Cytotoxic gelsedine-type indole alkaloids from Gelsemium elegans

Area of Science:

• Natural Product Chemistry
• Pharmacology
• Medicinal Chemistry

Background:

• Gelsemium elegans is a plant species known for its complex alkaloid content.
• Indole alkaloids, particularly gelsedine-type, are of interest due to their diverse biological activities.
• Non-small-cell lung cancer (NSCLC) remains a major global health challenge, necessitating novel therapeutic agents.

Purpose of the Study:

• To isolate and characterize new gelsedine-type indole alkaloids from Gelsemium elegans.
• To evaluate the in vitro cytotoxic potential of the isolated compounds against human non-small-cell lung cancer cell lines.

Main Methods:

• Chemical investigation of the 95% ethanol extract of Gelsemium elegans aerial parts.
• Isolation and purification of compounds using chromatographic techniques.
• Structural elucidation employing 1D and 2D NMR, IR, UV, and HRESIMS spectral analyses.
• In vitro cytotoxic activity assays against five human NSCLC cell lines.

Main Results:

• Three new gelsedine-type indole alkaloids were isolated and identified: 14β-hydroxygelselenidine (1), 11-methoxygelseziridine (2), and 14β-hydroxygelsedethenine (3).
• Compound 3, 14β-hydroxygelsedethenine, demonstrated significant cytotoxic activity across all tested NSCLC cell lines.
• The IC50 values for compound 3 ranged from 8.3 to 9.8 μM, indicating potent anti-cancer effects.

Conclusions:

• Gelsemium elegans is a valuable source of structurally novel indole alkaloids.
• 14β-hydroxygelsedethenine exhibits promising cytotoxic properties against non-small-cell lung cancer cells.
• Further investigation into 14β-hydroxygelsedethenine as a potential lead compound for NSCLC therapy is warranted.