Related Experiment Video
Updated: Sep 27, 2025
05:14
Author Spotlight: Flow Cytometric Determination of Pyroptosis in Avian Cells
Published on: May 31, 2024
1.5K
Streptococcus makes the cut: Gasdermin A-induced pyroptosis
Anyang Zhao1, Max Kirkby1, Si Ming Man1
1Division of Immunity, Inflammation, and Infection, The John Curtin School of Medical Research, The Australian National University, Canberra, Australia.
Cell Host & Microbe
|April 14, 2022
Summary
Streptococcus pyogenes SpeB protease activates Gasdermin A, a cell death protein, triggering pyroptosis in skin cells. This finding reveals a direct mechanism for pathogen-induced cell death.
Area of Science:
- Molecular Biology
- Cell Biology
- Pathogen-Infectious Disease
Background:
- Gasdermin proteins are key executors of programmed cell death.
- Activation of gasdermins involves cleavage by specific proteases.
- The precise mechanisms of gasdermin activation by pathogens are not fully understood.
Purpose of the Study:
- To investigate the direct interaction between Streptococcus pyogenes cysteine protease SpeB and Gasdermin A.
- To elucidate the role of SpeB in Gasdermin A activation and pyroptosis induction.
- To understand the implications of this interaction in skin cell infection.
Main Methods:
- In vitro protease assays to assess SpeB activity on Gasdermin A.
- Cell-based assays using human skin cells to observe pyroptosis.
- Microscopy and biochemical techniques to confirm Gasdermin A cleavage and activation.
Main Results:
- The cysteine protease SpeB from Streptococcus pyogenes directly cleaves Gasdermin A.
- SpeB-mediated cleavage of Gasdermin A leads to its activation.
- Activated Gasdermin A induces pyroptosis in human skin cells.
Conclusions:
- Streptococcus pyogenes SpeB directly activates Gasdermin A, a critical step in pyroptosis.
- This provides a direct molecular mechanism by which this pathogen induces cell death.
- Understanding this interaction is crucial for developing strategies against Streptococcus pyogenes infections.
