The EHBP1 Knockout NCI-H1975 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population engineered for loss-of-function studies of the EHBP1 gene in a human lung adenocarcinoma background. This polyclonal knockout model, generated by CRISPR/Cas9-mediated targeting of EHBP1, provides a heterogeneous population carrying a range of genetic disruptions in the EHBP1 locus, suitable for studying the gene’s functional requirements in endocytic trafficking and actin dynamics. The host cell line, NCI-H1975, is widely employed in non-small cell lung cancer research, particularly in the context of EGFR mutation-driven oncogenesis and therapeutic resistance.
Derived from a human lung adenocarcinoma, NCI-H1975 cells harbor activating EGFR mutations (L858R and T790M) and a TP53 mutation, rendering them a key model for EGFR tyrosine kinase inhibitor (TKI) resistance studies. These adherent epithelial cells retain morphological and signaling features of lung adenocarcinoma, making them a physiologically relevant platform for investigating tumor cell biology, including migration, invasion, and drug sensitivity.
EHBP1 encodes an adaptor protein that integrates endocytic recycling with actin cytoskeleton remodeling. It functions as a scaffold, linking EH domain-containing proteins such as EPS15 to N-WASP and the Arp2/3 complex, thereby promoting localized actin polymerization at endocytic sites. Through its BAR domain, EHBP1 senses and generates membrane curvature, facilitating clathrin-mediated endocytosis and subsequent vesicle trafficking. EHBP1 is regulated upstream by EGFR signaling and Rho GTPases including CDC42 and Rac1, and its downstream effectors control integrin trafficking and cell migration. Representative components of the EHBP1-associated pathway include EPS15, EHBP1, N-WASP, ARP2/3, actin, clathrin, and dynamin, collectively coordinating endosomal recycling and actin-driven membrane dynamics.
In the NCI-H1975 context, EHBP1 disruption is particularly significant given the cell line’s dependency on EGFR signaling. EHBP1 participates in EGFR recycling, a process that modulates receptor availability and downstream signaling output. Loss of EHBP1 function may alter EGFR trafficking, potentially impacting sensitivity to EGFR TKIs such as osimertinib. Additionally, EHBP1??s role in actin remodeling links its function to the migratory and invasive properties of lung adenocarcinoma cells. Thus, this knockout model offers a valuable tool for dissecting the interplay between endocytic trafficking, actin dynamics, and oncogenic signaling in a defined NSCLC genetic background.
Researchers can employ these EHBP1 knockout polyclonal cells in a broad array of experimental assays to investigate EGFR signaling dynamics, endocytosis, and cell motility. Typical applications include Western blot analysis of EGFR, AKT, and ERK phosphorylation, immunofluorescence imaging of EGFR localization and F-actin distribution, and endocytosis/recycling assays using transferrin uptake. Functional studies such as transwell migration and wound healing assays can assess the contribution of EHBP1 to cell invasion. Co-immunoprecipitation experiments with EPS15 or N-WASP can validate disrupted protein interactions, while drug sensitivity assays with osimertinib can explore the role of EHBP1 in TKI resistance. For further information and availability, please contact Ascent Research.
