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Bioactive ent-kaurane diterpenoids from Isodon rubescens.

Yuan-Yuan Zhang1, Hua-Yi Jiang2, Miao Liu2

  • 1State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201, People's Republic of China; University of Chinese Academy of Sciences, Beijing, 10039, People's Republic of China; Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201, People's Republic of China.

Phytochemistry
|September 5, 2017
PubMed
Summary

Seven new diterpenoids from Isodon rubescens, named isojiangrubesins A-G, show potent anticancer activity. These compounds effectively inhibited tumor cell growth and nitric oxide production in immune cells.

Keywords:
7,20-Epoxy-ent-kaurane diterpenoidsAnti-inflammatoryCytotoxicityIsodon rubescensLamiaceae

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Area of Science:

  • Natural Products Chemistry
  • Pharmacology
  • Medicinal Chemistry

Background:

  • Isodon rubescens is a traditional Chinese medicinal herb.
  • Diterpenoids are a class of natural products with diverse biological activities.
  • Exploring new compounds from medicinal plants can lead to novel therapeutic agents.

Purpose of the Study:

  • To isolate and characterize new diterpenoids from Isodon rubescens.
  • To evaluate the in vitro cytotoxicity of isolated compounds against human cancer cell lines.
  • To assess the anti-inflammatory potential of the compounds by measuring nitric oxide inhibition.

Main Methods:

  • Isolation of compounds using chromatographic techniques.
  • Structure elucidation through spectroscopic methods (NMR, MS) and X-ray crystallography.
  • In vitro cytotoxicity assays using MTT assay against five human tumor cell lines (HL-60, SMMC-7721, A-549, MCF-7, SW480).
  • Nitric oxide inhibition assay in lipopolysaccharide (LPS)-stimulated RAW264.7 macrophages.

Main Results:

  • Seven new 7,20-epoxy-ent-kaurane diterpenoids (isojiangrubesins A-G) were identified.
  • Seventeen known diterpenoids were also isolated.
  • Four of the isolated compounds demonstrated significant cytotoxicity against all tested cancer cell lines, with IC50 values between 0.5 and 6.5 μM.
  • The active compounds also exhibited strong inhibition of nitric oxide production.

Conclusions:

  • Isojiangrubesins A-G represent a novel class of diterpenoids with promising anticancer properties.
  • The study highlights the potential of Isodon rubescens as a source for discovering new chemotherapeutic agents.
  • The identified compounds warrant further investigation for their therapeutic efficacy and mechanisms of action.