The BAG3 Knockout CAL-27 Polyclonal Cells consist of a CRISPR/Cas9-edited polyclonal knockout cell population generated from the human tongue squamous cell carcinoma cell line CAL-27. This heterogeneous pool contains BAG3 gene disruptions, providing a versatile loss-of-function model for studying BAG3-dependent processes. Unlike monoclonal isolates, the polyclonal format preserves genetic diversity and better mimics tumor heterogeneity, making it ideal for unbiased functional genomics and pharmacological studies in cancer research.
CAL-27 is an extensively characterized epithelial tumor line derived from a tongue squamous cell carcinoma. It retains aggressive features including dysregulated adhesion, invasive potential, and aberrant pro-survival signaling. Widely utilized in head and neck cancer research, CAL-27 serves as a clinically relevant host for investigating molecular mechanisms of tumor progression, metastasis, and drug resistance, and for evaluating the role of BAG3 in oral cancer biology.
BAG3 functions as a stress-inducible co-chaperone that coordinates selective autophagy and apoptosis inhibition. It is transcriptionally activated by HSF1 and NF-??B in response to proteotoxic stress, heat shock, or proteasome inhibition. Mechanistically, BAG3 bridges HSPA8/Hsc70-bound cargo to autophagic receptors SQSTM1/p62 and LC3, facilitating degradation of misfolded proteins. Concurrently, BAG3 binds Bcl-2 family proteins to suppress apoptosis, thereby promoting cell survival. BAG3 also modulates MAPK and NF-??B signaling and interacts with HspB8, synaptopodin-2, and cytoskeletal components, placing it at the intersection of stress adaptation and oncogenic pathways.
In oral squamous cell carcinoma, BAG3 overexpression contributes to chemoresistance and tumor maintenance by sustaining autophagy and blocking apoptosis. Disrupting BAG3 in CAL-27 cells using this polyclonal knockout population allows researchers to dissect the autophagy-apoptosis crosstalk and assess the dependency of tongue carcinoma cells on BAG3 for survival under therapeutic challenge. This model is particularly suited for investigating how BAG3 integrates mitogenic and stress signals through NF-??B and MAPK to drive malignant phenotypes.
Typical research applications include autophagy flux assays monitoring LC3 turnover, apoptosis assays using Annexin V, and western blotting for effectors such as LC3-II, cleaved caspase-3, and phosphorylated MAPKs. Co-immunoprecipitation can be employed to validate BAG3 interactions with HSPA8, SQSTM1/p62, and Bcl-2. Cell viability and migration assays in the presence of chemotherapeutic agents enable drug sensitivity profiling. For questions or further details, contact Ascent Research.
