The LACTB Knockout SK-HEP-1 Polyclonal Cells product features a polyclonal CRISPR/Cas9-edited population of SK-HEP-1 cells in which the LACTB gene has been disrupted. This heterogeneous knockout pool circumvents clonal selection biases, making it ideal for population-level biochemical studies, drug screening, and functional genomics experiments. As a loss-of-function model, it provides a reliable platform for dissecting LACTB-dependent signaling pathways and phenotypic outcomes in a human liver sinusoidal endothelial-like context.
The host SK-HEP-1 cell line was established from a liver adenocarcinoma and displays hallmark endothelial features, including cobblestone morphology, expression of endothelial markers, and functional sinusoidal characteristics. Widely employed as a surrogate for liver sinusoidal endothelial cells, SK-HEP-1 enables investigation of endothelial biology, tumor angiogenesis, and cancer cell-endothelium interactions. This background is particularly advantageous for studying liver cancer pathobiology, where endothelial-like attributes intersect with malignant transformation within the hepatic niche.
LACTB is a p53-target gene that encodes a mitochondrial intermembrane space protein structurally related to ??-lactamases. Upon p53 activation, LACTB is upregulated and interacts with phosphatidylserine decarboxylase (PISD) on the inner mitochondrial membrane. This interaction alters phosphatidylethanolamine metabolism, remodeling mitochondrial membrane architecture and lowering the threshold for cytochrome c release. Released cytochrome c promotes apoptosome formation and downstream activation of caspase-9 and executioner caspases-3 and -7, culminating in apoptotic cell death. Additional interactions with mitochondrial inner membrane proteins further modulate this process, positioning LACTB as a critical node connecting p53 activity, lipid homeostasis, and apoptosis.
Within the SK-HEP-1 cell system, eliminating LACTB function allows precise dissection of its tumor-suppressive mechanisms in a liver cancer-relevant background. The knockout model facilitates examination of how LACTB deficiency influences p53-mediated apoptosis, mitochondrial phospholipid composition, and cellular responses to chemotherapeutic agents or metabolic stress. Given the endothelial-like phenotype of SK-HEP-1, this tool also supports research into the roles of LACTB in hepatic sinusoidal endothelial biology and its potential contribution to the vascular abnormalities observed in hepatocellular carcinoma and metabolic liver diseases.
Researchers can apply this polyclonal knockout cell pool in a variety of experimental workflows. Validation of LACTB disruption is achievable by Western blotting, RT-qPCR, and Surveyor nuclease assay or targeted sequencing. Mitochondrial isolation combined with membrane potential measurement and cytochrome c localization via immunofluorescence reveals mitochondrial defects. Co-immunoprecipitation experiments confirm LACTB interaction with PISD, while lipidomic profiling uncovers changes in mitochondrial phospholipid species. Functional assays, including caspase-3/7 activity, TUNEL staining, and migration/invasion tests, link molecular changes to apoptotic sensitivity and metastatic potential. For further inquiries or customized support, please contact Ascent Research.
