ESD Knockout Raji Polyclonal Cells constitute a CRISPR/Cas9-edited polyclonal knockout cell population derived from the human Raji B lymphocyte line, designed for loss-of-function studies of the ESD gene. The polyclonal format preserves heterogeneous editing events, providing a robust model for evaluating ESD-dependent cellular processes without clonal selection. CRISPR/Cas9-mediated disruption of ESD eliminates esterase D (S-formylglutathione hydrolase) activity, enabling targeted investigation into glutathione recycling, formaldehyde detoxification, and redox homeostasis in a B cell context.
Raji cells are an Epstein-Barr virus (EBV)-positive B lymphoblastoid line established from a patient with Burkitt’s lymphoma. These cells exhibit rapid proliferation and retain key features of B lymphocyte biology, including expression of B cell markers and immune effector functions. The oncogenic background, driven by MYC translocation and latent EBV gene expression, makes Raji cells particularly relevant for studying B cell malignancies, growth signaling, and drug response mechanisms. Their lymphoblastoid phenotype supports scalable culture conditions compatible with high-throughput assays.
At the molecular level, ESD encodes a serine hydrolase that catalyzes the glutathione-dependent hydrolysis of S-formylglutathione to formic acid and reduced glutathione (GSH). Under electrophilic stress, the transcription factor NRF2 upregulates ESD expression, positioning ESD downstream of antioxidant response pathways. In this knockout model, disruption of ESD abolishes S-formylglutathione hydrolase activity, preventing regeneration of GSH from S-formylglutathione. Consequently, formaldehyde accumulation may occur, with potential reliance on alternative detoxification enzymes such as ADH5 (formaldehyde dehydrogenase). Key pathway components affected include S-formylglutathione, glutathione, and formaldehyde, integrating ESD into broader glutathione metabolism and cellular redox control networks.
In the Raji B cell context, ESD knockout provides a targeted tool to dissect how glutathione metabolism and formaldehyde sensitivity influence oncogenic cell behavior. B cell malignancies often exhibit altered redox balance, and glutathione depletion can sensitize lymphoma cells to chemotherapeutic agents. Eliminating ESD-mediated glutathione recycling may exacerbate oxidative stress, impair proliferation, or modulate apoptotic thresholds under formaldehyde challenge. This model allows interrogation of ESD-dependent growth and survival mechanisms in a malignant B lymphocyte background, potentially uncovering vulnerabilities relevant to lymphoma treatment and redox-targeted therapies.
Researchers can employ these polyclonal knockout cells to investigate glutathione-dependent detoxification pathways, formaldehyde-induced DNA damage responses, and redox regulation in B cell cancer models. Such studies enable identification of synthetic lethal interactions with drugs that target glutathione synthesis or NRF2 signaling. Typical assays include RT-qPCR and Western blotting to confirm ESD disruption, glutathione quantification by enzymatic assay, formaldehyde challenge viability assays, flow cytometry for oxidative stress markers, and transcriptomic profiling via RNA-seq. For additional technical details or to request a quote, please contact Ascent Research.
