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Forward Genetic Approaches in Chlamydia trachomatis
Published on: October 23, 2013
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Lactobacilli inactivate Chlamydia trachomatis through lactic acid but not H2O2
Zheng Gong1, Yesmin Luna2, Ping Yu3
1Department of Pharmacology, Rutgers University Robert Wood Johnson Medical School, Piscataway, New Jersey, United States of America; Department of Immunology, Central South University Xiangya Medical School, Changsha, Hunan, China.
Plos One
|September 13, 2014
Summary
Lactobacilli kill Chlamydia trachomatis primarily through lactic acid production in the low-oxygen vaginal environment. Lowering vaginal pH may reduce susceptibility to this common sexually transmitted infection.
Area of Science:
- Microbiology
- Gynecology
- Infectious Diseases
Background:
- Lactobacillus species are key to vaginal health, producing lactic acid and hydrogen peroxide (H2O2) to inhibit pathogens.
- Chlamydia trachomatis is a major sexually transmitted bacterium, but its interaction with vaginal lactobacilli is poorly understood.
Purpose of the Study:
- To investigate how vaginal lactobacilli, specifically Lactobacillus crispatus, L. gasseri, and L. jensenii, affect Chlamydia trachomatis infectivity.
- To determine the mechanisms by which lactobacilli inhibit C. trachomatis growth.
Main Methods:
- Cultured C. trachomatis with media conditioned by Lactobacillus species.
- Measured pH and acid concentrations (lactic, formic, acetic acid) in conditioned media.
- Assessed the impact of pH neutralization and H2O2 on C. trachomatis inactivation.
- Compared chlamydiacidal activity under aerobic and anaerobic conditions.
Main Results:
- Media conditioned by L. crispatus, L. gasseri, and L. jensenii inactivated C. trachomatis infectivity.
- Lactic acid production was the primary mechanism, with acidity directly correlating to C. trachomatis killing.
- H2O2 was insufficient for inactivation; increased aeration reduced lactobacilli growth and acidification, impairing C. trachomatis killing.
- Formic and acetic acids also demonstrated chlamydiacidal activity.
Conclusions:
- Vaginal lactobacilli primarily inhibit C. trachomatis via lactic acid production in a low-oxygen environment.
- Maintaining a low vaginal pH is crucial for preventing C. trachomatis infection.
- Strategies to lower vaginal pH could reduce susceptibility to C. trachomatis.
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