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Cytotoxic ent-kaurane diterpenoids from Isodon wikstroemioides.

Hai-Yan Wu1, Rui Zhan, Wei-Guang Wang

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This study isolated 18 new ent-kaurane diterpenoids from Isodon wikstroemioides. Several compounds showed significant cytotoxicity against human tumor cell lines and inhibited nitric oxide production.

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Area of Science:

  • Phytochemistry
  • Natural Products Chemistry
  • Pharmacology

Background:

  • Isodon wikstroemioides is a plant species known for its potential medicinal properties.
  • Diterpenoids, particularly ent-kaurane derivatives, are a class of natural products with diverse biological activities.
  • Understanding the chemical constituents and bioactivity of I. wikstroemioides can lead to the discovery of new therapeutic agents.

Purpose of the Study:

  • To conduct a phytochemical investigation of the EtOAc extracts of the aerial parts of Isodon wikstroemioides.
  • To isolate and characterize new and known ent-kaurane diterpenoids.
  • To evaluate the cytotoxic and anti-inflammatory potential of the isolated compounds.

Main Methods:

  • Extraction of aerial parts of I. wikstroemioides using ethyl acetate.
  • Isolation and purification of compounds using chromatographic techniques.
  • Structure elucidation of new compounds using spectroscopic methods (NMR, MS).
  • Confirmation of absolute configurations using single-crystal X-ray diffraction analysis.
  • Cytotoxicity screening against five human tumor cell lines (MTT assay).
  • Nitric oxide inhibition assay in lipopolysaccharide (LPS)-activated RAW264.7 macrophages.

Main Results:

  • Eighteen new ent-kaurane diterpenoids, named wikstroemioidins E-V (1-18), were isolated.
  • Seventeen known analogues (19-35) were also identified.
  • Compounds 3, 4, 9, 11-13, 23, 25-28, and 33 demonstrated significant cytotoxic activity against all five tested human tumor cell lines, with IC50 values between 0.4 and 5.1 μM.
  • Seventeen isolates exhibited strong inhibition of nitric oxide production in LPS-activated RAW264.7 macrophages.

Conclusions:

  • The phytochemical investigation of Isodon wikstroemioides led to the discovery of novel ent-kaurane diterpenoids.
  • Several isolated compounds possess potent cytotoxic and anti-inflammatory properties.
  • These findings highlight the potential of I. wikstroemioides as a source of new anticancer and anti-inflammatory agents.