Antibacterial Activity ofStrains Isolated from Mongolian Yogurt against.
Biomed Res Int. 2020 ;2020:3548618. Epub 2020 Apr 22. PMID: 32382546
Worldwide interest in the use of functional foods containing probiotic bacteria such asandfor health promotion and disease prevention has increased significantly. Probiotics have demonstrated beneficial properties including strengthening the body's natural defense system, inhibiting the growth of pathogenic bacteria, and regulating mental activity, but their effects on the human vagina have not been fully elucidated. The primary purpose of our study was to isolatestrains from old yogurt, a traditional dairy product, and investigate their probiotic potential with respect to the human vaginal system. Four() strains, named ZX1, ZX2, ZX27, and ZX69, were isolated from the yogurt samples. Simultaneously, we used a commercialstrain (DM8909) as a control strain. We tested the antimicrobial activity ofisolates againstandby agar spot and well diffusion tests. Then, we tested the antibiotic susceptibility of the 5 strains by using the minimal inhibitory concentration method. We attempted to detect possible bacteriocin genes by PCR sequencing technique. Using a chemically defined medium simulating genital tract secretions, we found that the selectedstrains could alter the expression of known virulence genes inBacteriocins derived from these isolated strains had potent antibacterial activity against.and., with the most effective activity observed in the case of ZX27. In addition, all strains including the.DM8909 were positive for the presence of the plantaricin cluster of genes described in.C11. The tested stains possessed thegene indicating that one of the antibacterial agents was plantaricin. We assume that the production of antimicrobial substances such as bacteriocins induceto upregulate antimicrobial resistance genes. The new isolated strains have bacteriocin-related genes and can change the antimicrobial resistance gene transcription of..