Human FAP Stable Cell Line - HEK293T

The Fibroblast Activation Protein (FAP) gene, also known as FAPalpha, seprase, or SIMP, encodes a homodimeric integral membrane serine protease. This protein is classified as a member of the dipeptidyl peptidase IV family and exhibits both dipeptidyl peptidase and endopeptidase activities. Under normal physiological conditions, FAP is expressed at very low levels in adult tissues, with its expression primarily restricted to certain mesenchymal cells during embryonic development. However, it becomes significantly upregulated in reactive stromal fibroblasts associated with epithelial cancers, in granulation tissue during wound healing, and in malignant cells of bone and soft tissue sarcomas. The Human FAP Stable Cell Line - HEK293T is generated by stably transfecting the HEK293T cell line with a human FAP expression construct, resulting in consistent, high-level surface expression of the functional FAP protein. HEK293T cells were chosen as the parental line due to their excellent transfectability, robust growth characteristics, and well-documented reliability in recombinant protein expression and cell-based assay development.

This cell line serves as a powerful tool for a wide range of research and drug discovery applications. It is particularly valuable for screening and characterizing FAP-targeted therapeutic candidates, including small molecule inhibitors, monoclonal antibodies, antibody-drug conjugates, and bispecific molecules. The stable, high-density surface expression of FAP allows for reliable binding and functional assays, such as flow cytometry, fluorescence microscopy, and cell-based ELISA, facilitating the evaluation of target engagement and specificity. Researchers can also use this line to assess FAP-dependent enzymatic activity, cell signaling, and downstream biological effects. In the context of cancer immunotherapy, the cell line supports the development of FAP-directed CAR-T cells and other adoptive cell therapies, as well as the validation of FAP-targeted imaging agents and radiopharmaceuticals. Additionally, the line can be employed in co-culture systems to model the tumor microenvironment and investigate the role of FAP in stromal-epithelial interactions, tumor invasion, and metastasis. The consistent and reproducible nature of this stable cell line makes it an essential resource for both basic research and preclinical drug development programs focused on FAP as a therapeutic target.