The EEA1 Knockout CAL-27 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal population with targeted disruption of the EEA1 gene in CAL-27 cells. This loss-of-function model eliminates EEA1 expression, enabling detailed study of early endosome biology. The polyclonal format provides a heterozygous knockout mix, avoiding clonal artifacts and ensuring robust functional ablation. This cell population is optimized for investigations of endocytic trafficking and associated signaling in human tongue squamous cell carcinoma.
CAL-27 is a human tongue squamous cell carcinoma line derived from a poorly differentiated oral tumor. It retains key characteristics such as dysregulated growth factor signaling, invasive capacity, and altered endocytosis, making it a relevant model for head and neck cancer. The epithelial origin provides a context for studying how endosomal dynamics contribute to tumor progression and therapeutic response.
EEA1 encodes an early endosome tethering factor that mediates homotypic fusion. Its FYVE domain binds phosphatidylinositol 3-phosphate (PI3P), while it simultaneously interacts with GTP-bound Rab5, tethering vesicles for SNARE-mediated fusion. EEA1 acts downstream of Rab5 activation by growth factors like EGF and PI3K-derived PI3P, and collaborates with effectors such as Rabenosyn-5 and Syntaxin 13. It also interacts with calmodulin to regulate fusion. Through these interactions, EEA1 governs EGFR internalization, endosomal sorting, and lysosomal degradation, thereby controlling signal attenuation.
In CAL-27 oral carcinoma cells, EEA1 disruption impairs early endosome function, potentially altering EGFR trafficking and sustaining oncogenic signaling. Aberrant endocytosis is linked to cancer cell proliferation, migration, and invasion. EEA1 loss may delay endosome maturation, affecting cargo degradation and signal compartmentalization. This polyclonal knockout model provides a physiologically relevant system to probe endosomal dysregulation in oral cancer, avoiding clonal selection biases.
These cells are suitable for immunofluorescence co-staining of EEA1 and LAMP1 to assess endosome-lysosome defects, transferrin uptake assays, and EGFR degradation studies. Functional assays, including wound-healing migration and Matrigel invasion tests, can examine the role of early endosomes in motility. Confocal microscopy reveals endosomal morphology changes. The model also aids nanoparticle and antibody-drug conjugate uptake studies. For additional information, please contact Ascent Research.
