The EIF2AK2 Knockout Huh-7 Polyclonal Cells represent a CRISPR/Cas9-edited polyclonal knockout cell population derived from the human Huh-7 hepatocellular carcinoma cell line. This loss-of-function model disrupts the gene encoding PKR, enabling robust investigation of innate immune signaling and stress responses without the biases of clonal selection.
The parental Huh-7 line, isolated from a liver tumor in a 57-year-old Japanese male, is a well-differentiated, epithelial hepatocellular carcinoma line with preserved hepatocyte functions. It is permissive for hepatitis C virus (HCV) replication and widely employed in hepatic drug metabolism, viral hepatitis, and liver cancer studies, providing a physiologically relevant host for PKR pathway analysis.
EIF2AK2 encodes the double-stranded RNA (dsRNA)-dependent protein kinase PKR, a serine/threonine kinase that phosphorylates the ?? subunit of eukaryotic translation initiation factor 2 (eIF2??) at Ser51. Activation occurs upon binding to dsRNA, interferons-??/??, or tumor necrosis factor (TNF), and through interaction with PACT/PRKRA. Phosphorylated eIF2?? inhibits global cap-dependent translation while selectively upregulating ATF4 and its downstream target CHOP, driving apoptosis or autophagy. PKR additionally activates NF-??B via IKK, leading to pro-inflammatory cytokine expression, and promotes stress granule assembly. The kinase also interacts with TARBP2 and ADAR1, positioning it as a central coordinator of the integrated stress response and antiviral innate immunity.
In the hepatocellular carcinoma context, the EIF2AK2 knockout is instrumental for dissecting PKR??s role in HCV?Chost interactions, as HCV-generated dsRNA activates PKR and the virus has evolved countermeasures. These polyclonal cells allow researchers to examine how PKR shapes viral replication, interferon responses, and stress granule dynamics. Moreover, they facilitate studies on PKR-dependent apoptosis, proliferation, and chemoresistance in liver cancer, bridging innate immunity and tumor biology within a clinically relevant hepatic model.
Key experimental applications encompass Western blotting for phospho-eIF2?? and total eIF2??, HCV replicon assays, interferon-sensitive response element (ISRE) luciferase reporters, immunofluorescence for stress granules, caspase activity measurements, and polysome profiling. The cells are also suitable for co-immunoprecipitation of PKR interactors, ATF4-target gene analysis via RNA-seq, and drug sensitivity screening with agents like sorafenib. For further technical details or custom inquiries, please contact Ascent Research.
