The transmembrane protein Fibroblast Activation Protein (FAP), a member of the dipeptidyl peptidase family, is expressed in the human FAP stable cell line KB via engineering. The FAP gene spans genomic coordinates from 162,170,684 to 162,243,445 (GRCh38) and is situated on chromosome 2q24.2. The FAP gene's open reading frame spans about 1800 base pairs and codes for a 619-amino acid protein. One DSL domain, one intracellular domain, and six domains resembling epidermal growth factor make up its entire structure.Among members of the FAP family, the DSL domain at the extracellular domain's N-terminus is highly conserved and necessary for binding to particular substrates. Since the intracellular domain of FAP is so brief, its precise purpose is still unknown. Research has shown that FAP is biasedly expressed in a number of tissues, including the gall bladder (RPKM 5.1), the endometrium (RPKM 7.5), and eleven additional tissues.
An oral cancer provided the human epithelial cell line known as KB cells. They can be grown in vitro using conventional cell culture methods and display adherent growth properties. These cells' genetic stability and ease of care make them popular for use in cancer research.
Among malignant tumors, hepatocellular carcinoma (HCC) has a high incidence rate. Hepatic stellate cells (HSCs) were the focus of the researchers' investigation into the functions of IL-17a and FAP in liver fibrosis and carcinogenesis. To evaluate the effects of IL-17a administration, IL-17a overexpression, and FAP upregulation in HSCs, they conducted both in vitro and in vivo investigations. The binding of STAT3 to the FAP promoter was verified by the CUT&RUN approach. According to in vitro findings, IL-17a stimulated HSCs, aiding in the onset and spread of hepatocellular carcinoma (HCC). Overexpression of FAP and IL-17a also promoted HSC activation, migration, and proliferation of HCC cells while preventing apoptosis. According to in vivo research, HSC overexpression of FAP and IL-17a promoted the growth of liver tumors. The study found that by activating STAT3, IL-17a increases FAP expression in HSCs, which in turn promotes HCC.
Figure 1. The researchers used lentiviral transfection to construct a FAP cell line that promoted LX2 cell proliferation and migration and inhibited apoptosis. Methods include CCK8, EdU, Transwell, scratch, TUNEL, and other experiments. (Sun D, et al., 2024)
1. Cancer Research: The stable expression of Fibroblast Activation Protein (FAP) in KB cells provides a robust model for studying FAP's role in tumorigenesis, particularly in oral cancer.
2. Drug Development: Used for screening potential therapeutic agents targeting FAP, facilitating the identification of drugs that could inhibit or modulate FAP activity in cancerous tissues.
3. Tissue-specific Expression Studies: Investigating FAP's expression and function in different tissues, including the gall bladder and endometrium, aids in understanding its role across various physiological and pathological conditions.
4. Cell Signaling Pathways: Analysis of the DSL domain and its substrate interactions enhances knowledge of cell signaling mechanisms, contributing to broader research in cell biology and protein function.
Customer Q&As
Has the FAP expression of this cell line been verified in detail? Can you provide specific verification data?
A: The FAP expression of Human FAP Stable Cell Line-KB has been verified in detail, including qPCR, Western Blot and flow cytometry. qPCR showed that there was no significant difference in the expression level of FAP mRNA in different passages, and Western Blot and flow cytometry results also showed that the expression of FAP protein was stable. Specific experimental data can be provided upon request.
What types of experiments is this cell line suitable for? Has it been functionally verified?
A: Human FAP Stable Cell Line-KB is suitable for FAP-related cancer research, drug screening and immunology research. Functional verification includes FAP enzyme activity measurement, cell invasion and migration experiments. The results show that the FAP expressed by this cell line has biological activity and is suitable for related research.
Does FAP expression from this cell line affect other properties of KB cells, such as growth rate or invasive ability?
A: We conducted cell proliferation, invasion and migration experiments, and the results showed that FAP expression has a certain impact on the growth rate and invasion ability of KB cells. The specific manifestation is that the invasion ability of FAP-expressing cells is enhanced and the proliferation rate is slightly increased. These data can provide reference in experimental design to ensure the accuracy of experimental results.
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Customer Reviews
Advanced tool
It is very easy to culture with KB cells, without the need for complex techniques and equipment. These cells show excellent adhesion and growth properties and can be easily cultured using traditional cell culture methods.
United Kingdom
12/13/2021
Research facilitator
The delivery speed is fast, and the growth characteristics of KB cells make them an ideal model for cancer research. Rapid cell proliferation and stability of cell morphology were observed.
Stable expression
KB cells show good stability, which allows them to be reliably cultured in a laboratory environment and provides a solid foundation for research. During the culture process, we observed consistent cell growth and stable gene expression.
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