The MAPK14 Knockout Raji Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population designed to disrupt MAPK14 gene function in the human Raji B lymphocyte line. This loss-of-function model enables the study of p38?? MAP kinase signaling in a malignant B-cell context. The polyclonal knockout format provides a heterogeneous population of gene-edited cells and is suitable for bulk population-based assays including Western blotting for p38?? protein loss, phospho-p38 signaling analysis, and RT-qPCR for MAPK14 mRNA levels.
Raji is an EBV-positive B lymphoblastoid cell line derived from a Burkitt lymphoma patient, carrying the t(8;14) MYC translocation. As a widely used model for B-cell malignancies, Raji cells exhibit rapid proliferation and retain germinal center B-cell features. Their EBV-positive status and malignant phenotype make them relevant for investigating oncogenic signaling networks, particularly those intersecting the p38 MAPK pathway, implicated in viral latency and lymphomagenesis.
MAPK14 encodes p38??, a stress-activated serine/threonine kinase integrating signals from osmotic stress, UV radiation, and pro-inflammatory cytokines such as TNF?? and IL-1??. It is activated through dual phosphorylation by upstream MKK3 and MKK6, which are regulated by MAP3Ks TAK1 and ASK1. Activated p38?? phosphorylates downstream targets including transcription factors ATF2 and CREB, and the kinase MK2, modulating mRNA stability and apoptosis. p38?? also interacts with scaffold protein TAB1 and is negatively regulated by phosphatase MKP-1/DUSP1, serving as a central node in the p38 MAPK cascade coordinating cellular stress responses.
Knockout of MAPK14 in Raji B lymphocytes disrupts p38-dependent signaling critical for B-cell homeostasis and stress adaptation. Given Raji??s malignant origin, loss of p38?? can impact proliferation, cytokine production (e.g., IL-6, IL-10), and apoptosis regulation, providing a platform to dissect p38????s role in lymphoma biology. This model is valuable for exploring how p38?? influences NF-??B activity and MYC-driven transcriptional programs in EBV-positive B cells, potentially affecting survival and immune evasion.
Research applications include studying stress signaling in B lymphocytes, validating p38?? as a drug target in inflammatory diseases and lymphoma, and analyzing cytokine production via ELISA or Luminex. The polyclonal knockout population is suited for apoptosis assays (Annexin V), proliferation assays, NF-??B reporter assays, and flow cytometry for B-cell markers. Researchers can compare kinase-dependent and kinase-independent functions of p38?? and screen small-molecule p38 pathway inhibitors. For further details, please contact Ascent Research.
