The PDE8B Knockout Raji Polyclonal Cells represent a CRISPR/Cas9-edited polyclonal knockout cell population in which the gene encoding phosphodiesterase 8B (PDE8B) has been disrupted in the Raji human Burkitt lymphoma B-cell line. This pooled loss-of-function model provides a genetically heterogeneous cell pool derived from bulk editing, enabling robust assessment of PDE8B-dependent phenotypes without clonal selection artifacts.
The Raji cell line is a well-characterized Epstein-Barr virus (EBV)-positive Burkitt lymphoma-derived B lymphocyte model, widely utilized in immunological and oncological research. These cells retain features of mature B cells, including surface immunoglobulin expression and capacity for antigen presentation. Their rapid proliferation and defined genetic background make them a versatile host for studying B-cell signaling pathways and lymphomagenesis.
PDE8B is a high-affinity cAMP-specific phosphodiesterase that hydrolyzes cAMP to AMP, terminating cAMP signals. It functions downstream of G??s-coupled receptors and adenylyl cyclases, and its activity is regulated by PKA-mediated phosphorylation feedback. In the cAMP/PKA cascade, cAMP activates PKA, which phosphorylates CREB and other targets. PDE8B interacts with the I??B kinase complex and may localize via AKAPs. Disruption of PDE8B results in elevated cAMP and enhanced PKA activity, affecting CREB phosphorylation and gene expression.
In the context of Raji B lymphoma cells, PDE8B knockout is predicted to perturb basal and stimulated cAMP dynamics, impacting processes such as proliferation, apoptosis, and differentiation. Given the emerging links between cAMP signaling and B-cell malignancies, this cellular model offers a relevant platform to dissect the role of PDE8B in lymphomagenesis. Additionally, while PDE8B mutations are associated with adrenocortical pathologies like micronodular adrenal hyperplasia and Cushing syndrome, its potential involvement in immune cell function warrants investigation, making this model valuable for exploring B-cell-intrinsic cAMP regulation.
Key applications include detailed interrogation of cAMP/PKA signaling in lymphoma biology using assays such as cAMP ELISA, PKA activity measurements, and phospho-CREB Western blotting. The polyclonal population is suitable for screening PDE8B-selective inhibitors via cell viability (MTT) or apoptosis (annexin V) readouts, and for quantifying cAMP-dependent gene expression by RT-qPCR. Flow cytometric analysis can assess effects on B-cell surface markers. This knockout model empowers functional genomics, drug discovery, and signal transduction studies. For further information or to discuss custom projects, please contact Ascent Research.
