This product comprises a CRISPR/Cas9-edited polyclonal population of SK-HEP-1 cells, in which the HDAC4 gene has been disrupted to create a heterogeneous pool of knockout cells. The polyclonal format provides a diverse array of genetic alterations across the cell population, enabling robust functional studies without the clonal selection biases inherent in single-cell-derived lines. This loss-of-function model is designed for researchers examining the role of histone deacetylase 4 in hepatic cellular processes, transcriptional regulation, and oncogenic signaling pathways. The cells retain the parental SK-HEP-1 characteristics while lacking full-length HDAC4 protein, allowing dissection of its contributions to chromatin dynamics and gene expression control.
The SK-HEP-1 host cell line is a human liver adenocarcinoma line originally derived from the ascites of a patient with hepatocellular carcinoma. These cells display an epithelial morphology and are widely used as a model system for liver cancer biology, including studies of tumor growth, metastasis, and drug resistance. SK-HEP-1 cells harbor genetic and signaling features representative of aggressive HCC, and their tumorigenic potential in vitro and in vivo makes them a valuable platform for evaluating oncogene and tumor suppressor functions. The integration of HDAC4 knockout into this background provides a physiologically relevant context for investigating epigenetic modifiers in liver cancer.
HDAC4 belongs to the class IIa family of histone deacetylases and functions primarily as a transcriptional corepressor. It shuttles between the nucleus and cytoplasm in response to phosphorylation signals mediated by upstream kinases such as CaMKII, PKA, PKC, and Aurora B kinase. Within the nucleus, HDAC4 associates with the NCoR/SMRT corepressor complex and deacetylates lysine residues on histone H3 and H4 tails, leading to chromatin compaction and gene silencing. It also directly deacetylates transcription factors including MEF2, p53, STAT1, and FOXO, thereby repressing their transcriptional activity. HDAC4 activity is further regulated by 14-3-3 proteins, which bind to phosphorylated HDAC4 and anchor it in the cytoplasm, preventing nuclear translocation and target gene suppression.
In the context of hepatocellular carcinoma, HDAC4 is implicated in tumor progression, apoptosis evasion, and altered differentiation. Its overexpression or aberrant localization has been correlated with poor prognosis in liver cancer patients. The knockout of HDAC4 in SK-HEP-1 cells disrupts these oncogenic processes, enabling systematic analysis of its role in chromatin remodeling, cell cycle control, and survival signaling. This model is particularly valuable for exploring how HDAC4 integrates upstream signals from AMPK and oxidative stress pathways to modulate MEF2-dependent and p53-dependent transcriptional programs that govern hepatic cell fate.
This HDAC4 knockout cell product is suited for a range of investigational applications, including Western blotting to confirm protein loss, RT-qPCR to measure consequential gene expression changes, and ChIP-qPCR to assess histone acetylation states at target loci. Functional assays such as cell viability assays, caspase-3/7 activation for apoptosis, and migration assays can reveal phenotypic outcomes of HDAC4 disruption. The cells also serve as a controlled genetic background for HDAC inhibitor sensitivity screening, aiding in the development of epigenetic therapies. Researchers focused on the intersection of chromatin regulation and liver cancer will find this model instrumental. For further details and technical support, please contact Ascent Research.
