The IL18 Knockout SK-HEP-1 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population derived from the human liver adenocarcinoma cell line SK-HEP-1. These cells carry a targeted disruption of the IL18 gene, generating a loss-of-function model for interleukin-18 signaling. The polyclonal format avoids clonal bias and provides a heterogeneous population suitable for pooled knockout studies in hepatic cancer research.
SK-HEP-1 is a well-established human liver adenocarcinoma cell line originally isolated from patient ascites. It retains hepatic markers and responds to inflammatory stimuli, making it a relevant model for hepatocellular carcinoma biology and tumor microenvironment investigations. Knockout of IL18 in this background allows dissection of cytokine-specific contributions to cancer cell behavior.
IL-18 is a proinflammatory cytokine that signals through the heterodimeric IL-18R??/IL-18R?? receptor complex. Ligand binding recruits the adaptor MyD88 and kinase IRAK4, leading to activation of TRAF6 and TAK1. This cascade stimulates the IKK complex and MAP kinases p38 and JNK, resulting in NF-??B and AP-1-driven transcription of IFN-??, TNF-??, IL-6, and chemokines such as CCL2 and CCL3. IL-18 expression is induced by NLRP3 inflammasome/caspase-1, TLR4, and upstream cytokines including TNF-?? and IL-1??, and is negatively regulated by the soluble decoy IL-18BP. Disruption of IL18 in this model abrogates downstream NF-??B and MAPK activation.
In SK-HEP-1 cells, IL-18 may influence oncogenic signaling, cell proliferation, and migration. Given the frequent dysregulation of NF-??B and MAPK pathways in liver cancer, this knockout model enables the study of how IL-18 contributes to tumor-associated inflammation and immune cell recruitment. It serves as a platform to explore cytokine-mediated crosstalk within the tumor microenvironment.
This polyclonal knockout population is suited for western blot analysis of phospho-NF-??B and phospho-p38/JNK, RT-qPCR of downstream targets such as IFN-?? and CCL2, and ELISA to confirm loss of secreted IL-18. Functional assays can assess cell viability, proliferation, and migration/invasion, while co-culture experiments probe immune cell interactions. Sanger sequencing is recommended for genotype confirmation. For further details, please contact Ascent Research.
