The ALB Knockout 769-P Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout population derived from the human 769-P renal epithelial cell line, designed to disrupt expression of the ALB gene. This heterogeneous pool of gene-edited cells carries targeted disruptions in ALB, enabling loss-of-function studies without clonal isolation. Suitable for investigations requiring robust representation of knockout phenotypes, these cells serve as a versatile platform for examining albumin-dependent processes in a kidney-derived background.
The 769-P cell line is an adenocarcinoma-derived epithelial model from human clear cell renal cell carcinoma, widely used in renal cancer research. Exhibiting proximal tubular epithelial features, 769-P cells facilitate studies on renal cell carcinoma biology, including growth factor signaling and metabolic dysregulation. Their clinically relevant genetic background provides a context for exploring gene function in kidney cancer, and with ALB disruption, they become a unique tool for dissecting albumin??s roles in renal physiology and pathology.
ALB encodes serum albumin, a major carrier protein for fatty acids, hormones, and drugs, and a key determinant of plasma oncotic pressure and antioxidant defense. Albumin expression is regulated by transcription factors HNF1A and HNF4A, and by cytokines such as IL-6 and TNF, as well as insulin and glucocorticoids. Downstream, albumin interacts with megalin and cubilin for receptor-mediated endocytosis in proximal tubules, and with FcRn for recycling and transcytosis. Additionally, it binds SPARC and GP60, modulating extracellular matrix interactions and caveolae-mediated transport. Disruption of ALB eliminates these functional interactions, offering a system to study ligand trafficking and redox balance.
Although albumin is primarily hepatocyte-derived, its potential ectopic expression in renal cells highlights the significance of ALB knockout in 769-P cells. Loss of albumin may disrupt autocrine signaling and reabsorption pathways mediated by the megalin-cubilin complex and CLIC/GEEC endocytosis. In clear cell renal cell carcinoma, where endocytic trafficking is often rewired, this model provides a clean background to investigate albumin handling and its consequences on tumor cell homeostasis. Furthermore, absence of albumin??s antioxidant activity sensitizes cells to oxidative stress, aiding in studies of redox-dependent cancer phenotypes.
These polyclonal knockout cells are suited for diverse research applications, including dissection of albumin-mediated ligand transport, drug delivery studies, and assessment of oncotic pressure contributions in vitro. Researchers can employ western blotting, RT-qPCR, and albumin ELISA to confirm knockout and quantify downstream effects. Functional assays such as BODIPY-fatty acid uptake measure lipid trafficking, while ROS detection and oncotic pressure assays evaluate antioxidant and colloidal properties. This model is also valuable for generating albumin-deficient backgrounds in nephropathy research. For additional technical information or custom applications, please contact Ascent Research.
