, Switzerland) · 2025Article
- Unraveling the vaginal microbiota-based etiology of recurrent cystitis: the potential role ofTherapeutic advances in urologyReview
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Authors and funding
10 authors.
Funding
Abstract
Probiotics present a promising preventive strategy for addressing urinary tract infections (UTIs) and serve as a viable alternative to conventional antimicrobial treatments. The integration of Lactobacillus-derived efflux pump inhibitors (EPIs) with conventional antibiotics presents a promising strategy to enhance the efficacy of treatments against antibiotic-resistant superbugs. In this study, we isolated eight vaginal Lactobacillus spp. from 54 healthy Indian women to explore their probiotic properties, specifically the ability of cell-free supernatant (CFS) from Lactobacillus jensenii. to inhibit efflux in Multi Drug Resistant (MDR) E. coli and K. pneumoniae. From the CFS, we obtained seven fractions, among which compound 7 (C7) markedly reduced the MIC of erythromycin against the K. pneumoniae MTCC 432 strain by 32-fold from 64 to 2 µg and restored its sensitivity, indicating potent efflux inhibitory activity. Gas Chromatography-Mass Spectrometry (GC-MS) analysis identified one major compound from the C7 fraction as Cyclohexen-1-ol, 4-methyl-1-(1-methylethyl)-, (R)-, also known as (-)-Terpinen-4-ol. In vivo studies using zebrafish infected with clinical strain of K. pneumoniae 1845 followed by treatment with (-)-Terpinen-4-ol and erythromycin caused a significant 7-log reduction in bacterial bioburden. Additionally, time-kill assay demonstrated that the combination of erythromycin with (-)-Terpinen-4-ol caused a remarkable 7-log reduction in both K. pneumoniae, and E. coli cell counts. Furthermore, (-)-Terpinen-4-ol -erythromycin combination exhibited a six-log reduction in bacterial burden in infected T24 bladder cell lines and was found to be non-toxic. This study underscores the efflux inhibitory potential of (-)-Terpinen-4-ol extracted from the CFS of human vaginal probiotics, paving the way for future pharmacological research and therapeutic applications.
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