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Sesquiterpenes from Myrrh and Their ICAM-1 Inhibitory Activity In Vitro.

Katrin Kuck1, Guido Jürgenliemk1, Bartosz Lipowicz2

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PubMed
Summary
This summary is machine-generated.

Researchers isolated 16 sesquiterpenes from myrrh, including six new compounds and four new to the Commiphora genus. Some compounds showed moderate inhibition of the ICAM-1 molecule, suggesting anti-inflammatory potential.

Keywords:
CommiphoraICAM-1myrrhseco-sesquiterpenoidessesquiterpenes

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Area of Science:

  • Natural Product Chemistry
  • Phytochemistry
  • Medicinal Chemistry

Background:

  • Myrrh resin, derived from Commiphora species, is traditionally used for its medicinal properties.
  • Sesquiterpenes are a diverse class of natural products with a wide range of biological activities.
  • Understanding the chemical constituents of myrrh is crucial for elucidating its therapeutic effects.

Purpose of the Study:

  • To isolate and characterize sesquiterpenes from an ethanolic extract of myrrh resin.
  • To identify novel sesquiterpene structures and metabolites previously undescribed for the Commiphora genus.
  • To evaluate the inhibitory activity of isolated sesquiterpenes against the intercellular adhesion molecule-1 (ICAM-1) in vitro.

Main Methods:

  • Isolation of sesquiterpenes using chromatographic techniques including silica flash chromatography, counter-current chromatography (CPC), and preparative high-performance liquid chromatography (HPLC).
  • Elucidation of chemical structures using 1D and 2D Nuclear Magnetic Resonance (NMR) spectroscopy and high-resolution electrospray ionization mass spectrometry (HRESIMS).
  • In vitro assay to assess the inhibitory effects of compounds on ICAM-1 expression.

Main Results:

  • Sixteen sesquiterpenes were isolated from myrrh resin.
  • Six previously unknown compounds (1-6) and four metabolites new to the Commiphora genus (7, 10, 12, 13) were identified.
  • Novel sesquiterpenes 1 and 2 possess unprecedented carbon skeletons (9,10-seco-eudesmanes). Compound 3 is a 9,10 seco-guaian and the first identified peroxide from myrrh.
  • Compounds 1, 2, 4, 7-9, 11, 13-16 were tested for ICAM-1 inhibition.
  • Compound 7 and furanoeudesma-1,3-diene demonstrated moderate inhibition of ICAM-1 (IC50: 44.8 and 46.3 μM, respectively).

Conclusions:

  • The study successfully isolated and characterized a diverse array of sesquiterpenes from myrrh resin, including novel chemical entities.
  • The identification of new sesquiterpene skeletons expands our knowledge of natural product diversity.
  • The observed ICAM-1 inhibitory activity of certain sesquiterpenes provides insights into the anti-inflammatory mechanisms of myrrh and suggests potential therapeutic applications.