The BZW2 Knockout SK-HEP-1 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population targeting the BZW2 gene in the SK-HEP-1 human hepatic adenocarcinoma cell line. This product provides a loss-of-function model generated via CRISPR/Cas9-mediated gene disruption, avoiding clonal selection to retain population heterogeneity and minimize single-cell cloning artifacts. The polyclonal format is ideal for pooled functional screens and population-level assays where uniform genetic background is not essential.
SK-HEP-1 cells, despite their adenocarcinoma origin, exhibit hallmark endothelial characteristics including von Willebrand factor expression and acetylated LDL uptake, and are widely adopted as a liver sinusoidal endothelial cell (LSEC) model. LSECs line hepatic sinusoids and perform blood filtration, receptor-mediated endocytosis, and leukocyte adhesion. This endothelial-like context makes SK-HEP-1 a relevant platform for studying translation regulation and stress responses pertinent to liver sinusoidal biology.
BZW2 (eIF2B5) encodes the catalytic epsilon subunit of eIF2B, the guanine nucleotide exchange factor for eIF2 that is essential for translation initiation. Under homeostasis, eIF2B recycles eIF2-GDP to eIF2-GTP, sustaining protein synthesis. Upon stress, eIF2?? kinases (PERK, PKR, GCN2, HRI) phosphorylate eIF2??, converting it to a competitive inhibitor of eIF2B. This blocks general translation while selectively upregulating ATF4 translation, which activates ISR targets like CHOP and GADD34. BZW2 activity is also influenced by mTORC1, integrating nutrient signals with translational control.
BZW2 disruption in the SK-HEP-1 LSEC model allows dissection of eIF2B-dependent translation control in endothelial-like functions. Loss of catalytic eIF2B activity likely sensitizes cells to ER stress, impairs adaptive ISR signaling, and may alter endocytosis, cytokine responses, and adhesion molecule expression. This knockout is relevant for investigating mechanisms underlying VWM, cancer cell stress survival, and metabolic liver diseases, particularly how LSEC-like tumor cells manage proteotoxic stress.
These polyclonal knockout cells support diverse applications: Western blotting for eIF2?? phosphorylation and ATF4, ATF4 luciferase reporter assays, puromycin incorporation assays for global translation, polysome profiling, and co-immunoprecipitation of eIF2B complex components. Cell viability assays under ER stress agents (tunicamycin, thapsigargin) reveal altered stress sensitivity, and small-molecule screens can identify modulators of the ISR. For custom inquiries, contact Ascent Research.
