GSR Knockout HAP1 Cell Line

The choice depends on whether you are studying GSR (glutathione reductase)'s role as the principal recycler of oxidized glutathione (GSSG) back to reduced glutathione (GSH) or modeling glutathione-dependent redox biology. The Knockout line is the standard tool for asking whether GSR is required for these processes — GSR is a NADPH-dependent flavoprotein that reduces GSSG to GSH, maintaining the cellular GSH/GSSG ratio that is the principal cytosolic redox buffer; GSR loss results in GSSG accumulation and impaired glutathione-dependent antioxidant defense. Overexpression is useful for studying GSR in oxidative stress contexts. For redox biology research, the EDITGENE GSR Knockout in HAP1 enables study of glutathione recycling. Rescue with wild-type or catalytically-dead GSR is the standard specificity control. The knockout is valuable for studying ferroptosis (GSH-GPX4 axis), glutathione-dependent detoxification, and emerging GSR-targeted therapeutics — GSR inhibitors (carmustine, BCNU) have been explored for cancer chemosensitization.

Primary applications: • GSH/GSSG redox balance: cellular GSH and GSSG quantification by LC-MS or Ellman's assay to characterize glutathione recycling. • Ferroptosis sensitivity: GPX4-mediated lipid peroxide clearance studies given the GSH-GPX4 axis in ferroptosis defense. • Oxidative stress response: H₂O₂, paraquat, or KBrO3-induced toxicity in GSR-null cells. • GSR inhibitor specificity: critical genetic control for carmustine (BCNU) and other GSR-targeting compounds in cancer chemosensitization research. EDITGENE recommends this model for researchers investigating glutathione redox biology, ferroptosis defense, and GSR-targeted cancer chemosensitization.

Yes. GSR rescue experiments are well-established for redox biology research: • Construct design: use a codon-modified GSR sequence with a small C-terminal tag (FLAG, HA). GSR has FAD-binding domain, NADPH-binding domain, and dimerization domain — preserve all elements. • Catalytically-dead rescue: catalytic cysteine mutations or FAD-binding residue mutations abolish glutathione reductase activity and serve as the standard specificity control. • Mitochondrial vs cytosolic isoform rescue: GSR has cytosolic and mitochondrial isoforms (alternative translation initiation) — choose appropriate isoform. • Functional readout: rescue should restore cellular GSH/GSSG ratio and oxidative stress tolerance. HAP1-specific considerations: • Diploidization: HAP1 cells gradually diploidize during extended culture — confirm ploidy by flow cytometry at the time of phenotypic assay. • Integration site sensitivity: position effects on transgene expression are more pronounced in near-haploid backgrounds; generating multiple independent rescue clones is strongly recommended. • Transduction efficiency: HAP1 transduces with lentivirus at moderate efficiency — increase MOI compared to standard immortalized lines.