The EIF2AK2 Knockout NCI-H1299 Polyclonal Cells from Ascent Research are a CRISPR/Cas9-edited polyclonal population of the NCI-H1299 human non-small cell lung carcinoma cell line, in which the EIF2AK2 gene has been disrupted. This heterogeneous knockout pool, generated via CRISPR/Cas9-mediated gene targeting, provides a stable loss-of-function model that avoids clonal artifacts and more faithfully represents a population-level knockout phenotype, making it well-suited for functional studies where cellular heterogeneity is important.
NCI-H1299 cells were originally derived from a lymph node metastasis of a lung adenocarcinoma in a 44-year-old male smoker and are a widely used model for lung adenocarcinoma. They retain key characteristics of non-small cell lung cancer, including deregulated growth and apoptosis, and their metastatic origin makes them valuable for investigating molecular mechanisms of lung cancer progression, drug resistance, and tumor?Cimmune interactions.
EIF2AK2 encodes the dsRNA-activated kinase PKR, a central regulator of antiviral innate immunity and translational control. Upon activation by viral dsRNA, interferon-??/??, TNF, oxidative stress, or the protein activator PACT (PRKRA), PKR phosphorylates eIF2?? (EIF2S1) at Ser51, leading to global translation inhibition and stress granule assembly. It also activates NF-??B and apoptotic pathways through interactions with adaptors such as FADD and caspases. PKR physically associates with TARBP2, STAT1, dsRNA-binding proteins, and HSP90, and acts in parallel with the eIF2?? kinases GCN2 (EIF2AK4) and PERK (EIF2AK3) to induce ATF4 transcriptional responses.
In the lung adenocarcinoma context of NCI-H1299, EIF2AK2 knockout permits dissection of PKR-dependent antiviral responses, translational control, and apoptosis specifically within lung cancer cells. It enables investigation of how loss of PKR-mediated translation repression and stress signaling affects tumor cell proliferation, sensitivity to chemotherapeutics or oncolytic viruses, and expression of interferon-stimulated genes. The polyclonal nature allows study of heterogeneous PKR loss on collective behaviors relevant to the tumor microenvironment.
This knockout population is ideally suited for western blot analysis of phospho-eIF2?? (Ser51), RT-qPCR of ISGs, and immunofluorescence detection of stress granule markers such as G3BP1. It supports Annexin V/PI apoptosis assays, NF-??B luciferase reporter systems, and polysome profiling for translation efficiency. Viral infection studies with VSV or EMCV can be used to probe PKR-dependent antiviral states. Additionally, the cells facilitate drug screening for PKR modulators and synthetic lethal interactions in lung cancer. For technical inquiries, contact Ascent Research.
