Human CLEC7A Stable Cell Line - A549

The CLEC7A gene, also known as Dectin-1, encodes a member of the C-type lectin domain family and serves as a major pattern recognition receptor (PRR) against fungal pathogens in the innate immune response. Dectin-1 is a transmembrane protein that specifically recognizes and binds to β-1,3-linked dextran, a major component of the cell walls of fungi such as Candida and Aspergillus. Upon ligand binding, Dectin-1 triggers an intracellular signaling cascade via its hemi-ITAM motif, thereby activating the Syk kinase and NF-κB pathways. This activation induces the production of pro-inflammatory cytokines, reactive oxygen species (ROS) generation, and the initiation of phagocytosis. Clinically, polymorphisms or defects in the CLEC7A gene are associated with increased susceptibility to chronic mucocutaneous candidiasis and invasive aspergillosis. In oncology, the role of Dectin-1 is complex; it can promote anti-tumor immunity by enhancing the activity of macrophages and natural killer cells (NK cells), but in some cases, its activation in the tumor microenvironment can also lead to the recruitment of immunosuppressive myeloid cells.

The stable human CLEC7A cell line constructed in the A549 context is an ideal model for studying the innate immune response of alveolar epithelium to inhaled fungal spores. A549 cells, representing type II alveolar cells, are among the earliest cells in the lungs to come into contact with fungal pathogens. By stably overexpressing human CLEC7A, this cell line allows researchers to analyze how to engineer epithelial cells to directly sense and respond to fungal β-glucan. This product is invaluable for developing novel antifungal immunotherapies and screening small molecules that can modulate the Dectin-1 signaling pathway to enhance pathogen clearance. The CLEC7A-A549 model is also an ideal platform for studying crosstalk between different pattern recognition receptors (PRRs) (such as TLR2 and Dectin-1) in the lung microenvironment. The stability of gene expression ensures the consistency of cell surface receptor density, providing the necessary reproducibility for standardized phagocytosis assays and cytokine profiling.