Regulatory T cell (Treg cell, Tregs)

Regulatory T cells (Tregs) are a specialized subset of CD4+ T lymphocytes essential for maintaining immunological self-tolerance and limiting excessive immune responses. They suppress the activation, proliferation, and function of other immune cells primarily through cell-cell contact mechanisms, release of immunosuppressive cytokines (TGF-β, IL-10), and competitive consumption of survival signals like IL-2. Treg differentiation is governed by expression of the transcription factor FOXP3 and is modulated by environmental cues and cytokines such as TGF-β and IL-2. Recruitment of Tregs into tissues—‘Regulatory T cell recruitment’—is orchestrated by their expression of specific chemokine receptors (e.g., CCR4, CCR8) and by interactions with endothelial adhesion molecules, which are active areas of drug development for immunotherapies. Aberrant Treg frequency, function, or tissue localization is implicated in cancer (promoting immune evasion), autoimmune and inflammatory diseases (insufficient suppression), and aging. Therapies targeting Treg recruitment, expansion, or function are under intense investigation for clinical immunomodulation.

Other names

Regulatory T cellsTregsCD4+CD25+ T cellsFoxp3+ T cells

PRMT5 inhibition: reduces Treg function and tumor infiltration. CTLA-4 blockade: suppresses Treg-mediated immune dampening. Low-dose IL-2: selectively expands Treg cells to restore immune tolerance. Chemokine receptor antagonists: block Treg migration/recruitment into target tissues.