Interleukin-2 receptor beta chain and gamma chain (IL-2Rβ/γ (also written IL-2R beta/gamma); IL2RB and IL2RG individually)

The **interleukin-2 receptor beta and gamma chains** (IL-2Rβ/γ) are two essential subunits of the heterotrimeric interleukin-2 receptor complex found primarily on lymphocytes. Together, the β (CD122) and γ (CD132 or common gamma chain) subunits form a receptor that mediates the biological effects of the cytokine interleukin-2 (IL-2), supporting the proliferation, survival, and differentiation of T cells and natural killer (NK) cells. The gamma chain is shared among several cytokine receptors (including those for IL-4, IL-7, IL-9, IL-15, and IL-21), while the beta chain is more specific to IL-2 and IL-15 receptor signaling. The IL-2Rβ/γ chains are central to immune homeostasis and are involved in both immune activation and tolerance. Mutations in the gamma chain cause X-linked severe combined immunodeficiency (X-SCID), highlighting their critical role in lymphoid development and function. Drugs targeting this receptor complex are used in immunosuppressive regimens for transplantation and under investigation or in use for cancer immunotherapy.

Other names

IL-2Rβ (beta chain, CD122)IL-2Rγ (gamma chain, CD132, common gamma chain)Interleukin-2 receptor subunit betaInterleukin-2 receptor subunit gammaCytokine receptor common subunit gamma (for γ chain)IL2RB (gene/protein symbol for beta)IL2RG (gene/protein symbol for gamma)Common gamma chain

Antagonism of IL-2 signaling by receptor blockade (immunosuppression) Agonism of IL-2Rβ/γ for immune stimulation (T cell proliferation, cancer immunotherapy) Selective biasing of downstream pathway activation (e.g., engineered IL-2 variants for preferential regulatory or effector cell targeting)