The ARL8B Knockout HeLa Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population derived from HeLa cells, providing a heterogeneous loss-of-function model. This non-clonal population captures diverse editing outcomes without single-cell cloning, enabling robust studies of ARL8B-dependent processes.
HeLa cells are an immortalized human cervical adenocarcinoma line (HPV18 positive) widely used for their robust growth, ease of manipulation, and well-characterized signaling pathways. As a cancer-derived epithelial model, HeLa endogenously expresses endolysosomal and mTOR pathway components, making them suitable for dissecting ARL8B-mediated lysosomal functions.
ARL8B is a small Arf-like GTPase that localizes to lysosomes and acts as a central regulator of lysosomal motility and positioning. Activated by the BORC complex (BLOS1, BLOS2, KXD1, SNAPIN), ARL8B recruits SKIP (PLEKHM2) to the lysosomal surface, linking lysosomes to kinesin-1 (KIF5B) motors for anterograde transport toward the periphery. Thus, ARL8B controls lysosomal exocytosis, mTORC1 signaling, and autophagic flux through spatial regulation. It also interacts with HOPS complex components (VPS39, VPS41) for lysosomal fusion. Upstream, lysosomal stress and mTORC1 feed back to modulate BORC-ARL8B, positioning ARL8B as a key node in endolysosomal trafficking.
In HeLa cells, ARL8B disruption likely impairs anterograde lysosome transport, causing perinuclear clustering and altered lysosomal functions. This model is relevant for cancer cell migration/invasion, as lysosomal positioning influences focal adhesion turnover and matrix degradation. HeLa cells are also a key system for mTORC1 signaling, which depends on lysosomal surface residency; thus, ARL8B knockout provides insights into nutrient sensing and autophagy regulation.
Researchers can employ this model in assays such as western blotting for protein loss, immunofluorescence microscopy for lysosome positioning, Lysotracker staining, co-immunoprecipitation of ARL8B-SKIP, kinesin motor assays, and cell migration/invasion tests. Downstream signaling readouts include mTORC1 activity (phospho-S6K) and autophagy flux (LC3-II turnover). Transcriptome analysis via RNA-seq can reveal ARL8B-dependent networks. For further information, contact Ascent Research.
