The GSN knockout Jurkat polyclonal cells are a CRISPR/Cas9-edited polyclonal knockout cell population derived from the Jurkat human T-lymphocyte line, designed to disrupt endogenous gelsolin (GSN) gene expression. This gene-edited product provides a loss-of-function model for investigating gelsolin’s roles without alterations associated with clonal selection, making it suitable for studies requiring a heterogeneous knockout background. The polyclonal nature preserves genetic diversity typically found in cell populations, allowing analysis of gene function at the population level rather than relying on a single edited clone.
Jurkat cells are an immortalized human T-cell line established from an acute T-cell leukemia patient. They are widely used as a model for T-cell receptor (TCR) signaling, apoptosis, and acute lymphoblastic leukemia (ALL) research. These cells exhibit robust signaling responses and are characterized by a well-defined molecular framework for studying immune activation, calcium flux, and cytoskeletal reorganization. The Jurkat background enables dissection of signaling pathways relevant to normal T-cell physiology and leukemic transformation, offering a tractable system for functional genomics and pharmacological screening.
GSN encodes gelsolin, a calcium-regulated actin-binding protein that severs and caps actin filaments, thereby controlling cytoskeletal dynamics, cell motility, and apoptosis. Gelsolin activity is modulated by upstream regulators including Ca2+ influx, phosphatidylinositol 4,5-bisphosphate (PIP2), Src kinase, and EGF signaling, as well as by caspase-3 and caspase-7 cleavage, which generates a pro-apoptotic fragment. Downstream, gelsolin promotes actin filament disassembly, cytochrome c release from mitochondria, and influences focal adhesion turnover and membrane ruffling. It interacts with actin, PIP2, tropomyosin, vinculin, and flightless-1, and participates in the PI3K-Akt pathway and apoptotic cascades mediated by Bcl-2 family proteins, Apaf-1, and caspase-9.
In the Jurkat T-cell context, GSN knockout disrupts actin filament dynamics, impairing cytoskeletal reorganization essential for T-cell receptor signaling, immunological synapse formation, and cell migration. Loss of gelsolin’s severing and capping functions alters membrane ruffling and may compromise TCR-mediated activation events. Additionally, because gelsolin participates in caspase-3-mediated apoptosis, its knockout can modify mitochondrial integrity and cytochrome c release, potentially attenuating apoptotic response to physiological stimuli or chemotherapeutic agents. This model therefore provides a platform to dissect gelsolin’s dual roles in cytoskeletal regulation and cell death in a T-cell lineage.
Researchers can employ these polyclonal knockout cells to investigate T-cell activation, actin cytoskeleton remodeling, apoptosis mechanisms, and cancer cell migration. Representative assays include flow cytometric analysis of F-actin content and cell size, Western blotting for caspase cleavage products, transwell migration assays, Annexin V apoptosis detection, and confocal imaging of actin structures. Co-immunoprecipitation of gelsolin partners such as actin and vinculin, along with RT-qPCR for downstream target genes, can further elucidate signaling networks. The model is also suited for drug sensitivity screening and study of immunological synapse dynamics. For further technical details, please contact Ascent Research.
