Antigen Priming Induces Functional Reprogramming in iNKT Cells via Metabolic and Epigenetic Regulation: An Insight...

Area of Science:

• Immunology
• Cellular Metabolism
• Cancer Biology

Background:

• Invariant natural killer T (iNKT) cells are crucial for antitumor immunity.
• Dysfunctional iNKT cells within tumors limit their therapeutic potential.
• Mechanisms linking antigen priming to iNKT cell function remain unclear.

Purpose of the Study:

• To investigate how antigen priming influences iNKT cell metabolism and function.
• To explore the role of metabolic reprogramming and epigenetic remodeling in iNKT cell dysfunction.
• To identify strategies for enhancing iNKT cell-based antitumor immunotherapy.

Main Methods:

• Analysis of metabolic reprogramming (oxidative phosphorylation, glycolysis) in antigen-primed iNKT cells.
• Assessment of epigenetic remodeling and gene expression (granzymes).
• Evaluation of iNKT cell cytotoxicity and cytokine production.
• In vivo studies using ZLN005 to restore iNKT cell function in tumors.

Main Results:

• Antigen priming induces metabolic reprogramming, characterized by impaired oxidative phosphorylation (OXPHOS) and elevated glycolysis.
• This metabolic shift reduces T-cell receptor signaling and mTORC1 activation, leading to limited cytokine responses.
• Epigenetic remodeling, not metabolic changes, drives enhanced granzyme expression and cytotoxicity.
• Intratumoral iNKT cells exhibit similar reprogramming, and ZLN005 treatment restores OXPHOS and enhances antitumor responses.

Conclusions:

• Antigen priming causes functional reprogramming of iNKT cells via metabolic and epigenetic alterations.
• Impaired OXPHOS limits cytokine production, while epigenetic changes enhance cytotoxicity.
• Restoring OXPHOS in intratumoral iNKT cells is a promising strategy for cancer immunotherapy.