The HS3ST1 Knockout LoVo Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population targeting the human HS3ST1 gene in the LoVo colorectal adenocarcinoma cell line. This product is supplied as a polyclonal pool, reflecting the complexity of the CRISPR/Cas9 editing process without clonal isolation. This loss-of-function model disrupts the expression of HS3ST1, which encodes heparan sulfate glucosamine 3-O-sulfotransferase 1, providing a physiologically relevant system for investigating sulfation-dependent interactions in cancer biology and viral pathogenesis. The polyclonal format ensures a heterogeneous knockout population derived from bulk gene editing, eliminating the need for single-cell cloning and maintaining genetic diversity.
The host cell line, LoVo, was established from the metastatic left supraclavicular lymph node of a 56-year-old male with colon adenocarcinoma. LoVo cells are characterized by high microsatellite instability (MSI-H), MLH1 deficiency, and the presence of the BRAF V600E mutation, alongside wild-type KRAS. These features render LoVo cells a widely used model for studying colorectal cancer metastasis, particularly in the context of aberrant signaling pathways and therapeutic resistance mechanisms.
HS3ST1 catalyzes the transfer of sulfate groups from the co-substrate 3??-phosphoadenosine 5??-phosphosulfate (PAPS) to glucosamine residues within heparan sulfate chains, generating specific 3-O-sulfated motifs. These motifs serve as critical binding sites for antithrombin, enhancing its anticoagulant activity, and for growth factors such as FGF2 and VEGF, thereby modulating downstream signaling through their respective receptors FGFR and VEGFR. Additionally, 3-O-sulfated heparan sulfate acts as a receptor for herpes simplex virus glycoprotein D, facilitating viral entry. Thus, HS3ST1 sits at a nexus of coagulation, growth factor signaling, and viral infection pathways.
In the context of LoVo colorectal cancer cells, HS3ST1-mediated sulfation may influence tumor progression by modulating FGF2-dependent proliferation and VEGF-driven angiogenesis. Knockout of HS3ST1 in this polyclonal population likely disrupts heparan sulfate structural integrity, impairing the presentation of growth factors and antithrombin binding. This model is particularly valuable for dissecting the role of heparan sulfate fine structure in metastatic behavior, altered cell adhesion, and response to viral challenge, without confounding effects from clonal selection.
Researchers can employ this knockout model in diverse functional studies, including heparan sulfate structure-function analysis, antithrombin binding assays, FGF2 signaling readouts such as phospho-ERK western blotting, and viral attachment assays to interrogate HSV-1 entry mechanisms. Additional applications encompass migration assays, RNA-seq transcriptomic profiling, and drug target validation in the colorectal cancer background. The polyclonal nature supports scalable experimental designs. Together, these applications enable comprehensive dissection of HS3ST1 function in physiologically relevant colorectal cancer models. For ordering and technical inquiries, please contact Ascent Research.
