期刊
MOLECULAR PHARMACOLOGY
卷 72, 期 4, 页码 868-875出版社
AMER SOC PHARMACOLOGY EXPERIMENTAL THERAPEUTICS
DOI: 10.1124/mol.107.038349
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资金
- NIGMS NIH HHS [GM066119] Funding Source: Medline
- NIMH NIH HHS [MH081265, MH074404] Funding Source: Medline
We describe a successful application of beta-lactamase fragment complementation to high-throughput screening (HTS) for Toll-like receptor 4 (TLR4) signaling inhibitors. We developed a stable cell line, HeLa/CL3-4, expressing MyD88/Bla(a) and TLR4/Bla(b), in which the two beta-lactamase fragments complement with each other by virtue of spontaneous MyD88-TLR4 binding via their Toll/IL-1R (TIR) domains. Inhibition of the MyD88-TLR4 binding leads to the disruption of the enzyme complementation and a loss of the lactamase activity. We used a 384-well plate format to screen 16,000 compounds using this assay and obtained 45 primary hits. After rescreening these 45 hits and eliminating compounds that directly inhibited beta-lactamase, we had five candidate inhibitors. We show that these five act as inhibitors of TLR4-MyD88 binding and are variously effective at inhibiting lipopolysaccharide-stimulated cytokine release from RAW264.7 cells. One compound is effective near 100 nM. None of the compounds showed any cytotoxicity at 20 mu M.
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