Cystine Restriction Alleviates T-cell Exhaustion and Enhances CAR T-cell Potency.

Cystine restriction alleviates CD8+ T cell exhaustion and enhances CAR T-cell efficacy by targeting SLC7A11 in solid tumors.

• Why it matters: T-cell exhaustion limits the success of CAR T-cell therapy in solid tumors, and understanding metabolic regulation of exhaustion could improve treatment outcomes.
• What they did: The study used RNA sequencing, monoclonal antibody development, and functional assays to show that inhibiting SLC7A11 promotes CD8+ stem-like memory T cell expansion and reduces exhaustion, with in vivo treatment improving CAR T-cell antitumor activity.
• The result: Inhibition of SLC7A11 suppressed cystine uptake, activated the GCN2-eIF2α-SLC1A5 signaling axis, and supported mitochondrial fitness, suggesting cystine restriction can boost CAR T-cell therapy effectiveness.