NCIt definition : Exhibiting a broad range of biological activities on T and natural killer cells, Interleukin-12
is a disulfide-bonded heterodimeric cytokine composed of a 35-kD IL12A subunit (IL-6
Superfamily) and a 40-kDa IL12B subunit (Type I Cytokine Receptor 3 Family). IL12
stimulates T-cell-independent production of IFN-gamma by PBMCs, enhances NK cell lytic
activity, acts as a growth factor for T- and NK-cells, and is important for Th1 and
Th2 cell differentiation. Lymphocyte responses to IL12 require NOS2A and are mediated
by STAT4 activator of transcription. (NCI);