The EIF2AK1 Knockout A2780 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population generated from the A2780 human ovarian carcinoma cell line. This loss-of-function model features disruption of the EIF2AK1 gene (also known as HRI, heme-regulated inhibitor), enabling investigation of stress-responsive kinase signaling in a cancer background. The knockout is produced using CRISPR/Cas9-mediated gene disruption, resulting in a heterogeneous pool of knockout cells that abolishes functional EIF2AK1 protein expression without selection for a single clonal genotype.
The A2780 host cell line is an epithelial ovarian carcinoma model extensively characterized for its cisplatin-resistant properties. Originally derived from an untreated patient, A2780 cells serve as a widely accepted system for studying acquired drug resistance mechanisms. Their use in this polyclonal knockout population provides a relevant backdrop for examining how EIF2AK1 contributes to stress adaptation and survival pathways that may intersect with chemoresistance.
EIF2AK1 functions as a serine/threonine kinase that directly phosphorylates the ?? subunit of eukaryotic initiation factor 2 (eIF2??) in response to diverse cellular stresses, including heme deficiency, oxidative stress, heat shock, and proteasome inhibition. This phosphorylation event attenuates global protein synthesis while selectively enhancing translation of transcription factor ATF4, which in turn upregulates stress-responsive genes such as CHOP (DDIT3). EIF2AK1 activity is modulated through interactions with heme and Hsp90, with heme binding repressing kinase activity under normal conditions. The EIF2AK1?Cphospho-eIF2???CATF4?CCHOP axis constitutes a central arm of the integrated stress response, orchestrating adaptive or apoptotic outcomes depending on stress severity and duration.
Disruption of EIF2AK1 in A2780 cells is expected to impair the integrated stress response, rendering the cells more susceptible to stressors that normally activate this pathway. Since A2780 cells are a model of cisplatin-resistant ovarian cancer, and because stress response pathways are often co-opted by cancer cells to survive chemotherapeutic insult, this knockout model offers a tool to dissect the role of translational control in drug resistance. Loss of EIF2AK1 may alter the cellular threshold for stress-induced apoptosis and affect the expression of downstream effectors implicated in tumor cell survival.
The EIF2AK1 Knockout A2780 Polyclonal Cells are ideally suited for a range of experimental applications, including mechanistic studies of the integrated stress response, translational regulation in cancer, and the contribution of eIF2?? phosphorylation to drug resistance. Typical assays include western blotting to detect phospho-eIF2?? and ATF4 levels, RT-qPCR analysis of stress target gene expression, cell viability measurements under heme deprivation or oxidative challenge, polysome profiling to assess global translation, and ATF4 translational reporter assays. The polyclonal nature of the population allows for assessment of heterogeneous knockout effects, providing a physiologically relevant model for stress signaling research. For additional product details or technical support, please contact Ascent Research.
