Description

The STAT3 Knockout HEK293 Cell Line is a CRISPR/Cas9-edited knockout cell line in which the STAT3 gene has been disrupted to abolish expression of the STAT3 transcription factor. This defined loss-of-function model allows researchers to dissect STAT3-dependent signaling and transcriptional regulation in a human cellular context. It provides an essential tool for comparative studies alongside wild-type HEK293 cells across a spectrum of biomedical research applications.

The parental HEK293 cell line is an immortalized human embryonic kidney epithelial line transformed with adenovirus 5 DNA. Recognized for high transfection efficiency and robust protein expression, HEK293 cells are a mainstay in signal transduction research, recombinant protein production, and viral vector generation. This background retains key signaling machinery, making it suitable for examining STAT3 function, particularly given its epithelial origin and responsiveness to extracellular stimuli.

STAT3 is a central transcription factor that transmits signals from IL-6 family cytokines (IL-6, LIF, OSM) and growth factors (EGF, PDGF) to the nucleus. Upon ligand binding, receptor-associated JAK1/JAK2 kinases phosphorylate STAT3, inducing dimerization, nuclear translocation, and direct transcriptional activation of target genes. Key downstream effectors include anti-apoptotic BCL2, cell cycle regulator CCND1, and angiogenic VEGFA. STAT3 activity is modulated by interacting partners such as CREBBP/p300, SOCS3, and PIAS1, and intersects with NF-??B and MAPK pathways, highlighting its role at a convergence point of multiple signaling cascades.

In HEK293 cells, STAT3 knockout eliminates cytokine- and growth factor-driven transcriptional programs, creating an unambiguous null background for functional studies. Because HEK293 cells express relevant receptors (gp130, EGFR) and kinases (JAK1, JAK2), the knockout line enables clear attribution of phenotypes to STAT3 activity. This is especially valuable for characterizing STAT3 inhibitors, as comparison with the knockout distinguishes on-target effects from off-target activities. The model also supports genetic and chemical screening campaigns aiming to identify modifiers of STAT3-dependent cellular readouts.

Applications include analyzing STAT3-dependent gene expression by RT-qPCR (BCL2, VEGFA), measuring proliferation and apoptosis (MTT, Annexin V) upon cytokine challenge, and performing phospho-STAT3 western blotting. The cell line is ideal for JAK-STAT inhibitor profiling and for studying STAT3??s role in oncogenesis, autoimmune disease, and inflammatory signal transduction. It also facilitates investigation of cross-talk between JAK-STAT and other pathways. For further information, please contact Ascent Research.