ATP7B Knockout SK-HEP-1 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal cell population derived from the human SK-HEP-1 liver adenocarcinoma line. This heterogeneous pool harbors targeted disruptions of the ATP7B locus, eliminating reliance on single-cell cloning and providing a robust platform for studying gene function in a mixed genetic background. The polyclonal format reduces clonal variation artifacts, making it ideal for high-throughput screens and functional genomics assays where broad representation of editing outcomes is desirable. Researchers can directly interrogate copper-transport mechanisms using this accessible, well-characterized model.
The SK-HEP-1 cell line originates from ascitic fluid of a patient with hepatocellular carcinoma and uniquely co-expresses epithelial and endothelial markers. This dual phenotype supports its use in liver cancer biology, angioinvasion studies, and investigations of the hepatic sinusoidal niche. Despite its origin, SK-HEP-1 retains certain hepatocyte-like functions, permitting examination of hepatic metabolic pathways, including copper homeostasis, in a malignancy-associated milieu. The line??s adaptability to genetic manipulation further enhances its value for creating disease-reflective in vitro systems.
ATP7B, encoding a copper-transporting ATPase, is essential for biliary copper excretion and holoceruloplasmin biosynthesis. ATOX1 delivers copper to ATP7B, which traffics to the apical membrane upon copper stimulation, a process regulated by COMMD1. Transcription is controlled by HNF4A, SP1, and HIF1A, while downstream targets include ceruloplasmin, metallothioneins MT1A/MT2A, and the importer SLC31A1. Knockout abrogates copper export, causing intracellular copper buildup, oxidative stress, and loss of holoceruloplasmin activity, mirroring Wilson disease defects.
Disruption of ATP7B in SK-HEP-1 creates a surrogate for Wilson disease hepatic pathology, characterized by copper-induced oxidative damage and ceruloplasmin deficiency. The endothelial-like features of SK-HEP-1 further allow exploration of copper toxicity in the liver sinusoidal and tumor microenvironment, linking ATP7B loss to hepatocellular carcinoma mechanisms. Because the cells retain copper-inducible gene regulation, the knockout reveals adaptive responses of metallothioneins and stress pathways, offering a controlled system to dissect the molecular interplay between copper overload and hepatic injury.
The ATP7B Knockout SK-HEP-1 Polyclonal Cells are validated for numerous downstream applications. Western blotting and RT-qPCR confirm loss of ATP7B and induction of metallothionein genes (MT1A, MT2A). Intracellular copper measurements, ceruloplasmin activity assays, and immunofluorescence provide functional readouts of copper export blockade. Copper-overload viability studies enable hepatotoxicity profiling and identification of therapeutic modifiers. This model serves as a versatile tool for Wilson disease pathophysiology, copper metabolism research, and drug discovery efforts. For additional assistance, please contact Ascent Research.
