Modulation of CD14 and TLR4×MD-2 activities by a synthetic lipid A mimetic

Roberto Cighetti, Carlotta Ciaramelli, Stefania Enza Sestito, Ivan Zanoni, Łukasz Kubik, Ana Ardá-Freire, Valentina Calabrese, Francesca Granucci, Roman Jerala, Sonsoles Martín-Santamaría, Jesus Jiménez-Barbero, Francesco Peri

Research output: Contribution to journalArticle

Abstract

Monosaccharide lipid A mimetics based on a glucosamine core linked to two fatty acid chains and bearing one or two phosphate groups have been synthesized. Compounds 1 and 2, each with one phosphate group, were practically inactive in inhibiting LPS-induced TLR4 signaling and cytokine production in HEK-blue cells and murine macrophages, but compound 3, with two phosphate groups, was found to be active in efficiently inhibiting TLR4 signal in both cell types. The direct interaction between compound 3 and the MD-2 coreceptor was investigated by NMR spectroscopy and molecular modeling/docking analysis. This compound also interacts directly with the CD14 receptor, stimulating its internalization by endocytosis. Experiments on macrophages show that the effect on CD14 reinforces the activity on MD-2×TLR4 because compound 3's activity is higher when CD14 is important for TLR4 signaling (i.e., at low LPS concentration). The dual targeting of MD-2 and CD14, accompanied by good solubility in water and lack of toxicity, suggests the use of monosaccharide 3 as a lead compound for the development of drugs directed against TLR4related syndromes. It takes two: A rationally designed synthetic lipid A mimetic consisting of a diphosphorylated monosaccharide with two fatty acid chains is active in inhibiting LPS-dependent human and murine TLR4 activation in cells and stimulates CD14 internalization. The binding between the synthetic molecule and MD-2 was studied by NMR experiments and docking calculations.

Original languageEnglish
Pages (from-to)250-258
Number of pages9
JournalChemBioChem
Volume15
Issue number2
DOIs
Publication statusPublished - Jan 24 2014

Keywords

  • bioorganic chemistry
  • carbohydrates
  • drug design
  • molecular modeling
  • NMR

ASJC Scopus subject areas

  • Biochemistry
  • Organic Chemistry
  • Molecular Medicine
  • Molecular Biology

Fingerprint Dive into the research topics of 'Modulation of CD14 and TLR4×MD-2 activities by a synthetic lipid A mimetic'. Together they form a unique fingerprint.

  • Cite this

    Cighetti, R., Ciaramelli, C., Sestito, S. E., Zanoni, I., Kubik, Ł., Ardá-Freire, A., Calabrese, V., Granucci, F., Jerala, R., Martín-Santamaría, S., Jiménez-Barbero, J., & Peri, F. (2014). Modulation of CD14 and TLR4×MD-2 activities by a synthetic lipid A mimetic. ChemBioChem, 15(2), 250-258. https://doi.org/10.1002/cbic.201300588