| Protein Name | Signal Transducer and Activator of Transcription 4 |
| Gene | STAT4 |
| UniProt ID | Q14765 |
| PDB IDs | 3C54, 4B7Z, 5O0R |
| Molecular Weight | 84 kDa |
| Subcellular Localization | Cytoplasm, nucleus |
| Protein Family | STAT family |
Signal Transducer and Activator of Transcription 4 is a STAT family member. The protein contains the characteristic domain structure including [domain descriptions]. The molecular weight is approximately 84 kDa, and the protein localizes to Cytoplasm, nucleus.
Signal transducer and activator of transcription 4 (STAT4) is a transcription factor activated primarily by IL-12, IL-23, and type I interferons. Upon cytokine binding, STAT4 is phosphorylated by JAK kinases, dimerizes, and translocates to the nucleus. STAT4 is essential for Th1 and Th17 cell differentiation, regulating genes involved in inflammation, cell proliferation, and apoptosis. In the nervous system, STAT4 is involved in neuroinflammation and is activated in glial cells in response to cytokines.
STAT4 polymorphisms increase risk of autoimmune diseases including rheumatoid arthritis, systemic lupus erythematosus (SLE), and Sjögren's syndrome. STAT4 contributes to chronic inflammation in neurodegenerative diseases through microglial activation.
This protein is a potential therapeutic target for neurodegenerative diseases. Research is ongoing to develop small molecule inhibitors and biologics that modulate its activity.
This section provides background information on the gene/protein and its role in the nervous system.
This overview section needs to be expanded with relevant scientific information from peer-reviewed sources.