The IKBKB Knockout CAL-27 Polyclonal Cells are a heterogeneous population of CAL-27 oral squamous cell carcinoma cells subjected to CRISPR/Cas9-mediated disruption of the IKBKB gene. This polyclonal knockout pool is not a clonal isolate and provides a genetically diverse loss-of-function model suitable for population-level analyses of IKK??-dependent pathways.
CAL-27 is an adherent epithelial cell line derived from a tongue squamous cell carcinoma of a 56-year-old male patient. It serves as a well-characterized model for studying oral cancer biology, including tumorigenesis, metastasis, and drug response.
IKBKB encodes IKK??, the catalytic subunit of the I??B kinase (IKK) complex, which also includes IKK?? (CHUK) and the regulatory scaffold NEMO (IKK??). Upon activation by upstream signals such as TNF??, IL-1??, LPS, TCR/BCR ligation, and RANKL, IKK?? phosphorylates I??B?? and I??B??, triggering their ubiquitination and proteasomal degradation. This liberates NF-??B dimers (p65/p50) to translocate to the nucleus and drive transcription of genes regulating inflammation (IL-6, IL-8, TNF??), survival (Bcl-xL, Bcl-2, cIAP1/2, XIAP), proliferation (Cyclin D1, c-Myc), and invasion (MMPs). Key adaptors include TRAF2/6, TAK1, TAB1/2, RIP1, and NOD2, while A20 and CYLD serve as negative regulators.
In CAL-27 cells, constitutive or stimulus-induced NF-??B activity promotes oncogenic traits. Knockout of IKBKB disrupts canonical NF-??B signaling, impairing expression of downstream targets and enhancing susceptibility to apoptosis while dampening inflammatory cytokine output. This model therefore enables dissection of IKK?¡?s role in oral squamous cell carcinoma pathogenesis and the evaluation of therapeutic strategies aimed at NF-??B inhibition.
Researchers can utilize this polyclonal knockout population in a variety of assays, including Western blotting for IKBKB and phospho-I??B??, NF-??B luciferase reporter assays, RT-qPCR of target genes, and ELISA for cytokine secretion. Functional readouts such as MTT or clonogenic survival, annexin V apoptosis detection, and migration/invasion assays are directly applicable. The cells also facilitate co-immunoprecipitation studies of IKK complex assembly, RNA-seq transcriptome profiling, and drug sensitivity testing with IKK?? inhibitors. These applications support studies of chemoresistance, inflammatory signaling, and functional genomics in head and neck cancer. For further information or to discuss customized applications, please contact Ascent Research.
