The MAPK8 Knockout Raji Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population generated from the Raji cell line, providing a loss-of-function model for studying MAPK8 (JNK1) signaling. This product is designed to disrupt the MAPK8 gene using CRISPR/Cas9-mediated gene disruption, resulting in a heterogeneous population of cells with targeted gene knockout. As a polyclonal pool, it reflects the diversity of editing outcomes and is suitable for functional genomics studies where a uniform knockout is not required. The cells are provided as a suspension culture and are ready for downstream applications such as pharmacological inhibition assays or pathway analysis.
The Raji cell line is a well-established human B lymphocyte model derived from a Burkitt’s lymphoma patient. These lymphoblastoid suspension cells are EBV-positive and retain key features of B cells, including antigen presentation and immunoglobulin production. Widely used in immunology and oncology research, Raji cells serve as a robust system for investigating B cell signaling, lymphomagenesis, and immune responses. Their transformed phenotype and constitutive activation of survival pathways make them particularly relevant for studying stress-related kinase cascades and apoptotic regulation.
MAPK8 encodes the stress-activated serine/threonine kinase JNK1, which functions downstream of sequential kinase cascades initiated by upstream regulators such as MKK4, MKK7, MEKK1, and ASK1. Upon stimulation by cytokines like TNF-alpha and IL-1, or by environmental stresses including UV radiation and osmotic shock, JNK1 phosphorylates and activates transcription factors c-Jun and ATF2, leading to AP-1 complex formation. Additional downstream targets include p53 and Bcl-2 family proteins, linking JNK1 to apoptosis and cell survival decisions. JNK1 activity is also coordinated through interactions with scaffold proteins such as JIP1, JIP2, JIP3, and beta-arrestin. The canonical signaling axis??MEKK1 ?? MKK4/MKK7 ?? JNK1 ?? c-Jun ?? AP-1??highlights its central role in integrating stress signals to regulate gene expression programs controlling proliferation, differentiation, and inflammation.
In Raji B cells, MAPK8 signaling is implicated in the cellular response to extrinsic stressors and cytokines, influencing both survival and immune effector functions. The EBV-driven lymphoblastoid background provides a unique context to dissect how JNK1 modulates oncogenic signaling and apoptosis thresholds in B-cell malignancies. Disruption of MAPK8 in this model allows researchers to interrogate the kinase’s role in lymphoma cell survival, chemoresistance, and the interplay between viral latency and host stress pathways. Additionally, the model aids in exploring JNK1??s contribution to adaptive immunity, as Raji cells retain some capacity for antigen presentation and cytokine responsiveness.
This knockout cell population is ideally suited for detailed functional studies, including western blotting for phospho-JNK and its downstream targets, RT-qPCR analysis of AP-1 target genes, and apoptosis assays using Annexin V staining. Flow cytometry-based detection of phospho-c-Jun offers a quantitative readout of pathway activity, while proliferation and drug sensitivity assays facilitate screening of JNK inhibitors in a lymphoma-relevant context. The MAPK8 Knockout Raji Polyclonal Cells are a versatile tool for investigating stress kinase signaling in hematological malignancies, inflammatory disorders, and cancer drug development. For additional technical information and ordering details, please contact Ascent Research.
