The ITGA3 Knockout SK-HEP-1 Polyclonal Cells comprise a CRISPR/Cas9-edited polyclonal cell population derived from the SK-HEP-1 human hepatic sinusoidal endothelial cell line, in which the integrin subunit alpha-3 gene (ITGA3) has been disrupted. This knockout model provides a loss-of-function system for investigating the cellular roles of the ??3??1 integrin heterodimer without clonal selection, preserving the inherent heterogeneity of the parental line. The polyclonal format enables functional genomics, drug target validation, and signaling studies in a population context, avoiding potential artifacts from single-cell cloning.
The SK-HEP-1 host cell line was established from the ascitic fluid of a patient with liver adenocarcinoma and exhibits phenotypic characteristics of hepatic sinusoidal endothelial cells. These cells line the hepatic sinusoids and participate in critical physiological processes including endocytosis, immune surveillance, and maintenance of liver homeostasis. Their endothelial origin makes them particularly relevant for modeling cell-matrix interactions, transendothelial migration, and the hepatic microenvironment in both normal and disease states.
ITGA3 encodes the integrin ??3 subunit, which pairs exclusively with integrin ??1 (ITGB1) to form the laminin-binding receptor ??3??1. This heterodimer mediates adhesion to extracellular matrix proteins such as laminin isoforms, collagen IV, and fibronectin, and serves as a critical nexus for biomechanical and biochemical signaling. Upon ligand engagement, ??3??1 activates focal adhesion kinase (FAK/PTK2) and Src family kinases, leading to downstream activation of the PI3K-Akt-mTOR axis and small GTPases Rac1 and RhoA, thereby promoting cell migration, proliferation, and survival. Additionally, ??3??1 interacts with tetraspanins (CD9, CD81), uPAR, and EGFR, modulating signaling crosstalk. Upstream regulators include TGF-?? and EGF, which can modulate ITGA3 expression, while laminin and collagen matrices provide the primary adhesive cues.
Disruption of ITGA3 in SK-HEP-1 cells eliminates functional ??3??1 integrin, thereby impairing adhesion to laminin-rich substrates and abrogating FAK/Src and PI3K/Akt-mediated signaling cascades. In the context of hepatic sinusoidal endothelium, this loss-of-function model is instrumental for dissecting the contribution of ??3??1 to endothelial barrier function, transendothelial migration of cancer cells, and fibrotic responses. The model is particularly relevant for studying liver cancer metastasis, where integrin-mediated adhesion and signaling are often dysregulated, and for anti-integrin therapeutic screening.
These polyclonal knockout cells are well-suited for a range of experimental applications, including quantitative adhesion assays on laminin or collagen matrices, Boyden chamber migration and invasion assays, and flow cytometric analysis of surface integrin expression. Researchers can employ Western blotting and phospho-specific antibodies to assess FAK (Tyr397) and Akt (Ser473) phosphorylation status, co-immunoprecipitation to examine integrin complex integrity, and immunofluorescence to visualize focal adhesion dynamics. The model also supports RT-qPCR for ITGA3 transcript quantification, cell viability assays under stress conditions, and high-content screening for compounds targeting integrin signaling pathways. For additional information, technical support, or to place an order, please contact Ascent Research.
