Regulatory T cell (Treg)

Regulatory T-cell mediated immunosuppression refers to the collective mechanisms by which regulatory T cells (Tregs) suppress immune responses. **Tregs** are a specialized subset of CD4+ lymphocytes characterized by high expression of FOXP3 and CD25. They maintain immune homeostasis and self-tolerance by inhibiting the activation and proliferation of effector immune cells such as conventional CD4+ and CD8+ T cells, NK cells, NKT cells, and antigen-presenting cells. Their suppressive functions are executed through multiple mechanisms including secretion of anti-inflammatory cytokines like interleukin 10 (IL‑10), transforming growth factor beta (TGF‑β), and interleukin 35; metabolic disruption via consumption of IL‑2 or generation of adenosine through ectoenzymes like CD39/CD73; cytolytic activity using granzyme/perforin pathways; modulation of dendritic cell function; and engagement with inhibitory receptors such as CTLA‑4. Dysregulated or deficient regulatory T-cell activity is implicated in autoimmune diseases due to loss of tolerance but can also contribute to cancer progression by dampening anti-tumor immunity[1][3][5][7]. **Note:** "Regulatory T-cell mediated immunosuppression" is not itself a molecular target but rather describes the functional outcome produced by regulatory T cells—a heterogeneous population defined at the cellular level rather than as an individual protein/receptor/targetable entity. Therefore: *is_target*: false — it is not considered a canonical therapeutic target in the sense used for drug discovery. *is_incorrect*: true — this entry does not refer to a specific molecule/receptor/enzyme/transporter but instead describes an entire biological process carried out by a class of immune cells. For structured data purposes, you should map queries about "regulatory T-cell mediated immunosuppression" to **Regulatory T cell** ("Treg") as the canonical form when possible.

Other names

Regulatory T lymphocytesuppressor T cellCD4+CD25+FOXP3+ T cellTreg cell

- Secretion of inhibitory cytokines (e.g., IL-10, TGF-beta, IL-35)[1][3][5] - Expression of inhibitory receptors (e.g., CTLA4, PD1)[5][7] - Metabolic disruption via CD39/CD73-mediated adenosine production[7]