Interferon receptor complex (IFNR)

The interferon receptor complex refers to a group of multi-subunit cell surface receptors that mediate the biological activities of interferons (IFNs), which are essential cytokines for host defense against pathogens and tumors. These complexes are classified into three types: Type I (comprising IFNAR1 and IFNAR2), Type II (comprising IFNGR1 and IFNGR2), and Type III (comprising IFNLR1 and IL10RB). Upon ligand binding, these receptors activate the Janus kinase-signal transducer and activator of transcription (JAK-STAT) signaling pathway, specifically involving JAK1 and TYK2 for Type I/III or JAK1 and JAK2 for Type II. This activation leads to the nuclear translocation of STAT complexes and the subsequent transcription of hundreds of interferon-stimulated genes (ISGs) that establish an antiviral state and modulate immune cell functions (Frontiers in Immunology, 2020; Wikipedia, 2024). Dysregulation of interferon receptor signaling is a hallmark of various autoimmune and inflammatory conditions, such as systemic lupus erythematosus (SLE) and hemophagocytic lymphohistiocytosis (HLH). Conversely, deficiencies in these receptors can lead to severe susceptibility to viral infections, including COVID-19 and herpes simplex encephalitis. Therapeutically, the complex is targeted by recombinant interferon agonists to treat viral hepatitis, multiple sclerosis, and certain cancers, while monoclonal antibodies like anifrolumab are used to block receptor signaling in autoimmune diseases (NIH, 2021; Selleckchem, 2024). Monitoring the "interferon signature" or ISG expression serves as a critical biomarker for patient stratification and assessing therapeutic response in clinical settings.

Other names

IFN receptorInterferon-alpha/beta receptor (IFNAR)Interferon-gamma receptor (IFNGR)Interferon-lambda receptor (IFNLR)Type I interferon receptorType II interferon receptorType III interferon receptor

Binding of interferon ligands to the receptor complex induces receptor dimerization and activation of associated Janus kinases (JAK1, JAK2, or TYK2), which phosphorylate STAT proteins (STAT1, STAT2). These phosphorylated STATs form transcription factor complexes (such as ISGF3 or GAF) that translocate to the nucleus to initiate the expression of interferon-stimulated genes (ISGs) (Frontiers in Immunology, 2020; Wikipedia, 2024).