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Interleukin-12 receptor beta 1 and beta 2 complex (IL-12Rβ1/IL-12Rβ2 complex)

Target: IL-12Rβ1/IL-12Rβ2 complex
Molecular classification: Receptor, Cytokine receptor, Type I cytokine receptor family

Overview

The Interleukin-12 receptor beta 1 and beta 2 complex consists of two transmembrane subunits: IL-12Rβ1 and IL-12Rβ2. Together, they form the functional high-affinity receptor for the heterodimeric cytokine interleukin-12. IL-12Rβ1 also serves in the receptor complex for interleukin-23. Upon binding IL-12, the receptor complex activates the JAK2 and Tyk2 tyrosine kinases, leading to phosphorylation and activation of STAT4, which drives Th1 cell differentiation and type 1 immune responses. Deficiency or aberrant signaling of this receptor complex is implicated in immune system disorders, susceptibility to infection, autoimmunity, and is a current target of monoclonal antibody therapies designed for inflammatory diseases

Other names: Interleukin-12 receptor complexIL-12 receptor heterodimerIL-12R complexIL-12Rβ1/β2IL12RB1/IL12RB2 complex

Mechanism of action

Inhibition of IL-12 binding to IL-12R complex (e.g., antibody or ligand blockade prevents receptor activation and downstream STAT4 signaling) Downregulation of Th1 responses via blockade of receptor signaling

Biological functions

Immune responseSignal transductionPromotion of Th1 cell differentiationActivation of JAK-STAT pathway (especially STAT4)

Disease associations

InflammationAutoimmunityInfectionAllergy (protective role indicated in mouse models)Potential involvement in cancer immunology

Safety considerations

Immune suppression and increased risk of infection due to inhibition of Th1 responsesPotential worsening of allergies or impaired tumor immunity when IL-12R signaling is suppressed

Interacting drugs

Ustekinumab (blocks IL-12/IL-23 pathway via binding to p40 subunit, indirectly blocks IL-12R signaling)

1 more in the full profile.

Biomarkers

IL12RB1 and IL12RB2 expression (can indicate Th1 immune activation and may be used in patient selection for anti-cytokine therapies)STAT4 activation/phosphorylation as a functional readout

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