The BAG5 Knockout CAL-27 Polyclonal Cells product comprises a CRISPR/Cas9-edited polyclonal knockout cell population derived from the CAL-27 human tongue squamous cell carcinoma cell line, with targeted disruption of the BAG5 gene. This heterogeneous pool of gene-edited cells avoids clonal selection, providing a representative loss-of-function model for investigating BAG5 biology in an oral mucosal epithelial context.
CAL-27 is an adherent epithelial cell line originated from a human oral squamous cell carcinoma of the tongue, frequently employed as a preclinical model for oral cancer. It retains characteristics of the oral mucosal epithelium and is particularly suited for studying molecular mechanisms underlying tumorigenesis, metastasis, and therapeutic resistance, including those involving protein homeostasis and stress signaling.
BAG5 functions as a nucleotide exchange factor and co-chaperone that negatively regulates the Hsp70/Hsc70 chaperone machinery, thereby influencing protein folding, aggregate clearance, and cell survival. BAG5 acts downstream of heat shock factor 1 (HSF1) and cellular stress, and interacts with key partners including Hsp70/Hsc70, Parkin, DJ-1, Hsp90, and the anti-apoptotic protein Bcl-2. Through these interactions, BAG5 modulates apoptotic thresholds by stabilizing Bcl-2 and inhibiting Bax-mediated mitochondrial permeabilization. It also participates in autophagy regulation, evidenced by its impact on LC3 lipidation and p62/SQSTM1 turnover, and contributes to aggresome formation. Disruption of BAG5 leads to dysregulated Hsp70/Hsc70 activity, elevated proteotoxic stress, altered MAP kinase signaling (ERK, JNK, p38), and a pro-apoptotic phenotype, highlighting its integrative role in cellular stress responses.
In the CAL-27 oral squamous carcinoma cell background, BAG5 knockout is predicted to compromise the buffering capacity against proteotoxic stress, thereby sensitizing cells to apoptosis. The loss of BAG5-mediated co-chaperone function disrupts Hsp70/Hsc70 regulation, leading to accumulation of misfolded proteins and potential activation of the unfolded protein response. Concurrent attenuation of Bcl-2-dependent anti-apoptotic protection and altered autophagic flux are expected to diminish tumor cell resilience. This model thus provides a physiologically relevant platform to dissect the contributions of BAG5 to oral cancer cell survival and to evaluate its role in chemoresistance mechanisms.
Researchers can employ this polyclonal knockout cell population for a range of applications, including mechanistic studies of chaperone-assisted protein folding, apoptosis signaling, autophagy, and aggresome dynamics. Representative assays include Western blotting and RT-qPCR for analyzing BAG5, Hsp70, Bcl-2, Bax, LC3, and p62; co-immunoprecipitation for chaperone complexes; annexin V flow cytometry; MTT viability assays; immunofluorescence for aggresome visualization; and migration/invasion and drug sensitivity testing. The polyclonal format offers population-level resolution, making it suitable for bulk biochemical analyses and screening campaigns. For further technical inquiries, please contact Ascent Research.
