ELANE Knockout SK-HEP-1 Polyclonal Cells are a population of SK-HEP-1 cells that have been subjected to CRISPR/Cas9-mediated disruption of the ELANE gene. This product consists of a polyclonal pool of edited cells, providing a heterogeneous knockout model that avoids clonal artifacts and reflects population-level functional studies. The ELANE gene encodes neutrophil elastase, a serine protease with critical roles in extracellular matrix degradation and innate immunity. By targeting ELANE, these cells enable systematic loss-of-function analyses in an endothelial context without the confounding effects of monoclonal selection.
The SK-HEP-1 cell line is an established endothelial model originally isolated from the ascitic fluid of a male patient with liver adenocarcinoma. Despite its tumorigenic origin, SK-HEP-1 cells exhibit hallmark endothelial features, including the expression of endothelial markers and the ability to form tube-like structures in vitro, making them a widely used surrogate for liver sinusoidal endothelial cells. This line is particularly valued in angiogenesis and vascular biology research due to its robust proliferation, ease of transfection, and well-documented angiogenic responses.
Neutrophil elastase, encoded by ELANE, is a chymotrypsin-like serine protease stored in azurophilic granules of neutrophils and released upon degranulation. It cleaves a broad spectrum of substrates, including elastin, collagen, and fibronectin, thereby facilitating extracellular matrix remodeling and cell migration. Beyond its proteolytic activity, ELANE participates in pro-inflammatory signaling by processing cytokines such as IL1B and TNF, and it modulates innate immune receptors like CD14 and TLR4. ELANE expression is transcriptionally regulated by CEBPA and SPI1, and its activity is influenced by the CSF3/CSF3R/JAK2/STAT3 axis, which governs granulopoiesis. Endogenous inhibitors, such as SERPINA1 (alpha-1 antitrypsin), SLPI, and A2M, tightly control its enzymatic function to prevent tissue damage.
In the context of SK-HEP-1 endothelial cells, disruption of ELANE provides a unique tool to dissect the non-canonical roles of neutrophil elastase in vascular biology. Although ELANE is predominantly associated with neutrophils, its substrates and interacting partners are abundant in the endothelial microenvironment. The knockout model enables the examination of how loss of elastase-mediated ECM degradation impacts endothelial cell migration, tube formation, and angiogenic sprouting. Moreover, it facilitates the study of protease-dependent signaling cascades that intersect with inflammatory and fibrotic pathways, which are relevant to liver sinusoidal pathologies and tumor angiogenesis.
Researchers can apply ELANE Knockout SK-HEP-1 Polyclonal Cells in diverse experimental paradigms. For drug discovery, the absence of neutrophil elastase creates a negative-control system for evaluating the specificity and potency of elastase inhibitors, while tube formation and scratch wound assays assess the functional consequences on angiogenesis and migration. Gelatin zymography and elastase activity assays confirm the loss of enzymatic function, and RT-qPCR or Western blotting validates gene disruption. Additionally, these cells serve as a platform to investigate endothelial dysfunction associated with severe congenital neutropenia or cyclic neutropenia, where ELANE mutations are pathogenic. By pairing with cytokine stimulation or co-culture with immune cells, the model aids in dissecting protease-mediated crosstalk in inflammation and fibrosis. For questions or to obtain this product, please contact Ascent Research.
