Two new polyoxy steroidal glycosides from the roots of Dregea sinensis Hemsl

Isolation of a new steroid from phytochemical investigation on Caralluma lasiantha

A new steroid (acylated C21 pregnane steroid) was isolated from chloroform extract in phytochemical screening of Caralluma lasiantha. The isolated compound is found to be 3β-hydroxy-14β-(6'- carboxyphenyl)propionyloxypregn-5-en-20-one based on spectroscopic studies (IR, 1H NMR, 13C NMR, DEPT, COSY, HSQC, HMBC and ESI-MS). The isolated new steroid was tested against four bacterial strains and the activity was related to the structure of the molecule.

Diterpenoids from Euphorbia helioscopia and their enhancement of NK cell-mediated killing of NSCLC cells

Fourteen previously undescribed diterpenoids, including an unusual diterpenoid (1) with a 9,10-seco-jatrophane skeleton, ten jatrophane-type diterpenoids (2-11), two lathyrane-type diterpenoids (12, 13), and an abietane-type diterpenoid (14), together with thirty-six known ones (15-50), were isolated from the whole plants of Euphorbia helioscopia L. The structures of the new isolates were characterized by spectroscopic methods, single-crystal X-ray diffraction analysis, and computational prediction of ECD and chemical shifts. Thirty-nine abundant diterpenoids were evaluated for their enhancement of NK cell-mediated killing of NSCLC cells. As a result, compounds 24, 33, and 41 were found to significantly enhance the killing activity of NK cells towards H1299-luci cells and A549-luci cells at the concentration of 2.5 μM.