The DKK1 Knockout SK-HEP-1 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population derived from the SK-HEP-1 human hepatic adenocarcinoma cell line. This product features targeted disruption of the DKK1 gene, eliminating expression of the secreted Dickkopf-1 Wnt antagonist. The heterogeneous polyclonal pool serves as a versatile loss-of-function model free from clonal biases, enabling investigation of DKK1-dependent signaling in a liver-derived cellular environment.
SK-HEP-1 cells originate from the ascites of a liver adenocarcinoma patient and exhibit an endothelial-like phenotype, commonly used to model liver sinusoidal endothelial cells. This line recapitulates aspects of angiogenesis, hepatocarcinogenesis, and metastasis, and endogenously expresses Wnt pathway components, providing a physiologically relevant background for modulating DKK1 function.
DKK1 inhibits canonical Wnt/??-catenin signaling by binding LRP5 and LRP6 co-receptors together with Kremen proteins KREMEN1 and KREMEN2, triggering internalization of the Wnt receptor complex and preventing signalosome formation. This stabilizes the ??-catenin destruction complex (AXIN, APC, GSK3??), leading to ??-catenin phosphorylation and degradation. Consequently, TCF/LEF-dependent transcription of targets such as MYC, CCND1, and AXIN2 is repressed. DKK1 expression is regulated by WNT ligands, TGF-??, BMPs, and transcription factors p53 and NF-??B, integrating multiple signaling inputs.
In the SK-HEP-1 background, DKK1 loss relieves inhibition of autocrine Wnt signaling, potentially enhancing proliferation, migration, and angiogenic programs. This model is particularly relevant for hepatocellular carcinoma research, where Wnt pathway hyperactivation is a common oncogenic driver and DKK1 has been implicated in tumor progression, stemness, and drug resistance. The polyclonal knockout cells allow dissection of DKK1’s role in endothelial-like tumor cell behavior and microenvironmental crosstalk.
These cells are suited for Wnt reporter assays (e.g., TOPFlash), ??-catenin stabilization analysis by Western blot, and RT-qPCR for MYC and AXIN2. Functional studies include cell migration and tube formation assays, while co-immunoprecipitation can probe LRP5/6 complex dynamics. The polyclonal pool is also amenable to drug screening and RNA-seq-based transcriptomic profiling. For technical inquiries, contact Ascent Research.
