The ACTA2 Knockout AGS Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population derived from the AGS human gastric adenocarcinoma epithelial cell line, in which the ACTA2 gene encoding alpha-smooth muscle actin (??-SMA) has been disrupted. This loss-of-function model provides a heterogeneous pool of cells with targeted ACTA2 disruption, eliminating functional ??-SMA expression without the bias of clonal selection. The polyclonal format is well-suited for examining population-level behaviors, including actin cytoskeleton remodeling, cell contractility, and TGF-beta-induced differentiation processes.
The AGS cell line is a widely employed model of human gastric adenocarcinoma, originally established from a primary tumor of a patient with poorly differentiated gastric carcinoma. These epithelial cells exhibit key characteristics of gastric cancer, including aberrant proliferation and responsiveness to growth factors such as TGF-beta. Under basal conditions, AGS cells express low levels of ACTA2, but TGF-beta stimulation robustly upregulates ??-SMA, driving a myofibroblast-like phenotype. This inducible system closely mimics aspects of epithelial?Cmesenchymal plasticity and CAF differentiation observed in the gastric tumor microenvironment, making the AGS background highly relevant for knockout studies of ACTA2-dependent processes.
ACTA2 encodes alpha-smooth muscle actin, a major actin isoform that forms the backbone of stress fibers in smooth muscle cells and myofibroblasts. Its expression is primarily controlled by the TGF-beta receptor/SMAD2/3 signaling axis, which activates serum response factor (SRF) and cofactors myocardin and MKL1; additionally, Hippo pathway effectors YAP and TAZ can transactivate the ACTA2 promoter. The ??-SMA protein interacts with actin-binding partners such as myosin, tropomyosin, alpha-actinin, filamin, and caldesmon to generate contractile force and maintain cytoskeletal architecture. Downstream, ACTA2 supports actin filament polymerization, focal adhesion turnover, cell migration, and matrix contraction.
Disruption of ACTA2 in AGS cells leads to a marked loss of mature actin stress fibers, severely impairing cell contractility and migration. Critically, TGF-beta-induced myofibroblast differentiation is blocked, as evidenced by failed upregulation of ??-SMA and reduced matrix remodeling capacity. This phenotype is directly relevant to gastric cancer biology, where ACTA2-expressing cancer-associated fibroblasts promote extracellular matrix stiffening, tumor invasion, and metastasis. The ACTA2 knockout model thus allows precise interrogation of how ??-SMA contributes to tumor?Cstroma crosstalk, fibrotic signaling, and actin-dependent signaling networks. Additionally, loss of ACTA2 attenuates downstream effectors in the focal adhesion pathway, providing insights into actin-centric mechanisms of gastric adenocarcinoma progression.
This polyclonal knockout product is suitable for diverse functional studies, including live-cell imaging of actin dynamics, quantitative cell migration and invasion assays, collagen gel contraction experiments, and detailed TGF-beta pathway analysis. Representative assays encompass western blotting for ACTA2 and downstream targets, immunofluorescence staining of F-actin, qPCR for ACTA2 transcripts after TGF-beta treatment, and phospho-specific detection of SMAD2/3. The population-based knockout design is also amenable to high-throughput screening of small molecules targeting myofibroblast differentiation or CAF function. For additional product information and support, contact Ascent Research.
