Cytotoxic triterpenoid saponins from Aesculus glabra Willd

Area of Science:

• Natural Products Chemistry
• Phytochemistry
• Medicinal Chemistry

Background:

• The genus Aesculus is known for its diverse saponin structures.
• Polyhydroxyoleanene saponins are a significant class of plant-derived compounds with potential bioactivity.

Purpose of the Study:

• To isolate and characterize acylated polyhydroxyoleanene saponins from Aesculus glabra seeds.
• To investigate the structural features of these saponins for chemical taxonomy.
• To evaluate the cytotoxic activity of the isolated saponins against specific cancer cell lines.

Main Methods:

• Isolation of saponins using chromatographic techniques.
• Structure elucidation through spectroscopic methods (NMR, MS) and chemical analysis.
• Cytotoxicity assays using A549 (lung carcinoma) and PC-3 (prostate cancer) cell lines.

Main Results:

• Twenty-four acylated polyhydroxyoleanene saponins were isolated.
• Sixteen new compounds, aesculiosides G1-G16, were identified and structurally characterized.
• Key structural features include specific glycosylation patterns and lack of 24-OH substitution.
• Cytotoxicity results showed GI50 values ranging from 5.4 to >25 μM against tested cancer cell lines.

Conclusions:

• The identified saponin structures contribute to the chemical taxonomy of the Aesculus genus.
• The isolated aesculiosides exhibit moderate cytotoxic effects against A549 and PC-3 cancer cells.
• This study expands the knowledge of Aesculus saponins and their potential pharmacological properties.