The EFNB1 Knockout NCI-H1975 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population originating from the NCI-H1975 human lung adenocarcinoma cell line, engineered for targeted disruption of the EFNB1 locus. This knockout model abolishes ephrin-B1 protein expression, providing a versatile tool for studying ephrin-dependent bidirectional signaling in a non-small cell lung cancer (NSCLC) context. The polyclonal format preserves genetic heterogeneity while ensuring functional gene knockout, suitable for pooled assays and population-level analyses without single-cell cloning artifacts.
The parental NCI-H1975 cell line is derived from a human lung adenocarcinoma and harbors the activating EGFR L858R mutation, rendering it dependent on EGFR signaling for proliferation and survival. This well-characterized NSCLC model is widely used to investigate oncogenic kinase signaling, drug resistance, and tumor progression mechanisms. Its epithelial origin and EGFR dependency make it particularly relevant for examining cross-talk between EGFR and ephrin pathways, which frequently co-regulate tumor malignancy.
EFNB1 encodes ephrin-B1, a transmembrane ligand for Eph receptor tyrosine kinases. Ephrin-B1 mediates forward signaling through EphB receptors (EphB1, EphB2, EphB3) and EphA4, activating downstream cascades such as Ras/MAPK and Rho GTPases, including RhoA, Rac1, and cdc42, which regulate cytoskeletal dynamics. Reverse signaling via ephrin-B1??s intracellular domain recruits adaptor proteins Grb4 and PDZ domain-containing proteins, influencing adhesion and migration. Additionally, ephrin-B1 signaling intersects with the PI3K/AKT pathway, modulating cyclin D1 expression and cell cycle progression, and interacts with clathrin adaptors for endocytosis and signal modulation. Upstream regulators such as FGF and Wnt further integrate ephrin-B1 into broader developmental and oncogenic programs.
In the NCI-H1975 background, EFNB1 disruption is anticipated to perturb bidirectional Eph/ephrin communication, potentially altering EGFR-driven signaling dynamics. Given the role of ephrin-B1 in cell adhesion, boundary formation, and migration, knockout cells are expected to exhibit modified invasive and migratory behavior, key traits in metastasis. Co-operation between EGFR mutations and ephrin signaling may influence epithelial-mesenchymal transition (EMT) and drug sensitivity, making this model valuable for investigating resistance mechanisms to EGFR tyrosine kinase inhibitors and exploring novel combination therapies targeting Eph receptors.
This EFNB1 knockout polyclonal cell population is optimized for diverse experimental applications, including cancer cell migration and invasion assays (scratch wound and Boyden chamber), phospho-ERK and phospho-AKT signaling analyses, flow cytometric apoptosis assessment, immunofluorescence staining of adhesion markers, and RT-qPCR profiling of downstream targets such as cyclin D1 and Rho GTPases. It serves as a robust model for ephrin signaling studies, EMT research, and tumor microenvironment investigations. For further technical details or to discuss custom gene-edited cell products, please contact Ascent Research.
