Related Experiment Video
Updated: Nov 25, 2025
09:15
Two Methods for Establishing Primary Human Endometrial Stromal Cells from Hysterectomy Specimens
Published on: May 23, 2014
23.3K
Streptococcus pyogenes infects human endometrium by limiting the innate immune response
Antonin Weckel1,2, Thomas Guilbert1, Clara Lambert1,2
1Université de Paris, Institut Cochin, INSERM, U1016, CNRS, UMR8104, Paris, France.
The Journal of Clinical Investigation
|December 15, 2020
Summary
Group A Streptococcus (GAS) rapidly invades postpartum tissues and impairs the immune response. This study reveals key mechanisms, including SpeB protease and streptolysin O (SLO), enabling GAS to cause severe puerperal fever infections.
Area of Science:
- Microbiology
- Immunology
- Pathogenesis
Background:
- Group A Streptococcus (GAS) causes significant maternal mortality, particularly through puerperal fever.
- The mechanisms of GAS invasion and immune evasion in postpartum infections remain poorly understood.
- Puerperal fever, a severe postpartum infection, contributes to substantial annual maternal deaths worldwide.
Purpose of the Study:
- To investigate the early invasion mechanisms of GAS in the human decidua.
- To characterize the host immune response during GAS decidual infection.
- To identify GAS virulence factors essential for invasion and immune suppression.
Main Methods:
- Utilized an ex vivo human decidua infection model.
- Analyzed GAS growth, tissue invasion, and host cell killing.
- Assessed immune response at both RNA and protein levels.
- Investigated the roles of SpeB protease and streptolysin O (SLO) in pathogenesis.
Main Results:
- GAS growth was enhanced by decidual tissue products.
- GAS rapidly invaded tissue and caused significant host cell death within 2 hours.
- SpeB protease and SLO were crucial for GAS invasion and cytotoxicity.
- GAS effectively suppressed the innate immune response at both RNA and protein levels, dependent on SpeB and SLO.
Conclusions:
- GAS efficiently invades the decidua, facilitated by SpeB and SLO.
- GAS actively impairs the host immune response, promoting its proliferation.
- These mechanisms contribute to the rapid development of invasive postpartum GAS infections.
