The KRT19 Knockout CAL-27 Polyclonal Cells are a CRISPR/Cas9-mediated polyclonal knockout population derived from the human tongue squamous cell carcinoma cell line CAL-27, featuring targeted disruption of the KRT19 gene. This heterogeneous pool of knockout cells retains the parental line’s background while introducing loss-of-function mutations in the keratin 19 locus across the population. The polyclonal format provides a representative gene-edited model that avoids clonal selection artifacts and is suitable for studying KRT19-dependent processes in oral cancer biology. The cells are supplied as a mixed population of edited and potentially unedited clones, reflecting the complexity of CRISPR/Cas9-mediated gene disruption in a cancer cell context.
CAL-27 is a well-characterized adherent epithelial cell line isolated from a human tongue squamous cell carcinoma and harbors a TP53 mutation, which is common in aggressive oral cancers. This cell line serves as a widely used in vitro model for oral squamous cell carcinoma research, exhibiting properties relevant to tumor progression, including invasive capacity and molecular features of epithelial malignancy. The TP53-mutant background renders CAL-27 particularly useful for investigating pathways that intersect with p53 signaling and contributes to the study of genomic instability, apoptosis resistance, and therapeutic responses in head and neck cancers.
KRT19 encodes keratin 19, a type I intermediate filament protein essential for epithelial cell structural integrity and cytoskeletal organization. KRT19 is a canonical epithelial marker and its expression is regulated by transcription factors such as p63, AP-1, STAT3, and the Wnt/??-catenin pathway through TCF/LEF complexes, as well as Notch intracellular domain signaling. Disruption of KRT19 in CAL-27 cells alters keratin filament assembly, as KRT19 normally forms heterodimers with its type II partner KRT8 and interacts with cytoskeletal adaptors including plectin and desmoplakin. Loss of KRT19 can modulate downstream targets such as CDH1 (E-cadherin), VIM (vimentin), CTNNB1 (??-catenin), and ITGB1, thereby influencing cell adhesion, migration, and the balance between epithelial and mesenchymal phenotypes. The knockout model may also impact YAP/TAZ mechanosignaling and alter cellular responses to extracellular matrix cues.
In the context of CAL-27 tongue carcinoma cells, KRT19 knockout provides a powerful system to dissect the molecular mechanisms driving epithelial-mesenchymal transition (EMT) and metastatic behavior. The disruption of keratin networks is predicted to reduce mechanical resilience and could attenuate invasive potential, making these cells valuable for assessing the role of intermediate filaments in oral tumor progression. Coupled with the TP53-mutant background, this model enables the study of crosstalk between cytoskeletal integrity and tumor suppressor pathways. Researchers can use these polyclonal cells to evaluate how KRT19 loss influences signaling through PI3K/Akt, Wnt/??-catenin, and Notch cascades, contributing to a deeper understanding of oral squamous cell carcinoma biology.
Typical research applications include oral cancer progression studies, cell migration and invasion assays using Boyden chamber or Matrigel setups, and EMT research through analysis of marker expression by Western blot, RT-qPCR, or flow cytometry. The cells are also suitable for drug resistance investigations, biomarker validation, and assessment of cancer cell mechanical properties via atomic force microscopy (AFM). RNA-seq experiments can reveal transcriptome-wide changes upon KRT19 disruption, while immunofluorescence allows visualization of altered keratin networks and focal adhesions. These applications make the KRT19 Knockout CAL-27 Polyclonal Cells a versatile tool for oncology and cell biology laboratories. For further technical information, please contact Ascent Research.
