The CD3E Knockout Ca Ski Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population with targeted disruption of the CD3E gene in the human cervical carcinoma cell line Ca Ski. This heterogeneous pool, generated without clonal selection, provides a versatile model for studying T-cell receptor (TCR) signaling components in a non-immune epithelial context.
Ca Ski is an adherent epithelial cell line established from a cervical epidermoid carcinoma, endogenously expressing HPV16 sequences and widely used in cervical cancer research. Although lacking native TCR expression, the introduction of CD3E knockout in this host offers a defined genetic background for investigating ectopic CD3E function or for use in co-culture systems where TCR signaling modules are reconstituted.
CD3E encodes the epsilon chain of the CD3 complex, a critical co-receptor required for TCR surface expression and signal transduction. Upon TCR engagement by peptide?CMHC, Src family kinases Lck and Fyn phosphorylate immunoreceptor tyrosine-based activation motifs (ITAMs) within CD3 chains, triggering recruitment and activation of ZAP70. ZAP70 phosphorylates the adaptor LAT, initiating a signaling cascade involving PLC??1, PKC??, and the MAPK pathway, leading to activation of transcription factors NFAT, NF-??B, and AP-1. These factors drive cytokine production and T-cell activation. CD3E knockout disrupts CD3 complex assembly, impairing downstream signaling and immune responses.
Although Ca Ski cells are not T-lineage, disrupting CD3E in this cervical carcinoma background provides a platform to dissect ectopic TCR signaling modules or to evaluate the role of CD3E in processes beyond canonical immune function, such as in cancer cell biology where TCR components can be aberrantly expressed. This model may reveal non-immune functions of CD3E or serve as a control for TCR signaling reconstitution experiments. Additionally, it can be used to assess off-target effects of immunotherapies targeting CD3 in a tumor cell context.
This polyclonal knockout model supports a range of research applications, including genetic and pharmacological screening for modifiers of TCR signaling, validation of protein interactions via co-immunoprecipitation or proximity ligation assays, and functional studies using ectopic expression systems. It is compatible with assays such as western blotting, RT-qPCR, flow cytometry, and RNA-seq to confirm CD3E disruption and downstream signaling effects. For further details on product validation and availability, please contact Ascent Research.
