The GSDMA knockout HEK293T polyclonal cells are a CRISPR/Cas9-edited population with heterogeneous GSDMA gene disruptions, collectively eliminating gasdermin A protein expression. Derived from the HEK293T human embryonic kidney line, this polyclonal pool minimizes clonal artifacts and provides a robust loss-of-function model. Supplied as a ready-to-use culture, it facilitates immediate application in signal transduction and cell death assays, particularly those interrogating gasdermin-mediated pyroptosis.
HEK293T cells stably express the SV40 large T-antigen, which enables high-copy episomal replication of plasmids containing the SV40 origin. This feature makes HEK293T a premier cell line for transient protein expression and lentiviral packaging. Despite their renal origin, HEK293T cells retain epithelial characteristics, including expression of cell junction proteins, and are employed to model epithelial barrier function and inflammatory signaling. The line??s combination of genetic tractability and epithelial phenotype provides a versatile platform for gene knockout studies.
Gasdermin A (GSDMA) is a pore-forming executioner of pyroptosis, a pro-inflammatory lytic cell death. Upon NLRP3 inflammasome activation, inflammatory caspases (CASP1/4/5) cleave GSDMA, releasing an N-terminal fragment that oligomerizes to form plasma membrane pores. This permeabilization causes release of IL-1??, IL-18, LDH, and HMGB1. GSDMA transcription is regulated by NF-??B downstream of TNF-?? and IL-1?? receptors, and gasdermin A physically associates with cell junction proteins, linking pyroptosis to epithelial barrier control. Knockout of GSDMA thus uncouples caspase activation from pore-induced cell death, enabling study of parallel signaling pathways.
In the HEK293T background, GSDMA disruption abolishes the cell??s pyroptotic response when the NLRP3 pathway is reconstituted via transfection, allowing researchers to distinguish upstream inflammasome signaling from downstream pore formation. This is especially valuable for examining GSDMA??s role in epithelial barrier regulation, given its interaction with junctional complexes. Consequently, the knockout cells support investigations into diseases such as inflammatory bowel disease, asthma, and atopic dermatitis, where dysregulated pyroptosis and barrier breakdown are implicated. The model also aids in dissecting caspase-dependent but pyroptosis-independent events.
These polyclonal knockout cells enable a wide range of assays, including LDH release for pyroptosis quantification, IL-1?? ELISA, caspase activity measurements, immunofluorescence visualization of pore formation, and RNA-seq transcriptional profiling. They are amenable to drug screening for gasdermin A inhibitors and co-immunoprecipitation studies of GSDMA interaction partners. By eliminating GSDMA function, this cellular tool accelerates research into gasdermin-driven inflammatory cell death and epithelial pathology. For further details or custom gene-editing inquiries, please contact Ascent Research.
