Biological Evaluation and Docking Studies of Synthetic Oleanane-type Triterpenoids

Area of Science:

• Medicinal Chemistry
• Organic Synthesis
• Cancer Biology

Background:

• Saponins exhibit broad-spectrum antitumor activity.
• Copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) enables synthesis of complex saponin analogs.
• Maslinic acid (MA) and oleanolic acid (OA) are triterpene aglycones with potential therapeutic applications.

Purpose of the Study:

• To synthesize novel saponin-like compounds using CuAAC.
• To evaluate the antitumor activity of synthesized compounds against T-84 colon carcinoma cells.
• To investigate the potential molecular targets, including NF-κB signaling.

Main Methods:

• Regioselective glycosylation of MA and OA using CuAAC.
• Biological evaluation using T-84 human colon carcinoma cell line.
• Molecular docking studies to assess NF-κB as a potential target.

Main Results:

• Compound 18 (OA with α-d-mannose at C28) showed significant inhibition of colon cancer cells, comparable to ginsenoside Rh2.
• Inhibition occurred via G1-S phase transition arrest, affecting cell viability and inducing apoptosis.
• Docking studies suggested MA and compound 18 bind to the p52 subunit of NF-κB, indicating it as a potential target.

Conclusions:

• Synthesized saponin analogs possess promising antitumor properties against colon cancer.
• The C2/C3 hydroxyl groups and C28 substituents are crucial for activity.
• NF-κB signaling is a likely molecular target for MA and compound 18.