The AAK1 Knockout SK-HEP-1 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout population derived from the SK-HEP-1 human liver adenocarcinoma cell line. This product features targeted disruption of the AAK1 gene, generating a loss-of-function model suitable for studying the roles of AAK1 in clathrin-mediated endocytosis and associated signaling pathways. The polyclonal format retains cell population heterogeneity, reflecting the diversity of edits and minimizing clonal artifacts.
The parental SK-HEP-1 cell line originates from the ascitic fluid of a patient with liver adenocarcinoma and exhibits a unique endothelial-like phenotype, expressing endothelial markers despite its epithelial tumor origin. This adherent line is widely used as a model for studying tumor?Cendothelial interactions, transendothelial migration, and hepatic carcinogenesis. Its dual characteristics make it particularly valuable for investigating how endocytic trafficking pathways, such as those regulated by AAK1, influence endothelial-like functions and cancer cell behavior.
AAK1 encodes a serine/threonine kinase that serves as a key regulator of clathrin-mediated endocytosis by phosphorylating the ??2 subunit (AP2M1) of the adaptor protein 2 (AP-2) complex. This phosphorylation event enhances the affinity of AP-2 for cargo motifs and promotes clathrin coat assembly, facilitating efficient internalization of transmembrane receptors. AAK1 is activated downstream of epidermal growth factor receptor (EGFR) stimulation and elevated membrane curvature, linking extracellular cues to endocytic machinery. The kinase directly interacts with the AP-2 complex, clathrin, Numb, and the Notch receptor, positioning it at a critical node for modulating multiple signaling pathways. Through control of receptor internalization, AAK1 influences the signaling output of EGFR and Notch, among others, making it a central player in cellular communication and homeostasis.
In the SK-HEP-1 background, disruption of AAK1 is expected to impair clathrin-dependent endocytosis of surface receptors such as EGFR and Notch, thereby altering downstream signaling cascades that drive proliferation, migration, and differentiation. Given the endothelial-like properties of SK-HEP-1 cells, this knockout provides a unique platform to dissect how endocytic deficits impact tumor?Cendothelial mimicry, angiogenesis, and transendothelial processes. The polyclonal nature of the population allows averaged assessment of cellular responses without the confounding influence of clonal adaptation, offering a physiologically relevant model for studying disease mechanisms associated with AAK1 dysfunction, including schizophrenia, viral entry, and neurodegeneration.
This product is ideally suited for a range of research applications, including elucidation of clathrin-mediated endocytosis dynamics, receptor trafficking studies, and investigation of Notch signaling in hepatic and endothelial-like contexts. Researchers can employ phospho-AP2M1 western blotting to confirm loss of AAK1 kinase activity, immunofluorescence to visualize diminished clathrin-coated pit formation, and transferrin or EGF uptake assays to quantify endocytic capacity. Additionally, the knockout cells support Notch reporter luciferase assays to probe signaling alterations and cell migration assays to assess functional consequences in a cancer-relevant model. For further details and technical support, please contact Ascent Research.
