The BLOC1S4 Knockout SK-HEP-1 Polyclonal Cells represent a CRISPR/Cas9-mediated gene-disrupted polyclonal population derived from the human SK-HEP-1 hepatocellular carcinoma line, engineered to eliminate BLOC1S4 expression. Serving as a versatile loss-of-function tool, this model facilitates investigation of lysosome-related organelle (LRO) biogenesis??particularly melanosomes and platelet dense granules??within a hepatic epithelial background, with polyclonal heterogeneity suitable for population-level phenotypic screening.
The SK-HEP-1 host cell line originates from a hepatic adenocarcinoma and displays both epithelial and endothelial-like properties, making it a standard model for liver cancer and cell motility studies. Its hepatic origin and vesicular trafficking competence make it particularly suitable for dissecting lysosomal and LRO pathways in a tumor-relevant background, where lysosomal dysfunction is linked to cancer progression.
BLOC1S4 is a core subunit of the BLOC-1 complex, which sorts cargo from early endosomes to LROs. It interacts with BLOC1S1, BLOC1S2, BLOC1S3, BLOC1S5, BLOC1S6, the AP-3 adaptor, and clathrin to deliver melanogenic enzymes like TYR and TYRP1 and lysosomal hydrolases to their destinations. Its expression is driven by MITF and TFEB transcription factors. CRISPR knockout disrupts this sorting, causing mislocalization of cargo and impaired melanosome maturation and platelet dense granule formation, recapitulating Hermansky-Pudlak syndrome type 7.
In the SK-HEP-1 background, BLOC1S4 knockout offers a unique platform to explore how defective LRO biogenesis intersects with hepatocellular carcinoma. Although not melanocytic, these cells express the endosomal transport machinery, allowing dissection of BLOC-1/AP-3 trafficking. Lysosomal dysregulation is implicated in hepatocarcinogenesis, affecting autophagy, invasion, and drug resistance; this model can reveal BLOC-1-dependent contributions to these processes. The endothelial-like properties of SK-HEP-1 also support studies on LRO-linked cell adhesion and migration.
This product is optimized for diverse functional assays, including Western blot for BLOC1S4 and cargo proteins, immunofluorescence for TYRP1 and LAMP1, and RT-qPCR for MITF/TFEB targets. Co-immunoprecipitation can assess BLOC-1 complex assembly, while pigmentation and platelet aggregation assays evaluate functional consequences. Researchers studying Hermansky-Pudlak syndrome, melanosome trafficking, platelet disorders, or lysosomal roles in liver cancer will benefit from this model. For details, contact Ascent Research.
