The ALB Knockout AGS Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout population generated from the AGS human gastric adenocarcinoma cell line, in which the ALB gene encoding albumin has been disrupted. This polyclonal product provides a mixed population of knockout cells, avoiding clonal artifacts and offering a robust loss-of-function model for investigating albumin-related biology.
AGS cells are a widely used epithelial model of gastric adenocarcinoma, originally derived from a patient stomach. They are instrumental in studying gastric carcinogenesis, H. pylori infection dynamics, and host-pathogen interactions, and their well-characterized growth properties make them an ideal host for genetic perturbation.
Albumin is the predominant plasma protein, essential for maintaining colloidal osmotic pressure and serving as a carrier for hydrophobic molecules including fatty acids, hormones, and drugs. Its expression is regulated by transcription factors HNF1, HNF3, C/EBP, and modulated by insulin, glucocorticoids, and inflammatory cytokines such as IL-6 and TNF-alpha. Albumin interacts with several key binding partners: FcRn controls its recycling and systemic persistence; gp60 (albondin) mediates endothelial transcytosis; and SPARC modulates extracellular matrix interactions. These molecular associations drive pathways like FcRn-mediated recycling, gp60-dependent endocytosis, and the formation of albumin-fatty acid complexes, ultimately governing ligand biodistribution and cellular uptake.
In the AGS background, which lacks endogenous albumin expression, this knockout model eradicates any residual ALB activity, creating a clean genetic null for functional studies. It enables researchers to examine how exogenous albumin influences gastric cancer cell behavior, such as transcytosis through the epithelial barrier, drug delivery mediated by gp60, and tumor microenvironment crosstalk via SPARC. Additionally, the knockout facilitates serum-free culture optimization by eliminating confounding variables from albumin in serum, permitting refined analysis of nutrient and signaling requirements.
Typical applications include quantitative albumin uptake and transcytosis assays employing fluorescent or radiolabeled ligands, fatty acid uptake measurements, and drug binding experiments for nanoparticle or conjugate delivery systems. The model is valuable for H. pylori infection studies, where albumin status may affect bacterial adhesion or host responses, and for modeling the tumor microenvironment, particularly interactions involving SPARC and gp60. Transcriptomic profiling via RNA-seq can reveal ALB-dependent pathways, while standard validation uses western blotting, albumin ELISA, and immunofluorescence. For further details or technical assistance, please contact Ascent Research.
