Purin Metabolism Is Crucial for Regulatory T Cell Stability and Function.

Cellular metabolism intricately directs the differentiation, stability, and function of regulatory T cells (Tregs), which are pivotal in immune regulation. Metabolic reprogramming enables Tregs to adapt to diverse tissue environments; however, it can also disturb immune equilibrium, driving their conversion into unfavorable states like exTregs that hinder regulation in autoimmunity and transplantation. Purine metabolism has emerged as a critical but underexplored regulator of Treg biology. Beyond their traditional roles in nucleotide synthesis and energy balance, purine metabolites also serve as potent second messengers shaping Treg phenotype, suppressive capacity, and adaptability in inflammatory, autoimmune, and transplant environments. Extracellular ATP promotes inflammation, while adenosine supports Treg-mediated immunosuppression, highlighting a dual and context-dependent nature of purinergic signaling. This review outlines current findings on intracellular and extracellular purine metabolism in Tregs, emphasizing key enzymes and purinergic receptors that sustain Treg phenotype and resilience. It discusses disruptions in purine signaling compromising Treg functions, identifies knowledge gaps, and proposes future research directions for potential therapeutic strategies in immune-related ailments.