The ARG1 Knockout AGS Polyclonal Cells product provides a CRISPR/Cas9-edited polyclonal knockout cell population targeting the ARG1 gene in the AGS human gastric adenocarcinoma cell line. This gene-edited cell pool offers a loss-of-function model to study arginase 1 biology in a gastric epithelial context. The polyclonal format enables the interrogation of heterogeneous knockout effects, closely resembling the diversity of genetic perturbations found in tumor microenvironments. Researchers can utilize this tool to dissect arginine metabolism and its downstream signaling consequences without clonal selection biases.
AGS cells are an adherent epithelial line originally established from a gastric adenocarcinoma of a 54-year-old female patient. This cell line is widely employed as a model for gastric adenocarcinoma and has been extensively used in studies of Helicobacter pylori infection and gastric carcinogenesis. AGS cells retain key features of gastric epithelium and respond to H. pylori virulence factors such as CagA, which is known to transcriptionally upregulate ARG1. The AGS host therefore provides a physiologically relevant platform for investigating arginase-dependent mechanisms in gastric cancer.
ARG1 encodes arginase 1, a manganese-dependent enzyme that hydrolyzes L-arginine to L-ornithine and urea, pivotal in the urea cycle. ARG1 competes with nitric oxide synthases (NOS1, NOS2, NOS3) for the common substrate arginine, thereby controlling nitric oxide production and downstream polyamine biosynthesis via ornithine decarboxylase (ODC1). In AGS cells, ARG1 expression is induced by upstream signals including IL-4, IL-13, STAT6, TGF-??, and H. pylori CagA, while PPAR?? acts as a negative regulator. Knockout of ARG1 disrupts this regulatory network, increasing intracellular arginine availability, promoting NO synthesis, and reducing polyamine and proline generation, ultimately affecting cell proliferation and T-cell-mediated immune responses.
Disruption of ARG1 in AGS cells recapitulates key aspects of arginine metabolic reprogramming observed in gastric tumors. By removing arginase activity, this model enhances nitric oxide signaling and diminishes immunosuppressive polyamine production, thereby reversing a major mechanism of tumor immune evasion associated with myeloid-derived suppressor cells. Furthermore, the knockout sensitizes cells to arginine-dependent pathways and permits study of arginine depletion effects. This system serves as a powerful tool to probe the intersection of arginine metabolism, H. pylori pathogenesis, and gastric cancer cell-autonomous effects, including modulation of the tumor microenvironment and immune surveillance.
The ARG1 Knockout AGS Polyclonal Cells are suited for a wide range of functional assays, including arginase activity measurements, urea quantification, nitric oxide detection via Griess assay, and polyamine profiling by HPLC. Co-culture experiments with T cells can assess impacts on immune suppression, while proliferation assays reveal changes in cell growth kinetics. Additionally, these cells are instrumental for screening pharmacological arginase inhibitors and dissecting ARG1 roles in H. pylori-driven pathology. For further technical details or to explore custom applications, please contact Ascent Research.
