Host interferon signaling proteins

Host interferon signaling proteins encompass a diverse group of host cell proteins that mediate the intracellular effects of interferon cytokines, which include type I (IFN-α, IFN-β), type II (IFN-γ), and type III (IFN-λ) interferons[3][4][7]. Following interferon receptor engagement by interferon ligands, these proteins include: - Cytokine receptors (e.g., IFNAR1/2, IFNGR1/2, IFNLR1, IL-10R2), which bind interferons on the cell surface and initiate signaling[4][7][8]. - Janus kinases (e.g., JAK1, JAK2, TYK2), which are associated with the cytoplasmic domains of receptors and become activated upon ligand binding, phosphorylating downstream signal transducers[1][2][6][8]. - Signal transducer and activator of transcription (STAT) proteins (e.g., STAT1, STAT2), which, once phosphorylated, dimerize and translocate to the nucleus to regulate transcription of interferon-stimulated genes (ISGs) critical for antiviral and immunomodulatory responses[1][2][3][7]. - Additional molecules involved in noncanonical signaling, such as MAP kinases, PI3K, and regulatory adaptor proteins (e.g., CRKL), further diversify the signaling outputs[1][8]. Dysregulation of these signaling proteins broadly impacts innate and adaptive immunity, contributing to susceptibility to infections, chronic inflammation, autoimmunity, and cancer[3][5][7]. Because the term does not specify a single protein but rather a set of molecular participants in the interferon-signaling pathway, it is not conventionally considered a singular "therapeutic target" but a major immune signaling system. For structured target-based research, the analysis must be narrowed to specific interferon receptors (e.g., "Interferon alpha/beta receptor 1") or key mediators (e.g., "Janus kinase 1", "Signal transducer and activator of transcription 1")[1][2][4][6][8].

Other names

Interferon pathway proteinsInterferon signal transducersInterferon signaling components

Activation of JAK-STAT pathway, Modulation of immune gene expression, Inhibition of viral replication, Upregulation of antigen presentation