Monoterpene indole alkaloids from Gelsemium elegans.

Area of Science:

• Natural Product Chemistry
• Pharmacology
• Medicinal Chemistry

Background:

• Gelsemium elegans is a plant source of bioactive indole alkaloids.
• Monoterpene indole alkaloids are a complex class of natural products with diverse biological activities.
• Previous research has explored the chemical constituents and pharmacological effects of Gelsemium species.

Purpose of the Study:

• To isolate and characterize new monoterpene indole alkaloids from Gelsemium elegans.
• To evaluate the anti-inflammatory and anti-proliferative activities of isolated compounds.
• To determine the structures and absolute configurations of novel compounds.

Main Methods:

• Isolation of compounds using chromatographic techniques.
• Structure elucidation using spectroscopic methods (UV, IR, HR-ESI-MS, NMR).
• Determination of absolute configurations via electronic circular dichroism (ECD) analysis.
• In vitro assays for anti-inflammatory and anti-proliferative activities.

Main Results:

• Two new monoterpene indole alkaloids, Eleganine A (1) and Eleganine B (2), were identified.
• Eleven known compounds (3-13) were also isolated from the plant.
• Compounds 1 and 2 possess a gelsenicine-related structure with an iridoid unit.
• None of the isolated compounds exhibited significant anti-inflammatory or anti-proliferative activity (IC50 > 50 μM).

Conclusions:

• The chemical investigation of Gelsemium elegans led to the discovery of two new monoterpene indole alkaloids.
• The isolated compounds, including the novel ones, did not demonstrate notable anti-inflammatory or glucose-induced mesangial cell proliferation inhibitory effects at the tested concentrations.
• Further research may be needed to explore other potential bioactivities or structural modifications of these alkaloids.