Cancer competition for vitamin B2 creates metabolic checkpoint for T cell ferroptosis.

Tumor-driven vitamin B2 competition creates a metabolic checkpoint that induces T cell ferroptosis, with SLC52A2 mediating tumor scavenging and SLC52A3 essential for T cell immunity.

• Why it matters: Understanding how metabolic competition impairs T cell function is crucial for improving cancer immunotherapy, as tumors outcompete immune cells for vital nutrients like vitamin B2.
• What they did: Using the CareSLCs platform, the study identified SLC52A3 as key for T cell vitamin B2 uptake, while tumors preferentially use SLC52A2 to scavenge VB2, with experiments involving gene ablation and dietary supplementation.
• The result: Enhancing VB2 uptake through supplementation or SLC52A3 overexpression boosts CAR-T cell efficacy, suggesting targeting vitamin B2 transport can reinvigorate T cells and improve cancer treatment outcomes.