From:  Nutrient-driven immunometabolism in metabolic disease

 Metabolic programming of major immune cell subsets.

Immune cell and statePrimary metabolic pathway(s)Key metabolic regulatorsFunctional rationale
Naïve T CellOXPHOS, FAO [49]AMPK [69]Long-term survival in circulation; energy efficiency.
Activated effector T Cell (Th1, Th17, CD8+)Aerobic glycolysis, glutaminolysis [41, 70]mTOR, HIF-1α [71]Rapid ATP and biomass for clonal expansion and cytokine production.
TregOXPHOS, FAO [69]AMPK, PPARγ [72]Suppressive function; metabolic flexibility for tissue homeostasis.
Memory T CellOXPHOS, FAO [49]AMPK, PGC-1α [73]Long-term persistence and rapid recall upon reactivation.
M1 MacrophageAerobic glycolysis, PPP [64]HIF-1α, mTOR [74]Bactericidal activity; pro-inflammatory cytokine (IL-1β, TNF-α) production.
M2 MacrophageOXPHOS, FAO [75]AMPK, PPARγ [76]Tissue repair, wound healing, and anti-inflammatory resolution.
Resting DCOXPHOS, FAO [77]AMPKImmune surveillance; maintenance of tissue tolerance.
Activated DCAerobic glycolysis [77]HIF-1α, mTORAntigen presentation, co-stimulation, and cytokine secretion.

AMPK: AMP-activated protein kinase; DC: dendritic cell; FAO: fatty acid oxidation; HIF: hypoxia-inducible factor; mTOR: mechanistic target of rapamycin; OXPHOS: oxidative phosphorylation; PGC-1α: peroxisome proliferator-activated receptor gamma coactivator 1-alpha; PPARγ: peroxisome proliferator-activated receptor gamma; PPP: pentose phosphate pathway; Treg: regulatory T cell.