Targeting methionine-induced pyroptosis enhances anti-tumor immunity

Area of Science:

• Immunology
• Metabolic pathways
• Cancer research

Background:

• Pyroptosis, an inflammatory cell death, is vital in tumor immunity.
• The metabolic regulators of pyroptosis are not fully understood.
• Methionine metabolism's role in pyroptosis is unexplored.

Purpose of the Study:

• To investigate the role of methionine metabolism in pyroptosis.
• To identify metabolic targets for modulating pyroptosis in cancer.

Main Methods:

• Utilized bone marrow-derived macrophages (BMDMs) to study pyroptosis.
• Investigated the effects of methionine adenosyltransferase 2A (Mat2a) depletion and inhibition.
• Assessed the impact of 1,2,3,4,6-O-pentagalloylglucose (PGG) on MAT2A activity and degradation.
• Evaluated pyroptosis induction via Gasdermin E (GSDME) and Gasdermin D (GSDMD) activation.
• Examined tumor growth suppression and anti-tumor immune response in vivo.

Main Results:

• Mat2a depletion in BMDMs induced pyroptosis by activating GSDME, suppressing tumor growth.
• Pharmacological inhibition of MAT2A triggered macrophage pyroptosis via GSDME, not GSDMD.
• The natural compound PGG inhibited MAT2A activity and promoted its degradation.
• PGG induced pyroptosis by cleaving GSDME in tumor cells, enhancing anti-tumor immunity.

Conclusions:

• Methionine metabolism, specifically MAT2A, is a key regulator of pyroptosis.
• Targeting MAT2A with PGG shows potential for cancer therapy by inducing pyroptosis and boosting anti-tumor immunity.