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Antifeedant and Antiviral Diterpenoids from the Fresh Roots of Euphorbia jolkinii.

Authors
  • Huang, Chun-Shuai
  • Luo, Shi-Hong
  • Li, Yao-Lan
  • Li, Chun-Huan
  • Hua, Juan
  • Liu, Yan
  • Jing, Shu-Xi
  • Wang, Ying
  • Yang, Min-Jie
  • Li, Sheng-Hong
Type
Published Article
Journal
Natural Products and Bioprospecting
Publisher
Springer-Verlag
Publication Date
Apr 01, 2014
Volume
4
Issue
2
Pages
91–100
Identifiers
DOI: 10.1007/s13659-014-0009-3
PMID: 24859600
Source
Medline
Keywords
License
Unknown

Abstract

The perennial herbaceous plant Euphorbia jolkinii (Euphorbiaceae) is a noxious weed widely distributed in the grasslands of northwestern Yunnan and has greatly threatened the local biodiversity. Phytochemical investigation on the fresh roots of E. jolkinii afforded six new diterpenoids 1, 2, 4-6, and 8, together with fifteen known diterpenoids. Their structures were elucidated on the basis of 1D and 2D NMR and other spectroscopic methods. Casbane, lathyrane, abietane, and ent-kaurane diterpenoids were reported from this plant for the first time. Selected compounds were evaluated for their antifeedant and anti-RSV (respiratory syncytial virus) activities. Compound 2 and ingenol (3) exhibited moderate antifeedant activity against a generalist insect herbivore, Spodoptera exigua, with EC50 values of 17.88 and 17.71 μg/cm(2) respectively. Compound 19 showed significant anti-RSV activity, with 50 % inhibition (IC50) value of 10.0 μM and selective index of 8.0. Compounds 1 and 2 were less active against RSV virus, both with IC50 value of 25 μM, and with selective indices of 1.0 and 3.2 respectively. These findings provided new evidence for the biological functions and utilization of the diversified diterpenoid metabolites in the roots of this rich but harmful plant.

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