The BAG5 Knockout MCF-7 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout population originating from the MCF-7 breast adenocarcinoma line. This product features targeted disruption of the BAG5 gene, eliminating functional BAG5 protein. As a polyclonal pool, the cells harbor heterogeneous editing events, offering a robust loss-of-function model without clonal bias. The CRISPR/Cas9 system was used to introduce gene-inactivating mutations at the endogenous BAG5 locus, ensuring stable knockout. This cell population is an essential tool for studying BAG5-dependent cellular processes.
The MCF-7 host cell line was derived from the pleural effusion of a patient with metastatic breast carcinoma and displays adherent epithelial morphology. These cells are positive for estrogen and progesterone receptors and negative for HER2 amplification, representing a hormone-responsive luminal A subtype. MCF-7 is a cornerstone model for estrogen-dependent breast cancer research, offering a well-defined genetic and signaling background. Retention of this native context in the knockout cells permits analysis of BAG5 function within physiologically relevant breast cancer pathways.
BAG5 operates as a molecular co-chaperone that directly interacts with Hsp70/Hsc70, modulating client protein folding and trafficking. A key function of BAG5 is inhibition of parkin translocation to depolarized mitochondria, thereby suppressing PINK1/parkin-dependent mitophagy. Expression of BAG5 is induced by HSF1 and cellular stress conditions, including heat shock and oxidative stress. The protein also engages with DJ-1, BAG3, and the ubiquitin-proteasome system. By attenuating mitochondrial clearance, BAG5 contributes to the accumulation of damaged organelles and influences cellular proteostasis. Knockout of BAG5 therefore perturbs mitophagy and Hsp70 cycles, offering a direct approach to disentangle these interconnected systems.
In the MCF-7 breast cancer environment, BAG5 loss is predicted to enhance mitophagic flux and alter stress resilience. Breast cancer cells often exploit chaperone networks for survival, and BAG5 knockout can reveal vulnerabilities related to protein misfolding and mitochondrial dysfunction. Given the link between BAG5 and Parkinson??s disease, this model enables cross-pathway investigations into neurodegeneration and cancer biology. The ER-positive background adds value for studying hormone-influenced modulation of mitochondrial quality control and apoptosis.
These knockout cells support a range of assays, including western blotting for BAG5 and parkin, immunofluorescence staining of mitochondrial markers, and mitophagy monitoring with reporters such as mito-Keima. Apoptosis assays using annexin V and cell viability tests under oxidative or proteotoxic stress illuminate functional consequences. Co-immunoprecipitation of Hsp70 complexes can map altered chaperone interactomes. The model is well-suited for drug screening targeting chaperone or mitophagy pathways in cancer. For further technical support, please contact Ascent Research.
