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Discovery of novel small molecule TLR4 inhibitors as potent anti-inflammatory agents

Yao Xu1, Shujun Chen1, Ying Cao1

  • 1Guangdong Provincial Key Laboratory of New Drug Screening and Guangzhou Key Laboratory of Drug Research for Emerging Virus Prevention and Treatment, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, 510515, China.

European Journal of Medicinal Chemistry
|May 29, 2018
PubMed

Insights

Novel Carvedilol derivatives were synthesized to inhibit Toll-like receptor 4 (TLR4) signaling. Compound 8a effectively blocked TLR4 and inflammatory markers, suggesting potential for inflammatory diseases and heart conditions.

Area of Science:

  • Immunology
  • Pharmacology
  • Medicinal Chemistry

Background:

  • Toll-like receptor 4 (TLR4) is crucial for innate immunity and linked to inflammatory diseases.
  • Carvedilol, an existing drug, shows inhibitory effects on TLR4 signaling.

Purpose of the Study:

  • To design and synthesize novel Carvedilol derivatives.
  • To investigate their potential as inhibitors of TLR4 signaling.
  • To explore new therapeutic applications for TLR4 inhibitors.

Main Methods:

  • Synthesis of a small library of Carvedilol derivatives.
  • Inhibition assays using HEK-Blue hTLR4 cells to assess TLR4 protein and LPS-triggered signaling.
  • Measurement of nitric oxide (NO) production in RAW264.7 and BV-2 cells.
  • Blocking of TNF-α signaling in human peripheral blood mononuclear cells (PBMC).
  • Binding affinity studies for hyperpolarization-activated cyclic nucleotide-gated (HCN) channels.

Main Results:

  • Compound 8a (SMU-XY3) demonstrated potent inhibition of TLR4 protein and LPS-induced alkaline phosphatase signaling.
  • Compound 8a effectively down-regulated nitric oxide (NO) in macrophage and microglial cell lines.
  • It blocked TNF-α signaling in ex-vivo human PBMCs.
  • Compound 8a exhibited higher affinity for HCN4 over HCN2.

Conclusions:

  • Compound 8a is a potent inhibitor of TLR4 signaling and associated inflammatory markers.
  • Its selective affinity for HCN4 suggests potential applications in cardiovascular conditions like heart failure and coronary heart disease.
  • These novel derivatives represent promising candidates for treating inflammatory diseases.
Keywords:
Anti-InflammatoryCarvedilol derivativeSmall molecule antagonistToll-like receptor 4

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