TNFαPro-Luc/EF1α-mCherry Reporter Cell Line - TE-1

The TNFαPro-Luc/EF1α-mCherry reporter cell line (based on TE-1) is a stably engineered derivative of the human esophageal squamous cell carcinoma cell line TE-1. It incorporates two reporter cassettes into its genome: the first places the TNFα promoter upstream of the firefly luciferase gene, allowing any stimulus that activates TNFα transcription to generate a quantifiable luminescent signal, which can be measured directly using a microplate reader. The second cassette utilizes the constitutively active EF1α promoter to drive the expression of the fluorescent protein mCherry, providing a stable red fluorescent signal that facilitates cell tracking under a microscope, as well as cell sorting and enrichment. This cell line was generated via lentiviral transduction followed by antibiotic selection to isolate stable clones; under standard culture conditions, the cells grow as an adherent monolayer. As the parental cell line is derived from esophageal cancer, this reporter system reflects promoter activity within a tumor-relevant context, rather than merely within an artificially immortalized setting.

This cell line is primarily used for research into the TNFα pathway and for compound screening. As a key pro-inflammatory cytokine, TNFα transcription is regulated by NF-κB and other transcription factors; consequently, this reporter system enables real-time, live-cell monitoring of upstream signaling events. Researchers can induce expression by stimulating the cells with cytokines, lipopolysaccharides (LPS), or TLR agonists, and track changes in luciferase activity in real time—an approach well-suited for investigating how inflammation and the tumor microenvironment regulate TNFα. Furthermore, the cell line is suitable for screening substances—such as natural products, small-molecule compounds, antibodies, or nucleic acid-based therapeutics—that may inhibit or enhance TNFα expression. The assay provides rapid and clear readouts, serving as an effective screening tool prior to downstream quantification of secreted proteins via ELISA (enzyme-linked immunosorbent assay). In esophageal cancer research, mCherry labeling enables researchers to track cells in co-culture or *in vivo* experiments, while the luminescent signal serves as a quantitative experimental endpoint. As the signal in this cell line remains stable over multiple passages, it is suitable for both routine experiments and high-throughput screening, making it a versatile tool for mechanistic studies and drug discovery.