The KRT8 Knockout CAL-27 Polyclonal Cells represent a CRISPR/Cas9-edited polyclonal knockout population derived from the CAL-27 cell line, designed for targeted disruption of the KRT8 gene. This product provides a genetically heterogeneous pool of cells carrying diverse gene-editing events at the KRT8 locus, serving as a loss-of-function model to investigate keratin 8-related biology. The polyclonal format avoids clonal selection artifacts and enables robust functional studies without the constraints of single-cell-derived sublines. As a ready-to-use knockout system, it eliminates the need for in-house genome engineering while maintaining the versatility required for high-content screening and mechanistic interrogation.
The parental CAL-27 line is a widely employed human epithelial model originating from a squamous cell carcinoma of the tongue. This adherent cell line retains characteristic features of oral squamous carcinomas, including rapid proliferation and anchorage-dependent growth, making it a suitable platform for studying head and neck cancer biology. CAL-27 cells endogenously express keratin 8 and its obligate partner keratin 18, contributing to an intermediate filament network that underpins the mechanical integrity of these malignant epithelial cells. The line??s well-documented provenance and molecular profile facilitate its use in diverse oncological investigations.
Keratin 8 is a type II intermediate filament protein that forms obligate heteropolymers with keratin 18 to orchestrate cytoskeletal architecture. This filament system is dynamically regulated by upstream cues including epidermal growth factor (EGF)/EGF receptor (EGFR) signaling, transforming growth factor-beta (TGF-??), and the transcription factors AP-1 and SP1. KRT8 interacts directly with KRT18, plectin, desmoplakin, 14-3-3 proteins, and the Fas death receptor, embedding it within a network that modulates cell adhesion, migration, and apoptosis. Downstream, KRT8 supports KRT18 filament assembly and influences cell adhesion molecules and apoptotic signaling molecules, while mechanistic studies indicate that KRT8 loss sensitizes cells to death receptor-mediated apoptosis through caspase modulation.
In CAL-27 cells, KRT8 disruption models the cytoskeletal vulnerabilities of squamous cell carcinomas, which often rely on intermediate filaments for invasive behavior and survival under mechanical stress. Loss of keratin 8 function impairs the structural resilience provided by the KRT8/KRT18 network, leading to altered migratory properties and enhanced sensitivity to apoptotic stimuli. This model recapitulates key aspects of carcinoma progression, including epithelial-to-mesenchymal transition-like changes and drug responsiveness, thereby offering a physiologically relevant system to dissect the molecular underpinnings of tumor cell adaptability in the tongue microenvironment.
Typical experimental applications include investigating intermediate filament-dependent regulation of cancer cell migration, epithelial-to-mesenchymal transition, and apoptosis resistance mechanisms using western blotting for KRT8 and KRT18, immunofluorescence for filament networks, migration/invasion assays, and Annexin V apoptosis assays. The model is particularly suited for drug sensitivity screening in the context of squamous cell carcinoma, enabling identification of compounds that exploit cytoskeletal vulnerabilities. For further details or to request this product, please contact Ascent Research.
