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Sesquiterpenoids from Teucrium ramosissimum.

Hichem Henchiri1, Bernard Bodo, Alexandre Deville

  • 1FRE 3206 CNRS Molécules de Communication et Adaptation des Micro-organismes, Muséum National d'Histoire Naturelle, 61-63 rue Buffon, 75005 Paris, France.

Phytochemistry
|September 22, 2009
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Summary

Four compounds from Teucrium ramosissimum showed significant antiplasmodial activity against Plasmodium falciparum. These compounds demonstrated potent efficacy with no observed cytotoxicity in human lung cells.

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Area of Science:

  • Phytochemistry
  • Medicinal Chemistry
  • Parasitology

Background:

  • Teucrium ramosissimum is a plant species with potential medicinal properties.
  • Natural products are a source of novel therapeutic agents, including anti-malarial compounds.
  • Plasmodium falciparum causes severe malaria, necessitating new treatment strategies.

Purpose of the Study:

  • To isolate and identify bioactive compounds from Teucrium ramosissimum.
  • To evaluate the antiplasmodial activity of isolated compounds against Plasmodium falciparum.
  • To assess the cytotoxicity of active compounds on human cell lines.

Main Methods:

  • Bioguided fractionation of the EtOAc extract from aerial parts of Teucrium ramosissimum.
  • Structure elucidation using extensive spectroscopic studies (1D/2D NMR, MS).
  • In vitro antiplasmodial activity assay against Plasmodium falciparum and cytotoxicity testing on MRC-5 cells.

Main Results:

  • Isolation and identification of ten known and five new compounds, including sesquiterpenoids and flavonoids.
  • Four compounds, Homalomenol C, 4beta-hydroxy-11,12,13-trinor-5-eudesmen-1,7-dione, oxo-T-cadinol, and 1beta,4beta,6beta-trihydroxyeudesmane, exhibited significant antiplasmodial activity.
  • The active compounds showed IC(50) values between 1.2 and 5.0 microg/ml against Plasmodium falciparum.
  • No cytotoxicity was observed for the active compounds against the human diploid lung cell line MRC-5.

Conclusions:

  • Teucrium ramosissimum is a source of potent antiplasmodial sesquiterpenoids.
  • Homalomenol C, 4beta-hydroxy-11,12,13-trinor-5-eudesmen-1,7-dione, oxo-T-cadinol, and 1beta,4beta,6beta-trihydroxyeudesmane are promising candidates for further anti-malarial drug development.
  • The identified compounds possess a favorable safety profile with no observed cytotoxicity.