Mouse Memory CD8 T Cell Subsets Defined by Tissue-Resident Memory Integrin Expression Exhibit Distinct Metabolic...

Area of Science:

• Immunology
• Cell Metabolism
• Systems Biology

Background:

• Tissue-resident memory CD8 T cells (TRM) are crucial for immunity in non-lymphoid tissues like the lung.
• TRM subsets exhibit functional and gene expression heterogeneity, potentially linked to distinct metabolic pathways.

Purpose of the Study:

• To investigate if lung TRM subsets, defined by integrin profiles, utilize unique metabolic programs.
• To explore the impact of nutrient availability on TRM differentiation and function.

Main Methods:

• Differential gene expression and pathway analysis of RNA sequencing data from mouse lung TRMs.
• Construction and validation of metabolic models using metabolite uptake assays.
• Measurement of oxidative phosphorylation, mitochondrial mass, and neutral lipids.
• In vitro T cell differentiation studies under varying metabolite concentrations.

Main Results:

• Significant metabolic pathway differences were identified among lung TRM subsets.
• Lipid availability affects T cell survival, while glucose concentration influences the expression of the TRM marker CD49a.
• Nutrient abundance was shown to alter T cell differentiation.

Conclusions:

• Lung TRM subsets defined by integrin expression possess distinct metabolic profiles.
• Metabolic plasticity and nutrient availability play a significant role in TRM differentiation and function.