The HSP90AB1 Knockout Ca Ski Polyclonal Cells represent a versatile CRISPR/Cas9-edited polyclonal knockout population derived from the Ca Ski human cervical carcinoma cell line. This product enables loss-of-function studies of the HSP90AB1 gene, which encodes the HSP90?? molecular chaperone, without requiring isolation of a monoclonal line. The heterogeneous knockout population is designed to facilitate investigation of HSP90??-dependent signaling networks within a biologically relevant HPV-16-positive cervical cancer background, supporting both pooled and single-cell-derived analyses tailored to experimental variability in gene disruption efficiency.
The parental Ca Ski cell line was originally established from a cervical squamous cell carcinoma and is widely used as a model for HPV-driven cervical carcinogenesis. These cells express HPV-16 E6 and E7 oncoproteins, which are critical for maintaining the transformed phenotype, and they retain functional p53 and retinoblastoma protein inactivation mediated by viral factors. The cervical cancer origin makes Ca Ski cells particularly suitable for exploring HSP90??-mediated stabilization of oncogenic signaling components within an epithelial tumor microenvironment characterized by persistent HPV gene expression.
HSP90AB1 encodes the constitutively active isoform HSP90??, a central molecular chaperone that facilitates the folding, stability, and activation of numerous client proteins involved in signal transduction, cell cycle progression, and apoptosis. Key clients include kinases such as AKT, RAF1, and CDK4, as well as transcription factors like HIF1A and steroid hormone receptors. HSP90?? functions in concert with co-chaperones??including CDC37, STIP1 (HOP), AHA1, PTGES3 (p23), FKBP4, and PPP5C??to regulate client maturation. Upstream signals such as heat shock, growth factors (EGF, IGF), and oxidative stress modulate chaperone activity, while small-molecule inhibitors exemplified by geldanamycin competitively block ATP binding and disrupt client protein interactions. In the Ca Ski context, HSP90??-mediated stabilization of EGFR and downstream PI3K/AKT and MAPK/ERK cascades sustains proliferative and anti-apoptotic signaling.
Disrupting HSP90AB1 expression in Ca Ski cells abrogates the chaperoning capacity of HSP90??, leading to destabilization and proteasomal degradation of critical oncogenic client proteins. This loss of function is expected to impair HPV-driven transformation by reducing the half-life of viral and host factors that depend on HSP90?? for proper folding. Consequently, the knockout model provides a platform for dissecting HSP90??-dependent maintenance of the malignant phenotype in cervical cancer, including effects on cell cycle regulators, apoptosis thresholds, and the proteotoxic stress response. The polyclonal nature of the knockout population minimizes clonal artifacts and enables studies requiring multiple independent knockout variants.
Researchers can employ these HSP90AB1 knockout Ca Ski cells to investigate chaperone-mediated stabilization of HPV oncoproteins, screen for mechanisms of resistance to HSP90 inhibitors such as geldanamycin derivatives, or evaluate proteotoxic stress responses triggered by client protein misfolding. The model is compatible with a range of assays, including Western blotting for client proteins (e.g., AKT, RAF-1), RT-qPCR for downstream transcriptional targets, MTS-based cell viability assessments, Annexin V apoptosis assays, co-immunoprecipitation of HSP90?? with CDC37, and confocal microscopy to monitor client protein subcellular localization. For additional technical specifications or customized cell products, please contact Ascent Research.
