The IPO5 Knockout SK-HEP-1 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population targeting the human IPO5 gene to eliminate Importin-5 protein expression. This loss-of-function model is generated in the SK-HEP-1 host background using a non-clonal CRISPR approach, yielding a heterogeneous pool of cells with gene-disrupting edits. It is designed for studying Importin-5-dependent nuclear transport processes without requiring single-cell clone isolation.
SK-HEP-1 is an immortalized human liver sinusoidal endothelial cell line derived from a hepatic adenocarcinoma. It retains LSEC characteristics such as filtration, endocytosis, and immune modulation, while also providing a robust platform for hepatocellular carcinoma research. Its endothelial nature and cancerous origin make it a versatile system for investigating liver-specific transport mechanisms and tumor biology.
IPO5 encodes Importin-5, a nuclear import receptor that recognizes cargos with classical NLS. It forms a complex with KPNB1 (importin ??1) and crosses the nuclear pore via NUP50, releasing cargo upon nuclear RanGTP binding. The Ran GTPase cycle, regulated by RanBP1 and RanGAP, drives directionality. IPO5 imports ribosomal proteins RPL5 and RPL23A, histone H1, p53, and viral proteins like HIV-1 Rev. Upstream regulators include RAN gradient, cyclin-dependent kinases, and growth factors, while disruption impacts ribosome biogenesis, cell cycle, and gene expression.
In SK-HEP-1 cells, IPO5 loss disrupts nuclear localization of critical cargo proteins, directly affecting liver endothelial functions and hepatocellular carcinoma pathways. The model enables dissection of how aberrant nuclear transport contributes to tumor progression, metastasis, and drug resistance within a hepatic endothelial context. Furthermore, it provides a means to explore the interplay between nucleocytoplasmic trafficking and immune modulation or viral infection in liver sinusoids.
Applications include immunoblotting and RT-qPCR for expression analysis, immunofluorescence for tracking cargo mislocalization, cell viability and apoptosis assays for functional studies, and Transwell migration assays for motility assessment. The cells are suitable for synthetic lethality screens, drug response profiling, and investigation of IPO5-dependent nuclear import dynamics. For further information, please contact Ascent Research.
