HRH1 Knockout TE1 Polyclonal Cells are a CRISPR/Cas9-mediated polyclonal knockout population derived from the TE1 human esophageal squamous cell carcinoma line. This loss-of-function model disrupts the HRH1 gene, encoding the histamine H1 receptor, to enable study of its contributions to cancer and inflammatory signaling. The polyclonal format ensures representation of diverse edited alleles while minimizing clonal artifacts.
The TE1 host cell line was established from a poorly differentiated human esophageal squamous cell carcinoma and is widely used as an epithelial model for drug response profiling, oncogene analysis, and studies of proliferation and migration. Its tumorigenic properties make it suitable for examining the role of histamine signaling in the esophageal tumor microenvironment.
HRH1 is a Gq/11-coupled receptor that, upon histamine binding, activates phospholipase C-?? to produce IP3 and DAG. IP3 mobilizes intracellular calcium, while DAG activates protein kinase C. These events stimulate downstream effectors including NF-??B and ERK1/2 MAP kinase pathways. Receptor regulation involves ??-arrestin, GRKs, and Homer scaffolding proteins. Transcription factors AP-1 and CREB mediate expression of targets like IL-8 and COX-2. Inflammatory cytokines (IL-4, IL-13) and GATA factors modulate HRH1 expression.
In esophageal squamous cell carcinoma, HRH1 activation by mast cell-derived histamine may promote tumorigenesis via NF-??B and ERK1/2 signaling, enhancing survival, proliferation, and possibly metastasis. The knockout cells allow researchers to isolate HRH1-specific effects from other histamine receptor subtypes and GPCR pathways, facilitating studies of epithelial-mesenchymal transition, angiogenesis, and immune evasion.
Practical applications include calcium flux assays, NF-??B/AP-1 luciferase reporter systems, phospho-ERK western blotting, and MTT/XTT proliferation assays. Migration can be assessed by transwell or wound healing. RNA-sequencing and RT-qPCR enable global and targeted expression profiling. Co-culture with immune cells models histamine-mediated tumor-immune crosstalk. For additional information, contact Ascent Research.
