Anti-tumor 12-deoxyphorbol esters from Euphorbia cornigera

Area of Science:

• Natural Products Chemistry
• Pharmacology
• Molecular Biology

Background:

• Euphorbia species are a rich source of bioactive natural products.
• Diterpenoids, such as phorbol esters, are known for their diverse biological activities.

Purpose of the Study:

• To isolate and characterize new compounds from Euphorbia cornigera roots.
• To evaluate the cytotoxic and DNA-damaging activities of isolated compounds.

Main Methods:

• Isolation and structural elucidation using extensive NMR spectroscopy (1H, 13C, COSY-45, HOHAHA, HMQC, HMBC, NOE).
• Cytotoxicity assessment via MTT assay on human KB cells.
• Investigation of DNA synthesis inhibition using Trypan blue exclusion and Brd-U assays.

Main Results:

• Eleven compounds were isolated, including nine new diesters of 12-deoxyphorbol (1-10) and one acetyl derivative (11).
• Compounds 8-10 demonstrated significant cytotoxic activity with IC50 values of 0.8, 0.5, and 1.0 microg/mL, respectively.
• Compounds 8-10 inhibited DNA synthesis and induced DNA cross-linking and strand breaks, correlating with their cytotoxicity.

Conclusions:

• The isolated 12-deoxyphorbol derivatives possess potent cytotoxic properties against human KB cells.
• The mechanism of cell death involves DNA damage, including cross-linking and strand breaks.
• These findings suggest potential therapeutic applications for these compounds in cancer treatment.