Signal transducer and activator of transcription (STAT) signaling pathway (STAT pathway)

The Signal Transducer and Activator of Transcription (STAT) signaling pathway is a fundamental intracellular mechanism that converts extracellular signals from cytokines and growth factors into specific gene expression programs (Source: NIH, PubMed). The pathway is typically initiated by the binding of ligands to cell-surface receptors, which activates associated Janus kinases (JAKs) to phosphorylate the receptors and subsequently the STAT proteins themselves (Source: StatPearls). Once phosphorylated, STAT proteins form homo- or heterodimers and translocate into the nucleus, where they bind to promoter regions of target genes to regulate cell growth, survival, and immune function (Source: UniProt). Dysregulation of this pathway, particularly the constitutive activation of STAT3 and STAT5, is a hallmark of many human cancers and inflammatory diseases, contributing to tumor progression, metastasis, and immune evasion (Source: Nature Reviews Cancer). Consequently, the STAT pathway is a major focus for therapeutic development, with strategies including the use of JAK inhibitors to block upstream activation and the development of direct STAT inhibitors to prevent transcriptional activity (Source: Journal of Clinical Investigation).

Other names

JAK-STAT signaling pathwaySTAT protein familySignal transducer and activator of transcription family

Inhibition of upstream Janus kinases (JAKs) to prevent STAT phosphorylation, or direct interference with STAT protein dimerization, nuclear translocation, and DNA binding (Source: PubMed).