The MARCKS Knockout AGS Polyclonal Cells are a CRISPR/Cas9-edited heterogeneous population of human AGS gastric adenocarcinoma cells harboring targeted disruption of the MARCKS gene. This polyclonal knockout model maintains the epithelial, adherent nature of the parental AGS line and provides a loss-of-function system for investigating MARCKS-dependent biological processes in a cancer-relevant background.
The AGS cell line, derived from a human gastric adenocarcinoma, is widely utilized as an in vitro model for gastric cancer research. These epithelial cells display adherent monolayer growth and respond to growth factors such as EGF and PDGF, enabling studies of oncogenic signaling, cell migration, and invasion. Their transformed phenotype makes them particularly useful for assessing molecular determinants of gastric cancer metastasis.
MARCKS is an actin-crosslinking protein that sequesters PIP2 at the plasma membrane, modulating cytoskeletal dynamics and membrane-cytoskeleton adhesions. Its function is regulated through phosphorylation by protein kinase C (PKC) in response to upstream receptor tyrosine kinases, including EGFR and PDGFR, as well as Ca2+/calmodulin signaling. Upon PKC-mediated phosphorylation, MARCKS releases PIP2 and dissociates from the membrane, promoting actin remodeling, focal adhesion turnover, cell motility, and exocytosis. Key molecular interactions include direct binding to F-actin, calmodulin, and PIP2, positioning MARCKS as a central integrator of growth factor signals with cytoskeletal effector pathways.
In AGS gastric adenocarcinoma cells, MARCKS contributes to aggressive phenotypes such as enhanced migration and invasion. Disruption of MARCKS in this polyclonal knockout population impairs actin crosslinking and PIP2 sequestration, leading to defective cell spreading, reduced directional motility, and attenuated secretion. This model allows dissection of MARCKS function in EGF- and PDGF-stimulated migration, and its role in coordinating PKC and PI3K/Akt signaling. The cells are also valuable for exploring crosstalk with small GTPases such as Rac and Cdc42 that control lamellipodia formation and cell polarity.
Research applications include transwell migration and invasion assays, wound-healing scratch assays, and live-cell imaging of motility dynamics. The cells can be used for cell adhesion and spreading studies, immunofluorescence to examine actin cytoskeletal organization and focal adhesions, and secretion assays to evaluate MARCKS-mediated exocytosis. Western blotting and phospho-specific antibody detection enable assessment of MARCKS expression and PKC-dependent phosphorylation. For additional information or assay support, please contact Ascent Research.
