The JPH1 Knockout Jurkat Polyclonal Cells represent a CRISPR/Cas9-edited polyclonal knockout cell population derived from the Jurkat T lymphocyte line, designed for targeted disruption of the JPH1 gene encoding junctophilin-1. These polyclonal cells provide a heterogeneous knockout model that retains the genomic diversity inherent to polyclonal editing, enabling robust investigation of JPH1 functional loss within a well-characterized T cell context.
Jurkat cells are an immortalized human T lymphocyte line established from the peripheral blood of a 14-year-old male with acute lymphoblastic leukemia. Widely employed as a model for T cell signaling and leukemia, Jurkat cells exhibit characteristic T cell receptor (TCR)-mediated activation responses, including calcium flux, NFAT nuclear translocation, and cytokine production. This background makes them particularly suited for studying calcium-dependent signal transduction pathways and their dysregulation in immune disorders.
JPH1 encodes junctophilin-1, a structural protein that forms junctional complexes tethering the endoplasmic reticulum to the plasma membrane, thereby maintaining the close membrane apposition required for efficient store-operated calcium entry (SOCE). JPH1 interacts directly with key SOCE components STIM1 and ORAI1 and is regulated upstream by MEF2 transcription factors and TCR stimulation. Downstream of JPH1-mediated calcium influx, calmodulin and calcineurin are activated, leading to dephosphorylation and nuclear translocation of NFAT transcription factors, which drive cytokine gene expression. Additional interacting factors include ryanodine receptors and L-type calcium channels, placing JPH1 at a critical node of the calcium signaling network.
In the Jurkat T cell model, disruption of JPH1 disrupts ER?Cplasma membrane junctional integrity, resulting in impaired SOCE and attenuated NFAT activation. This loss-of-function phenotype underscores the dependence of T cell calcium signaling on proper junctophilin-1?Cmediated membrane architecture. The model therefore offers a physiologically relevant system for dissecting the structural determinants of calcium microdomains and their impact on T cell activation, differentiation, and effector functions.
Typical research applications include calcium imaging using Fluo-4 or Fura-2 to assess calcium flux dynamics, flow cytometric analysis of NFAT nuclear translocation and cytokine production, western blotting for JPH1 and downstream effectors, and direct measurement of store-operated calcium entry. These cells are valuable for screening modulators of SOCE, investigating T cell-mediated autoimmune mechanisms, and exploring calcium signaling pathways in cancer immunotherapy contexts. For additional information, please contact Ascent Research.
