The EIF2AK2 Knockout 786-O Polyclonal Cells consist of a CRISPR/Cas9-edited polyclonal knockout population derived from the 786-O renal cell adenocarcinoma line, featuring disruption of the EIF2AK2 gene to eliminate protein kinase R (PKR) function. This pooled format avoids clonal selection, providing a heterogeneous loss-of-function model appropriate for diverse functional analyses in oncology and innate immunity.
The parental 786-O line originates from clear cell renal cell carcinoma (ccRCC) and carries a biallelic VHL mutation, resulting in constitutive stabilization of hypoxia-inducible factors (HIFs) and persistent activation of HIF-responsive programs. This background recapitulates hallmark ccRCC features, making it an established platform for studying ccRCC biology, drug responses, and tumor?Cmicroenvironment interactions.
EIF2AK2 encodes PKR, a dsRNA-activated kinase that phosphorylates eIF2?? to block global translation, triggering the integrated stress response. PKR also activates NF-??B via I??B?? phosphorylation and promotes apoptosis through p53/TP53 and JNK/MAPK8. Its activity is regulated by interferons-??/??/??, PACT/PRKRA, and calcium. Downstream targets include eIF2??, I??B??, p53, and JNK. PKR interacts with TARBP2, PRKRA, NPM1, and viral proteins. The core pathway couples eIF2?? phosphorylation to transcriptional induction of ATF4 and DDIT3/CHOP, driving cellular adaptation or apoptosis.
In VHL-mutant ccRCC, PKR knockout provides a powerful model to investigate the intersection between innate immune signaling and oncogenic stress. Constitutive HIF activation drives pseudo-hypoxia, creating a unique context to examine PKR’s roles in translational control, apoptosis, and inflammatory responses. Loss of PKR can unveil contributions to tumor cell survival, proliferation, and sensitivity to therapeutic agents that target the integrated stress response or immune checkpoints. Additionally, this model enables exploration of PKR-dependent stress granule formation and metabolic adaptation, potentially revealing vulnerabilities linked to eIF2?? phosphorylation and CHOP-mediated death.
These knockout cells enable detailed dissection of PKR functions in ccRCC, including effects on proliferation, invasion, and drug sensitivity. They are optimal for innate immunity studies as PKR bridges dsRNA sensing to interferon and translational responses. PKR absence also aids oncolytic virus research where PKR restricts viral replication. Representative applications include western blotting for phospho?eIF2??, RT?qPCR for interferon?stimulated genes, stress granule immunofluorescence, apoptosis and migration assays, drug sensitivity tests, co?immunoprecipitation, and RNA?seq. For further details, please contact Ascent Research.
