Abstract
Bacterial vaginosis (BV) is a common vaginal disease associated with abnormal changes in the vaginal microbiome. Our previous study found that Lactobacillus rhamnosus has a good therapeutic effect on bacterial vaginosis by inhibiting the most prominent bacterium associated with BV, Gardnerella vaginalis. In this study, we show that acetic acid and lactic acid are the main substances in the cell-free supernatant (CFS) of L. rhamnosus that inhibit the growth of G. vaginalis. Further study on the mechanism showed that acetic acid and lactic acid alter the morphology of the G. vaginalis cells, eventually causing the cells to shrink or burst, resulting in exudation of their intracellular contents. In addition, these two organic acids also dissipate the membrane potential of bacterial cells, affecting their synthesis of ATP. A reduced activity of the Na+/K+-ATPase leads to abnormal ATP metabolism, and ultimately inhibits the growth and reproduction of G. vaginalis. Our study provides valuable information for the widespread application of L. rhamnosus in the treatment of bacterial vaginosis.
Original language | English |
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Pages (from-to) | 400-410 |
Journal | Probiotics and Antimicrobial Proteins |
Volume | 15 |
Issue number | 2 |
DOIs | |
Publication status | Published - Apr 2023 |
MoE publication type | A1 Journal article-refereed |
Funding
This work was supported by the National Natural Science Foundation of China (32072184 to BBZ), the Research Start-up Foundation of Shantou University (NTF20003 to BBZ and NTF22003 to QQY), the “Six Talent Peak” Plan of Jiangsu Province (SWYY-211 to BBZ), and VTT Technical Research Centre of Finland (to IM).
Keywords
- Antimicrobial mechanisms
- Antimicrobial substances
- Bacterial vaginosis
- Gardnerella vaginalis
- Lactobacillus rhamnosus