The HSF1 Knockout SK-HEP-1 Polyclonal Cells are a genetically modified derivative of the human SK-HEP-1 cell line, generated via CRISPR/Cas9-mediated disruption of the HSF1 gene. This product is delivered as a polyclonal knockout cell population, representing a heterogeneous pool of cells harboring targeted gene disruptions. The resulting loss-of-function model enables investigation of HSF1-dependent processes without the artifacts of acute chemical inhibition or RNAi.
The parental SK-HEP-1 cell line is an adherent epithelial line derived from the ascitic fluid of a patient with adenocarcinoma of the liver. It is widely employed as a model for hepatocellular carcinoma and other hepatic malignancies, facilitating studies of tumor biology, drug sensitivity, and metastasis. This line??s human origin and tumorigenic properties make it a relevant platform for examining the role of stress-responsive transcription factors in liver cancer.
HSF1 encodes the master transcriptional regulator of the heat shock response (HSR), orchestrating expression of molecular chaperones in response to stress. Inactive HSF1 monomers are sequestered by HSP90 and HSP70; stress-induced release triggers trimerization, phosphorylation by mTOR, AMPK, and p38 MAPK, and nuclear translocation to activate genes via heat shock elements. Key targets include HSPA1A, HSP90AA1, HSPB1, and BAG3, which promote proteostasis and survival. HSF1 also upregulates FOXM1 and CCND1, linking HSR to cell cycle control, and interacts with HSF2/HSF4 and regulatory proteins DAXX and PIN1.
Disruption of HSF1 in the SK-HEP-1 liver adenocarcinoma background generates a model with compromised heat shock response, leading to heightened proteotoxic stress under adverse conditions. Since HSF1 is frequently co-opted in cancer to buffer oncogenic stress, its loss in this hepatic line is expected to reduce tumorigenic fitness and sensitize cells to chemotherapeutic agents. This polyclonal knockout population enables dissection of HSF1 contributions to hepatocellular carcinoma progression, metastasis, and drug resistance within a liver-specific context.
This HSF1 knockout polyclonal pool is suited for diverse experimental workflows, including RT-qPCR and western blotting of HSP70 and HSP90 to assess HSR impairment, ChIP-qPCR for residual HSF1 binding, and immunofluorescence to monitor chaperone localization. Cell viability (MTT, XTT) and apoptosis (Annexin V) assays can quantify stress sensitivity, while Transwell assays evaluate migration/invasion changes. The model facilitates drug sensitivity screens to identify HSF1-dependent vulnerabilities and can be applied to autophagy and senescence studies. For further information, please contact Ascent Research.
