Dichotomous metabolic networks govern human ILC2 proliferation and function

Area of Science:

• Immunology
• Cellular Metabolism

Background:

• Group 2 innate lymphoid cells (ILC2s) are crucial for immune defense and tissue repair, producing type 2 cytokines.
• Human ILC2 metabolism remains poorly understood, unlike that of T lymphocytes.

Discussion:

• Naive human ILC2s exhibit higher oxidative phosphorylation (OXPHOS) than natural killer (NK) cells.
• ILC2s are reduced in individuals with mitochondrial disease, indicating reliance on OXPHOS.
• Metabolomic analysis shows ILC2s use amino acids to sustain OXPHOS.

Key Insights:

• Activated ILC2s uncouple proliferation from function, using glycolysis for proliferation and OXPHOS for fitness.
• Interleukin-33 (IL-33) activation induces reliance on glycolysis and mTOR pathway.
• Amino acid uptake fuels OXPHOS, supporting ILC2 proliferation and cellular health.

Outlook:

• Understanding ILC2 metabolic plasticity offers novel therapeutic targets for immune-related diseases.
• Targeting ILC2 metabolism could modulate immune responses in various pathological conditions.