Interleukin-12 subunit alpha (IL-12A) (IL-12A)

The p35 subunit, also known as Interleukin-12 subunit alpha (IL-12A), is a critical component of the IL-12 family of cytokines (UniProt). It heterodimerizes with EBI3 to form the immunosuppressive cytokine IL-35, and with p40 to form the pro-inflammatory cytokine IL-12 (NIH). IL-35 is primarily produced by regulatory T cells (Tregs) and regulatory B cells (Bregs), where it acts to suppress effector T cell proliferation and promote the expansion of further regulatory populations (Frontiers in Immunology). In the context of cancer, IL-35 is often upregulated in the tumor microenvironment, contributing to immune evasion by inhibiting anti-tumor cytotoxic T cell responses (PubMed). Conversely, in autoimmune and inflammatory diseases, a deficiency in IL-35 or an excess of IL-12 can lead to uncontrolled inflammation (MDPI). Therapeutic strategies targeting the p35 subunit include the use of neutralizing antibodies to block IL-35-mediated immunosuppression in oncology and the administration of recombinant IL-35 or gene therapy to restore immune tolerance in autoimmune conditions (AACR). Because p35 is shared with IL-12, drugs affecting this subunit must be carefully designed to avoid unintended effects on pro-inflammatory pathways (Nature Communications).

Other names

p35IL-12 p35Interleukin-12 subunit alphaIL12ACytotoxic lymphocyte maturation factor 35 kDa subunitCLMF p35NK cell-stimulating factor chain 1NKSF1

Neutralization of immunosuppressive activity in cancer or supplementation of anti-inflammatory activity in autoimmune diseases.