The HS3ST1 Knockout T-47D Polyclonal Cells constitute a CRISPR/Cas9-edited polyclonal knockout population generated through targeted disruption of the HS3ST1 gene in the human T-47D breast cancer cell line. This polyclonal knockout pool provides a heterogeneous loss-of-function model that enables comprehensive interrogation of HS3ST1-dependent processes without clonal restriction.
The parental T-47D cell line is a well-established human breast ductal carcinoma model originally isolated from the metastatic pleural effusion of a 54-year-old female patient with infiltrating ductal carcinoma. T-47D cells represent the luminal A molecular subtype of breast cancer, characterized by expression of estrogen and progesterone receptors and hormone-responsive growth, making them a key system for studying hormone-dependent tumor biology and endocrine therapy resistance.
HS3ST1 encodes heparan sulfate 3-O-sulfotransferase 1, a Golgi-resident enzyme that catalyzes the transfer of sulfate from 3′-phosphoadenosine-5′-phosphosulfate (PAPS) to the 3-OH position of glucosamine residues within heparan sulfate chains. This modification generates specific sulfation motifs critical for binding antithrombin III, thereby potentiating anticoagulant activity. Beyond coagulation, HS3ST1-mediated 3-O-sulfation modulates interactions between heparan sulfate proteoglycans and various protein ligands, including FGF2 and its receptor FGFR1, components of the Wnt pathway, and the HSV-1 glycoprotein D, thereby influencing growth factor signaling, morphogen gradients, and viral entry. The biosynthetic network involves coordinated action with EXT1, EXT2, NDST1, and PAPS synthetases (PAPSS1, PAPSS2). Upstream, HS3ST1 expression is regulated by FGF2, estradiol, and inflammatory stimuli, placing it at the intersection of hormonal and microenvironmental signals.
In the context of T-47D luminal A breast cancer cells, disruption of HS3ST1 allows direct assessment of how 3-O-sulfated heparan sulfate structures contribute to hormone-dependent tumor phenotypes. Altered HS3ST1 activity may affect FGF2-driven proliferation and ERK phosphorylation, Wnt pathway activation, and cellular responses to estradiol, all of which are relevant to breast cancer progression and angiogenesis. This knockout polyclonal population thus provides a versatile platform for dissecting the roles of heparan sulfate fine structure in cancer cell signaling, coagulation-related tumor biology, and viral susceptibility within a clinically relevant breast cancer subtype.
Researchers can employ these polyclonal knockout cells in a range of experimental workflows, including heparan sulfate disaccharide analysis by mass spectrometry to quantify 3-O-sulfation levels, antithrombin III binding assays to evaluate anticoagulant potential, FGF2-induced phospho-ERK assays to probe growth factor signaling, and WST-1 or Transwell migration assays to evaluate proliferation and motility. Additional applications encompass flow cytometric analysis of heparan sulfate epitopes, RT-qPCR and Western blotting for pathway component expression, and drug screening for sulfotransferase modulators. For further information, please contact Ascent Research.
