Glutamine metabolism keeps pathogenic hepatic CD4(+) T cells in check.

Glutamine metabolism through glutaminolysis restrains inflammatory cytokine production by hepatic CD4(+) T cells during MASLD.

• Why it matters: Understanding how metabolic pathways regulate immune cell function can identify targets to prevent liver injury in steatohepatitis.
• What they did: Sawada et al. examined hepatic CD4(+) T cells in MASLD, showing that glutamine metabolism limits O-GlcNAcylation and cytokine production, and that glutamine supplementation restores glutamine levels.
• The result: Findings suggest a tissue-specific metabolic checkpoint that restrains inflammatory T cell activity, with glutamine supplementation potentially reducing liver injury during steatohepatitis.