Twelve New Seco-Pregnane Glycosides from Cynanchum taihangense

Area of Science:

• Natural Product Chemistry
• Medicinal Chemistry
• Pharmacology

Background:

• Steroidal glycosides are a class of natural products with diverse biological activities.
• Cynanchum taihangense is a plant species known to produce various bioactive compounds.
• Continued investigation is crucial for discovering novel compounds with therapeutic potential.

Purpose of the Study:

• To isolate and characterize new steroidal glycosides from Cynanchum taihangense.
• To evaluate the cytotoxic activity of the isolated compounds against human tumor cell lines.

Main Methods:

• Phytochemical investigation using 95% ethanol extract of Cynanchum taihangense.
• Structure elucidation of isolated compounds using 1D and 2D NMR, HR-ESI-MS, and chemical evidence.
• Cytotoxicity evaluation using MTT assay against HL-60, THP-1, and PC-3 cell lines.

Main Results:

• Twelve new seco-pregnane glycosides (cynataihosides I-L, M-T) and two known glycosides were isolated.
• Two new aglycones were identified among the isolated compounds.
• Compound 11 exhibited significant cytotoxicity against THP-1 (IC50 = 5.08 μm) and PC-3 (IC50 = 22.75 μm) cell lines.
• Compounds 3 and 14 showed moderate and selective cytotoxicity against HL-60 (IC50 = 17.78 μm) and THP-1 (IC50 = 16.02 μm) cell lines.

Conclusions:

• The study successfully isolated and characterized novel steroidal glycosides from Cynanchum taihangense.
• Compound 11 demonstrates promising cytotoxic activity, warranting further investigation for anticancer drug development.
• The findings contribute to the understanding of the chemical diversity and pharmacological potential of Cynanchum taihangense.