An Assay to Screen Bioactive Nanoparticles for Toll-Like Receptor Signaling Inhibition
Published: January 31, 2024
Abstract
Source: Yang, H., et al. Screening Bioactive Nanoparticles in Phagocytic Immune Cells for Inhibitors of Toll-like Receptor Signaling. J. Vis. Exp. (2017).
This video demonstrates a reporter cell-based assay for screening potential bioactive nanoparticles that inhibit Toll-like receptor (TLR) signaling. The assay involves introducing lipopolysaccharides (LPS) mixed with peptide-gold nanoparticle hybrids to reporter macrophages expressing the reporter proteins — secreted embryonic alkaline phosphatase (SEAP) and luciferase. The reduction of LPS-induced TLR signal mediated by the hybrids is determined by measuring the reporter signals.
Protocol
1. Screening for Potential TLR4 Nano-inhibitors Using the Reporter Cells NOTE: Since TLR4 signaling utilizes both MyD88-dependent land TRIF-dependent pathways, it is selected as the primary target to encompass a wide range of TLR signaling pathways. THP-1-XBlue reporter cells are used to mainly examine the NF-κB/AP-1 activation while THP-1-Dual cells are for IRF activation from the TRIF-dependent signal transduction. Identify the optimal LPS d…
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The authors have nothing to disclose.
Materials
| THP-1-XBlue reporter cell | InvivoGen | thpx-sp | keep cell culture passage under 20 |
| THP-1-Dual repoter cell | InvivoGen | thpd-nfis | keep cell culture passage under 20 |
| RPMI-1640 (no L-glutamine) | GE Health Care | SH30096.02 | Warm up to 37 °C before use; add supplements to make a complete medium R10 |
| Fetal bovine serum (qualified) | Thermo Fisher Scientific | 12484028 | Heat inactivated; 10% in RPMI-1640 |
| L-glutamine | Thermo Fisher Scientific | SH30034.02 | 2 mM in the complete medium R10 |
| Sodium pyruvate | Thermo Fisher Scientific | 11360-070 | 1 mM in the complete medium R10 |
| Dulbecco's phosphate buffered saline, 1X, without calcium, magnesium | GE Health Care | SH30028.02 | Use for cell washing and reagent preparation |
| QUANTI-Blue | InvivoGen | rep-qb1 | SEAP substrate |
| QUANTI-Luc | InvivoGen | rep-qlc2 | Luciferase substrate |
| Zeocin | InvivoGen | ant-zn-1 | Selection antibiotics for reporter cells |
| Blasticidin | InvivoGen | anti-bl-1 | Selection antibiotics for reporter cells |
| Dimethyl sulfoxide (DMSO) for molecular biology | Sigmal-Aldrich | D8418-100ML | Use for reagent preparation |
| Lipopolysaccharide (LPS) from E. coli K12 | InvivoGen | tlrl-eklps | TLR4 ligand |
| Flagellin from S. Typhimurium (FLA-ST), ultrapure | InvivoGen | tlrl-epstfla | TLR5 ligand |
| SpectraMax Plus 384 microplate reader | Molecular Devices | N/A | Read colorimetric assay |
| Infinite M200 Pro multimode microplate reader with injectors | Tecan | N/A | Read luminiscience |
| Costar assay plate, 96-well white with clear flat bottom, tissue culure treated | Corning Costar | 3903 | Used for luminiscence assay |
