The CSRP1 Knockout Raji Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout population derived from the Raji B lymphocyte cell line. This loss-of-function model disrupts the CSRP1 gene, facilitating studies of its roles in transcriptional cofactor activity, cytoskeletal regulation, and tumor suppression. The polyclonal cells offer a heterogeneous knockout background that avoids clonal selection biases, providing a robust system for functional genomics investigations.
Raji cells, a human B lymphocyte line originating from Burkitt lymphoma, are EBV-positive and grow in suspension. These cells are established models for antibody production, adaptive immune responses, and B-cell lymphoma research. Their well-characterized signaling networks and rapid proliferation make them particularly suitable for gene perturbation studies aimed at understanding lymphomagenesis and therapeutic responses.
CSRP1 encodes a LIM domain transcriptional cofactor that integrates TGF-beta and mechanical signals through interactions with serum response factor (SRF), GATA4, GATA6, and beta-actin (ACTB). It transcriptionally regulates cytoskeletal and cell cycle genes, including ACTA2, CNN1, MYOCD, and CDKN1A. CSRP1 functions downstream of TGFBR1 and SMAD2/3/4 complexes, activated by TGF-beta, SRF, and mechanical stretch. This cofactor promotes actin cytoskeleton organization and focal adhesion assembly, while mediating tumor-suppressive effects via CDKN1A induction. Knockout of CSRP1 disrupts these interconnected pathways, potentially impairing TGF-beta-mediated growth inhibition.
Within Raji B lymphocytes, CSRP1 disruption compromises transcriptional programs controlling adhesion, migration, and survival. This is particularly relevant as CSRP1 is implicated in B-cell lymphoma, and its loss may modulate lymphoma cell behavior by altering TGF-beta-dependent tumor suppressor functions. The EBV-positive background adds an additional dimension, enabling exploration of oncogenic interactions between viral latency and CSRP1-mediated pathways.
Researchers can utilize this model for detailed functional analyses, including proliferation, migration, and invasion assays. Standard readouts involve Western blotting for CSRP1, RT-qPCR for downstream targets such as ACTA2 and CDKN1A, and phalloidin staining to visualize actin filament organization. TGF-beta stimulation with phospho-SMAD analysis permits assessment of signaling integrity, while drug sensitivity experiments enable resistance profiling. Together, these applications support investigations into tumor suppressor mechanisms and B-cell lymphoma biology. For additional information, please contact Ascent Research.
