The HSPBP1 Knockout SK-HEP-1 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal cell population for targeted disruption of HSPBP1 in a human liver adenocarcinoma model. This loss-of-function tool enables investigation of HSPBP1 co-chaperone function in protein quality control. As a heterogeneous polyclonal knockout, it avoids clonal artifacts while providing robust functional interrogation. The cells are derived from the SK-HEP-1 hepatocellular carcinoma line, an adherent epithelial model widely used in cancer research. This product is provided ready-to-use for advanced studies in chaperone biology and stress signaling.
SK-HEP-1, originally isolated from a liver adenocarcinoma, is a tumorigenic human cell line with adherent epithelial morphology. It retains key signaling pathways relevant to hepatocellular carcinoma pathogenesis, including those governing apoptosis, proliferation, and stress responses. The cell line is permissive to genetic manipulation, making it suitable for generating knockout models that mirror the genetic vulnerabilities of hepatic tumors. Its use as a host enables contextual study of gene function in a clinically pertinent cancer background.
HSPBP1 acts as a co-chaperone that binds Hsp70 and inhibits its ATPase activity, thereby shifting the balance from protein refolding toward ubiquitin-dependent degradation. Its expression is transcriptionally regulated by HSF1 in response to heat shock, oxidative stress, and ER perturbations. HSPBP1 interacts with Hsp70, the CHIP ubiquitin ligase, and Hsp40 co-chaperones, and modulates stress granule dynamics by affecting TIA-1 and G3BP1 recruitment. Knockout relieves Hsp70 inhibition, disrupting stress granule homeostasis and sensitizing cells to proteotoxic insults, while also altering apoptosis signaling downstream of Hsp70 client handling.
In hepatocellular carcinoma, HSPBP1 knockout in SK-HEP-1 cells provides a platform to examine how chaperone network alterations influence tumor cell stress adaptation, drug sensitivity, and apoptotic thresholds. Liver cancer cells often exhibit heightened reliance on Hsp70 systems for survival under proteotoxic load; HSPBP1 deficiency may expose synthetic vulnerabilities exploitable by Hsp70 inhibitors or proteasome blockers. Additionally, disrupted stress granule formation can be directly studied, linking chaperone regulation to RNA granule dynamics in cancer. This model thus facilitates dissection of molecular mechanisms underlying hepatic tumor cell fitness.
Research applications include analyzing chaperone-mediated protein quality control, mapping stress granule regulatory pathways, and screening Hsp70 modulators. Typical assays performed with these polyclonal knockout cells include Western blot and RT-qPCR for target validation, immunofluorescence-based stress granule visualization, Annexin V apoptosis assays, cell viability under proteotoxic stress, co-immunoprecipitation of Hsp70 complexes, proteasome activity measurements, and drug sensitivity testing with Hsp70 inhibitors. For further details or technical assistance, please contact Ascent Research.
