The EEA1 Knockout NCI-H1975 Polyclonal Cells product provides a CRISPR/Cas9-edited polyclonal knockout cell population designed to disrupt the EEA1 gene in the NCI-H1975 human lung adenocarcinoma epithelial cell line. This polyclonal knockout pool, generated by CRISPR/Cas9-mediated gene disruption, offers a physiologically relevant loss-of-function model for studying endosomal trafficking, autophagy, and EGFR signaling within a clinically significant non-small cell lung cancer background.
The NCI-H1975 cell line is derived from a female nonsmoker with non-small cell lung cancer and is widely used as an EGFR-mutant lung adenocarcinoma model. These cells harbor the activating L858R mutation in exon 21 and the T790M gatekeeper mutation in exon 20 of the EGFR gene, conferring resistance to first-generation tyrosine kinase inhibitors. NCI-H1975 cells display adherent epithelial morphology and are commonly employed to investigate mechanisms of EGFR signaling, endocytosis, and therapeutic resistance in lung cancer.
EEA1 functions as a Rab5 effector and tethering factor mediating early endosome fusion. Recruited to endosomes via PI3P binding generated by Vps34, it interacts with Rab5-GTP, Rabaptin-5, syntaxin-6, Vps45, and SNARE complexes to promote homotypic fusion. Acting downstream of Rab5 and PI3K/PI3P signaling, it regulates endosomal fusion, cargo sorting, receptor recycling, and lysosomal degradation. EEA1 also participates in autophagy initiation, influencing LC3 lipidation and autophagosome formation. Loss of EEA1 disrupts early endosome organization, impairing trafficking and potentially altering EGFR degradation and autophagy flux.
In the NCI-H1975 EGFR-mutant context, EEA1 ablation allows dissection of how endolysosomal trafficking impacts EGFR signaling and drug resistance. EGFR internalization, recycling, and degradation depend on functional early endosomes; EEA1 disruption enables study of impaired endosomal maturation on receptor turnover and downstream signaling. Autophagy, often upregulated in resistant NCI-H1975 cells, can be probed as EEA1-mediated endosome-autophagy crosstalk may modulate survival mechanisms under targeted therapy. This polyclonal knockout model thus supports investigation of autophagy-dependent resistance to EGFR inhibitors.
Researchers can employ the EEA1 knockout NCI-H1975 polyclonal cells in a variety of functional assays. Western blotting and immunofluorescence are routinely used to confirm EEA1 disruption and assess changes in endosomal markers (e.g., Rab5, LC3) or EGFR expression. Endocytosis and EGFR degradation assays utilizing labeled ligands (such as EGF) enable quantitative analysis of receptor trafficking kinetics. Autophagy flux can be evaluated by monitoring LC3-II turnover in the presence of lysosomal inhibitors, providing insight into the role of EEA1 in autophagosome maturation. These applications make this model valuable for drug discovery screens, functional genomics studies, and mechanistic investigations of endosome-driven signaling in lung cancer. For further technical details or inquiries regarding this product, please contact Ascent Research.
