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Igniting antitumour immunity with cancer cell pyroptosis
Xin Liu1,2, Elena Goldberg1,2, Jonathan C Kagan3
1Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA, USA.
Abstract:
Gasdermins (GSDMs) are a family of pore-forming proteins that execute pyroptosis, a lytic form of programmed cell death associated with membrane rupture. This function of GSDMs was initially identified from studies of gasdermin D (GSDMD), which is cleaved and activated by inflammatory caspases in the inflammasome pathway. It is now established that other eukaryotic or pathogen-encoded proteases, as well as post-translational modifications, can also activate GSDM family members independent of inflammasomes and in multiple cell types including cancer cells. T cell granzyme-mediated GSDM activation, exogenous delivery of active GSDMs, and small molecule-induced activation of GSDMs in cancer cells have been shown to promote antitumour immunity through pyroptosis. Notably, only a fraction of cancer cells needs to undergo pyroptosis to induce immune cell infiltration and antitumour immunity with tolerable toxicity. Here, we summarize current knowledge on the role of pyroptosis in antitumour immunity, discuss pyroptosis in the context of other lytic forms of cell death, and provide an outlook on how cancer cell pyroptosis may synergize with existing immunotherapies.
Insights
Gasdermins (GSDMs) trigger pyroptosis, a cell death process that can promote anti-tumor immunity. Activating GSDMs in cancer cells can enhance immune responses with manageable side effects.
Area of Science:
- Immunology
- Cell Biology
- Oncology
Background:
- Gasdermins (GSDMs) are pore-forming proteins central to pyroptosis, a lytic programmed cell death.
- GSDMD activation by inflammasomes is a canonical pathway, but GSDMs can be activated by other proteases and modifications.
- Pyroptosis induction in cancer cells shows potential for anti-tumor immunity.
Purpose of the Study:
- To review the role of pyroptosis in anti-tumor immunity.
- To compare pyroptosis with other lytic cell death forms.
- To explore the synergy of cancer cell pyroptosis with current immunotherapies.
Main Methods:
- Literature review and synthesis of current knowledge on GSDMs and pyroptosis.
- Analysis of studies involving GSDM activation in cancer cells.
- Discussion of pyroptosis in relation to other cell death mechanisms.
Main Results:
- GSDM activation, independent of inflammasomes, occurs in various cell types, including cancer cells.
- GSDM activation via T cell granzymes, exogenous delivery, or small molecules promotes anti-tumor immunity.
- Limited pyroptosis in cancer cells can elicit significant immune infiltration and anti-tumor effects with acceptable toxicity.
Conclusions:
- Pyroptosis is a promising mechanism for enhancing anti-tumor immunity.
- Targeting cancer cell pyroptosis may synergize with existing immunotherapies for improved cancer treatment.
- Further research into pyroptosis modulation holds potential for novel cancer therapies.
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