The EIF2AK2 Knockout AGS Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout population derived from the AGS human gastric adenocarcinoma cell line, harboring targeted disruption of the EIF2AK2 gene. This heterogeneous loss-of-function model preserves the gastric epithelial properties of the parental line while mitigating clonal artifacts, offering a robust platform for functional genomics studies in a physiologically relevant context.
The AGS line, established from a human gastric adenocarcinoma, is a well-characterized model of gastric epithelial biology. Its adherent, epithelial morphology and malignant background make it ideal for investigating gastric cancer pathobiology, host?Cpathogen interactions, and stress signaling networks. These features are especially pertinent for dissecting EIF2AK2-mediated responses relevant to gastric mucosal immunity and oncogenic transformation.
EIF2AK2 encodes PKR, a dsRNA-activated serine/threonine kinase central to innate immunity and the integrated stress response. Upon activation by dsRNA or the protein activator PACT/PRKRA, PKR phosphorylates eIF2??, suppressing global translation while selectively upregulating stress-responsive genes such as ATF4 and CHOP. PKR also triggers NF-??B-dependent inflammation via I??B?? (NFKBIA) phosphorylation and engages the MAPK pathway, thereby promoting apoptosis. PKR interacts with TARBP2 and ADAR1 and operates downstream of cytosolic sensors RIG-I, MDA5, and TLR3, highlighting its role as a central integrator of antiviral innate immunity and translational control.
In AGS cells, EIF2AK2 knockout allows dissection of PKR-dependent mechanisms in gastric adenocarcinoma, including regulation of cell survival, apoptosis, and inflammatory signaling via NF-??B and MAPK pathways, as well as stress granule dynamics and the unfolded protein response. This model is especially valuable for studying the link between chronic inflammatory triggers, innate immunity, and gastric carcinogenesis.
Representative assays include monitoring eIF2?? phosphorylation by western blot, quantifying ISG expression via RT-qPCR, visualizing stress granules with immunofluorescence, performing apoptosis and NF-??B reporter assays, and conducting RNA-seq for transcriptome-wide changes. Co-immunoprecipitation of PKR with dsRNA or regulatory partners and drug sensitivity profiling are also applicable. These cells provide a versatile loss-of-function platform for antiviral innate immunity, gastric cancer signaling, and translational control research. Contact Ascent Research for details.
