The DNAJC5 Knockout SK-HEP-1 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population in the SK-HEP-1 hepatic adenocarcinoma line, established through CRISPR/Cas9-mediated disruption of the DNAJC5 gene. This model provides a loss-of-function system for investigating the cellular roles of DNAJC5-encoded cysteine string protein ?? (CSP??) in the context of liver adenocarcinoma.
The SK-HEP-1 parental cell line was originally isolated from the ascitic fluid of a patient with liver adenocarcinoma and displays an epithelial morphology. SK-HEP-1 cells are negative for alpha-fetoprotein, differentiating them from hepatocellular carcinoma lines, and are widely employed as a model for hepatic adenocarcinoma to study tumor cell biology, including proliferation, migration, and drug sensitivity.
DNAJC5 encodes CSP??, a synaptic vesicle-associated co-chaperone that is critical for exocytosis and protein homeostasis. CSP?? stimulates the ATPase activity of HSC70 (HSPA8), facilitating the folding and assembly of SNARE complex components such as SNAP-25, Syntaxin-1A, and VAMP2. This chaperone cycle is essential for SNARE-mediated membrane fusion during neurotransmitter release and other secretory processes. Expression of DNAJC5 is regulated by upstream factors including heat shock factor 1 (HSF1) and is responsive to cellular stress stimuli and calcium influx. CSP?? also interacts with G protein subunits, linking it to diverse signaling pathways. Within the cellular network, DNAJC5 participates in chaperone-mediated autophagy and the unfolded protein response, highlighting its role in proteostasis.
In the hepatic adenocarcinoma context, knockout of DNAJC5 disrupts CSP??-dependent protein quality control and secretion, potentially altering the release of exosomes, cytokines, and matrix remodeling factors. Given the role of SNARE proteins in cancer cell secretion, loss of CSP?? may impair membrane trafficking and increase susceptibility to proteotoxic stress, offering insights into how cancer cells manage protein aggregation. This model connects the biology of neurodegeneration-associated proteins, such as CSP??, to liver cancer, where autophagy and stress responses are key determinants of tumor progression.
Researchers can utilize this polyclonal knockout product for Western blot analysis of SNARE proteins, co-immunoprecipitation of HSC70 complexes, and immunofluorescence localization of CSP??. Functional assays include exosome secretion measurements and cell viability tests under stress conditions. The model supports drug screening for compounds that modulate chaperone activity or SNARE complex function, particularly in the context of adult-onset neuronal ceroid lipofuscinosis (ANCL) and other neurodegenerative disorders. Additionally, it enables investigation of cross-talk between secretory pathways and autophagy in liver adenocarcinoma. For further technical information or custom cell engineering services, please contact Ascent Research.
