The GSN Knockout HT29 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal population with disruption of the GSN gene, encoding gelsolin. Generated via CRISPR/Cas9-mediated gene targeting in HT29 colorectal adenocarcinoma cells, these polyclonal cells comprise a heterogeneous pool with diverse editing events, offering a robust loss-of-function system free from clonal bias. This mixed population enables investigation of gelsolin??s collective impact in a physiologically relevant intestinal epithelial background.
HT29 is a widely used epithelial cell line derived from a primary colorectal adenocarcinoma in a 44-year-old female. Known for its intestinal barrier properties and differentiation capacity, HT29 serves as a standard in vitro model for colon cancer research, including studies on tumor progression, cell polarity, and drug responses. Its adherent growth and junction formation make it ideal for examining cytoskeletal regulators in metastasis and epithelial integrity.
Gelsolin severs and caps actin filaments in a calcium- and PIP2-dependent manner, regulating cytoskeletal dynamics. Upstream factors EGF, TGF-??, and Caspase-3 modulate its activity, while PIP2 and TNF-?? influence its membrane association. Gelsolin interacts with actin, cofilin, tropomyosin, and the Arp2/3 complex, and integrates signals from Rho GTPases (RhoA, Rac1, Cdc42) and integrin?CFAK?CSrc pathways. Caspase-3 cleavage generates a pro-apoptotic fragment, linking gelsolin to apoptosis. Its role in actin remodeling affects cell migration, invasion, and survival signaling downstream of PI3K-Akt.
In HT29 colorectal adenocarcinoma, GSN knockout disrupts actin organization, potentially impairing migration, invasion, and apoptotic responses. Gelsolin overexpression in some metastatic colorectal cancers suggests context-dependent functions; knockout studies can clarify its tumor-suppressive or oncogenic roles. The polyclonal pool permits bulk analysis of altered signaling??such as focal adhesion dynamics and caspase-mediated apoptosis??without clonal variation. This model is valuable for studying how actin remodeling influences epithelial barrier disruption, anoikis resistance, and chemosensitivity.
Assays include Transwell migration/invasion, wound healing, and phalloidin/immunofluorescence staining for actin visualization. Gene and protein expression are quantified via RT-qPCR and Western blotting, while co?immunoprecipitation confirms actin interactions. Apoptosis is assessed by Annexin V flow cytometry, and cell cycle changes via propidium iodide staining. The model supports drug sensitivity screening and high-content analysis for cytoskeleton?targeting compounds. For further technical details or customized applications, please contact Ascent Research.
