TY - JOUR ID - 10743 TI - Anti-virulence potential of eugenol-rich fraction of Syzygium aromaticum against multidrug resistant uropathogens isolated from catheterized patients JO - Avicenna Journal of Phytomedicine JA - AJP LA - en SN - 2228-7930 AU - Prasanth, Rathinam AU - Viswanathan, Pragasam AD - Renal Research Lab, Centre for Bio Medical Research, School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore, India Y1 - 2018 PY - 2018 VL - 8 IS - 5 SP - 416 EP - 431 KW - Syzygium aromaticum (L.) KW - Anti-virulence agent KW - Quorum sensing KW - Eugenol KW - Pseudomonas aeruginosa KW - CAUTIs DO - 10.22038/ajp.2018.23171.1860 N2 - Objective: Considering the emergence of biofilm-associated pathogens with multidrug resistance, the objective(s) of the present study was to evaluate the anti-virulence property of Syzygium aromaticum extracts/fractions against 2 multidrug-resistant catheter isolates. Materials and Methods: Pulverized clove buds were subjected to bioactivity-guided isolation to identify the bioactive extract/fraction(s) with significant anti-virulence property. The clove bud powder was subjected to Soxhlet extraction and all these extracts were investigated in terms of anti-virulent efficacy using initial readout assays. Bioassay-guided partial purification was performed through column and size exclusion chromatography. Detailed testing of the anti-virulence and anti-biofilm activity of sub-minimum inhibitory concentration (sub-MIC) levels of the active fraction, was performed besides the cytotoxicity profiling in RAW 264.7 cells. Results: Gas chromatography-mass spectrometry (GC-MS) analysis of the clove bioactive fraction-2 (CBF-2), done after the bioassay-guided fractionation, revealed eugenol as the major bioactive ingredient present in CBF-2. Reduced mRNA levels of virulence factor genes after CBF-2 (700 μg/ml) treatment correlated well with the respective phenotypic assays (p<0.001). Similarly, CBF-2 (700 μg/ml) treatment exhibited significantly low mRNA levels of quorum sensing (QS) receptor genes compared to their cognate synthase genes (p<0.001). Crystal violet staining and scanning electron micrographs of CBF-2-treated biofilms showed lesser macrocolonies with remarkably simplified architecture. Cytotoxic evaluation of CBF-2 suggested a minute reduction in viability even at the highest tested concentration (1600 μg/ml, p<0.05). Conclusion: The present study indicated that eugenol-rich CBF-2 has potent anti-virulence and anti-biofilm activity against urinary catheter isolates and can be regarded as an alternative for treatment of catheter-associated urinary tract infections. UR - https://ajp.mums.ac.ir/article_10743.html L1 - https://ajp.mums.ac.ir/article_10743_a766895d48135833ed85542e543a981f.pdf ER -