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Screening Bioactive Nanoparticles in Phagocytic Immune Cells for Inhibitors of Toll-like Receptor Signaling
Published on: July 26, 2017
[Establishment and application of TLR2 receptor-based cell screening model]
1State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China.
Yao Xue Xue Bao = Acta Pharmaceutica Sinica
|July 30, 2013
Summary
Researchers developed a novel cell screening system for Toll-like receptor 2 (TLR2) and identified a new peptide, C8, that binds to TLR2, activating immune signaling pathways.
Area of Science:
- Immunology
- Molecular Biology
- Biochemistry
Background:
- Toll-like receptor 2 (TLR2) activity is implicated in autoimmune diseases, cancer, and cardiovascular conditions.
- Developing effective screening models for TLR2 is crucial for understanding its role in disease pathogenesis.
Purpose of the Study:
- To establish a robust cell-based screening model for the human TLR2 receptor.
- To identify novel ligands that specifically bind to human TLR2 using the developed screening system.
Main Methods:
- Transfection of human embryonic kidney (HEK293) cells with plasmids encoding human TLR2 and co-receptors (CD14, TLR1, TLR6) under an NF-kappaB promoter.
- Isolation and characterization of stable cell clones.
- Biopanning a phage display peptide library (Ph.D.-7) to identify TLR2-binding peptides using the Rapid Analysis of Selective Interactive Ligands (BRASIL) method.
- Validation of peptide binding and activity using ELISA, flow cytometry, immunofluorescence, and NF-kappaB luciferase assays.
Main Results:
- A stable cell line expressing human TLR2 and its co-receptors was successfully established.
- A novel human TLR2-binding peptide, designated C8, was identified from the phage display library.
- Peptide C8 demonstrated specific binding to human TLR2 and activated the TLR2/TLR1 signaling pathway.
- Activation by C8 induced the production of pro-inflammatory cytokines Tumor Necrosis Factor-alpha (TNF-alpha) and Interleukin-6 (IL-6).
Conclusions:
- The established TLR2 receptor-based cell screening system is effective for identifying TLR2-binding molecules.
- The novel peptide C8 represents a potential tool for modulating TLR2 activity and warrants further investigation in disease contexts.
