The HOOK3 Knockout SK-HEP-1 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population derived from the human SK-HEP-1 liver adenocarcinoma cell line, designed for loss-of-function studies of the HOOK3 gene. This heterogeneous pool of gene-disrupted cells enables robust investigation of HOOK3-dependent phenotypes while minimizing clonal selection artifacts. The product provides a versatile platform to explore HOOK3’s role as a negative regulator of innate immune signaling and microtubule-based transport, with broad applications in hepatocellular carcinoma research.
The host SK-HEP-1 cell line originates from the ascitic fluid of a liver adenocarcinoma patient and is characterized by an aneuploid karyotype, tumorigenicity in nude mice, and expression of both epithelial and endothelial markers. These cells serve as a well-established model for hepatocellular carcinoma biology, drug resistance, and metastasis. Their unique properties make them particularly suited for dissecting molecular mechanisms underlying tumor progression and immune evasion within a clinically relevant hepatic context.
HOOK3 encodes a microtubule motor adaptor that links cellular organelles to the dynein?Cdynactin complex, mediating minus-end-directed transport. A critical function of HOOK3 is the negative regulation of the cGAS-STING innate immune pathway: it interacts directly with STING (TMEM173) and dynein light chain (DYNLL1) to traffic STING to late endosomes and lysosomes, where it undergoes autophagy-mediated degradation. This process dampens type I interferon responses by limiting the activation of downstream kinases TBK1 and IRF3, thereby preventing excessive inflammation. HOOK3 also participates in Golgi organization and endolysosomal trafficking through interactions with RILP and other Hook family members (HOOK1, HOOK2).
In the context of hepatocellular carcinoma, disrupting HOOK3 expression in SK-HEP-1 cells is expected to stabilize STING and potentiate cGAS-STING signaling, potentially enhancing antitumor innate immunity. The polyclonal knockout model allows researchers to assess population-level effects on downstream pathways, including IFN-?? production, without the biases introduced by single-cell cloning. This system is particularly valuable for studying how autophagy-mediated STING degradation contributes to immune evasion and chemoresistance, providing insights into therapeutic strategies that target the pathway.
Typical applications include western blotting for HOOK3 and STING, RT-qPCR for IFN-??, phospho-TBK1/IRF3 analysis, immunofluorescence detection of STING?Clysosome colocalization, and STING degradation assays using cycloheximide chase. Functional experiments can be performed following cGAMP stimulation, such as interferon-?? ELISA, flow cytometry for apoptosis and cell cycle, and migration/invasion assays. These cells support investigations into cGAS-STING signaling, autophagy-mediated immune modulation, microtubule-dependent transport, and viral infection susceptibility. For additional technical information or support, please contact Ascent Research.
