Interleukin-2 receptor beta chain and Interleukin-2 receptor gamma chain (IL-2Rβ (for beta), IL-2Rγ (for gamma); also seen as CD122 (beta), CD132 (gamma))

The Interleukin-2 receptor beta chain and gamma chain (IL-2Rβ and IL-2Rγ) are membrane-bound proteins that form part of the heterotrimeric interleukin-2 receptor complex, together with the alpha chain (CD25)[2]. These chains belong to the type I cytokine receptor family, and their combination determines the affinity and functional signaling of the IL-2 receptor. Beta and gamma chains form the intermediate-affinity IL-2 receptor primarily on memory T cells and natural killer cells; when combined with the alpha chain, they form a high-affinity receptor on activated T cells and regulatory T cells[2]. Upon ligand binding, these chains mediate signal transduction for immune proliferation, differentiation, and survival, principally through activation of JAK1/JAK3 and downstream STAT phosphorylation[3][4]. The gamma chain (CD132) is shared by several other cytokine receptors (IL-4, IL-7, IL-9, IL-15, IL-21), underscoring its essential role in immune signaling and development[3][4]. Mutations in the gamma chain cause X-linked severe combined immunodeficiency (XSCID)[4][5]. IL-2 receptor-targeted therapies are used in cancer, autoimmune disease, and transplantation. Therapeutic challenges include balancing efficacy with immunotoxicity and avoiding excessive immunosuppression[2][5].

Other names

IL-2R betaCD122 (beta chain)IL-2R gammaCD132common gamma chainγc (gamma chain)

Inhibition of IL-2 receptor function: prevents T-cell activation and proliferation, used to block immune rejection in transplantation; Agonism (recombinant IL-2): stimulates immune cell proliferation and cytotoxic function; Partial agonism/selective modulation: engineered cytokines or bispecific antibodies selectively engage beta/gamma chains to boost specific immune responses.