ACTN4 Knockout Jurkat Polyclonal Cells comprise a CRISPR/Cas9-edited polyclonal population with targeted disruption of the ACTN4 gene in the Jurkat T lymphocyte line. This heterogeneous knockout pool eliminates functional alpha-actinin-4 protein, enabling population-level studies of loss-of-function phenotypes without clonal selection. The model is designed for investigating actin cytoskeleton regulation, adhesion dynamics, and associated signaling pathways in a leukemic T cell context.
The Jurkat host cell line originates from a 14-year-old male with acute T cell leukemia and is widely used to study T cell receptor signaling, cytokine production, and apoptosis. Its leukemic background and constitutively active proximal TCR signaling components make it an ideal background for examining oncogenic and immunological pathways relevant to T-cell acute lymphoblastic leukemia. Jurkat cells respond robustly to stimuli such as phorbol myristate acetate and ionomycin, facilitating diverse functional assays.
Alpha-actinin-4 is an actin-bundling protein that crosslinks F-actin filaments and scaffolds focal adhesion complexes by interacting with vinculin, zyxin, and integrin ??1 (CD29). ACTN4 is regulated by upstream factors including PI3K, AKT, TGF-??, RAC1, and SRC kinases, and it mediates downstream effects such as F-actin stabilization, MMP-9 upregulation, and NF-??B activation via p65 (RELA). Loss of ACTN4 disrupts actin architectures and uncouples mechanical inputs from signal transduction through FAK, RhoA, and IKK, thereby affecting transcriptional programs driven by Snail and E-cadherin.
In T cells, ACTN4 supports integrin-mediated adhesion and polarized migration essential for immune surveillance and leukemic dissemination. ACTN4 knockout Jurkat cells show impaired actin remodeling, reduced adhesion to extracellular matrix, and attenuated transendothelial migration. This model is particularly valuable for probing invasion mechanisms in T-cell acute lymphoblastic leukemia, as ACTN4-dependent NF-??B signaling and MMP-9 secretion promote tissue infiltration. Additionally, diminished PI3K/AKT activity in these knockout cells may alter survival and proliferation, offering a tool for testing inhibitors of adhesion-dependent leukemia progression.
Applications include Western blotting and RT-qPCR for knockout validation, immunofluorescence and phalloidin staining to detect F-actin disorganization, and Transwell migration/invasion assays to quantify motility defects. Phospho-specific analysis of AKT and p65, co-immunoprecipitation of ACTN4-interacting proteins, and reporter assays (NF-??B, AP-1) facilitate mechanistic dissection. The polyclonal population is suitable for drug target validation in anti-metastatic research and for studying transcriptional coregulation by actin-binding proteins. For further information, please contact Ascent Research.
