The ITSN1 Knockout Jurkat Polyclonal Cells comprise a CRISPR/Cas9-edited polyclonal knockout cell population in which the ITSN1 (intersectin 1) locus has been targeted for gene disruption. This polyclonal product format preserves the inherent genetic heterogeneity of the knockout pool, providing a robust loss-of-function model that avoids the clonal artifacts sometimes associated with single-cell isolates. The CRISPR/Cas9-mediated disruption of ITSN1 enables constitutive elimination of the ITSN1 protein, allowing researchers to study the consequences of ITSN1 deficiency across a mixed population of T lymphocyte cells.
The knockout model is established in the Jurkat host cell line, an immortalized human T lymphocyte line originally derived from a patient with T cell acute lymphoblastic leukemia. Jurkat cells are widely used as a prototypical model for T cell signaling, activation, and leukemia biology. Their well-characterized signaling networks, including robust TCR signaling and endocytic machinery, make them an ideal platform for interrogating the functions of scaffold and adaptor proteins like ITSN1. The polyclonal ITSN1 knockout Jurkat cells retain the fundamental characteristics of the parental line while lacking ITSN1 expression, enabling direct comparison in functional assays.
ITSN1 encodes a multi-domain scaffold protein that coordinates endocytosis, actin cytoskeleton dynamics, and intracellular signal transduction. In T lymphocytes, ITSN1 is rapidly recruited to the activated T cell receptor (TCR) complex, where it serves as a critical adaptor linking proximal TCR signaling to downstream actin remodeling and endocytic events. Mechanistically, ITSN1 interacts with the E3 ubiquitin ligase Cbl and the guanine nucleotide exchange factor SOS, and it activates the N-WASP?CCdc42 axis to promote actin polymerization. Additionally, ITSN1 associates with dynamin and epsin to facilitate clathrin-mediated endocytosis. Thus, ITSN1 integrates signals from upstream regulators such as antigen-stimulated TCR, Ephrin receptors, and EGF receptor, and transmits them to effectors including Cdc42, N-WASP, and dynamin. In the broader signaling network, ITSN1 functions downstream of ZAP70 and LAT and upstream of Vav1, ultimately modulating actin dynamics and endocytic trafficking essential for T cell function.
In the Jurkat T cell context, ITSN1 is particularly relevant to immune synapse formation, sustained TCR signaling, and regulation of surface receptor levels via endocytosis. Disruption of ITSN1 is expected to impair the coupling of TCR engagement to actin reorganization, potentially altering T cell activation thresholds, cytokine production, and proliferation. Moreover, since ITSN1 participates in endocytic recycling and degradation of the TCR complex, its knockout may affect signal attenuation and receptor expression patterns. These cellular processes are fundamental to normal T cell physiology and are often dysregulated in T cell acute lymphoblastic leukemia, making the ITSN1 knockout Jurkat model a valuable tool for dissecting the molecular underpinnings of leukemogenesis and immune cell function.
The ITSN1 Knockout Jurkat Polyclonal Cells are suited for a broad range of experimental applications. Researchers can employ these cells in Western blotting to confirm ITSN1 loss and assess downstream signaling changes, flow cytometry to monitor TCR surface expression, and endocytosis assays using transferrin uptake to evaluate general endocytic capacity. Actin polymerization assays and co-immunoprecipitation experiments enable dissection of ITSN1 interactions with Cbl, N-WASP, and dynamin. Phospho-signaling analyses for ZAP70 and ERK activation, cell proliferation assays, and drug sensitivity studies further extend the utility of this model in T cell biology and leukemia research. For additional technical specifications or customization options, please contact Ascent Research.
