Related Experiment Video
Updated: Jan 2, 2026
06:09
Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells
Published on: June 7, 2019
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Mutant BRAF and MEK Inhibitors Regulate the Tumor Immune Microenvironment via Pyroptosis
Dan A Erkes1, Weijia Cai1, Ileine M Sanchez1
1Department of Cancer Biology, Thomas Jefferson University, Philadelphia, Pennsylvania.
Cancer Discovery
|December 5, 2019
Summary
BRAF and MEK inhibitors induce melanoma cell death via pyroptosis, a form of programmed cell death. This pyroptosis is crucial for immune responses against melanoma and offers new treatment strategies for resistant tumors.
Area of Science:
- Oncology
- Immunology
- Cell Biology
Background:
- BRAF inhibitors + MEK inhibitors (BRAFi + MEKi) treat BRAF-mutant melanoma.
- Their efficacy links to cell death and immune microenvironment changes, but mechanisms are unclear.
Purpose of the Study:
- Investigate the role of pyroptosis in BRAFi + MEKi efficacy for melanoma.
- Explore therapeutic strategies for BRAFi + MEKi-resistant melanoma.
Main Methods:
- Studied BRAFi + MEKi treatment in melanoma models.
- Assessed markers of pyroptosis (GSDME cleavage, HMGB1 release).
- Analyzed immune cell infiltrates (T cells, dendritic cells) and tumor regrowth.
Main Results:
- BRAFi + MEKi induced pyroptosis, marked by GSDME cleavage and HMGB1 release.
- GSDME deficiency impaired immune response and led to tumor regrowth.
- Resistant melanoma lacked pyroptosis and T cells but responded to pyroptosis-inducing chemotherapy.
Conclusions:
- BRAFi + MEKi-induced pyroptosis drives antitumor immune responses in melanoma.
- Targeting pyroptosis is a potential strategy for BRAFi + MEKi-resistant melanoma.
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