Trypanosomicidal kaurane diterpenes from Wedelia paludosa

Area of Science:

• Phytochemistry and Natural Products
• Parasitology
• Medicinal Chemistry

Background:

• Investigated the ethanolic extract of Wedelia paludosa D.C. (Asteraceae) aerial parts for bioactive compounds.
• Focused on identifying compounds with trypanosomicidal activity against Trypanosoma cruzi, the etiological agent of Chagas' disease.

Discussion:

• Identified three diterpenes—ent-kaur-16-en-19-oic acid, ent-kaur-9(11),16(17)-dien-19-oic acid, and 3 alpha-angeloiloxy-ent-kaur-16-en-19-oic acid—as active compounds.
• Demonstrated significant in vitro activity against trypomastigotes of T. cruzi, with efficacy down to 0.68 mg/mL.
• Reported for the first time the trypanosomicidal activity of ent-kaur-9(11),16(17)-dien-19-oic acid and 3 alpha-angeloiloxy-ent-kaur-16-en-19-oic acids.

Key Insights:

• Wedelia paludosa D.C. is a source of novel diterpenes with potent trypanosomicidal properties.
• Ent-kaur-16-en-19-oic acid, ent-kaur-9(11),16(17)-dien-19-oic acid, and 3 alpha-angeloiloxy-ent-kaur-16-en-19-oic acid show promise for Chagas' disease treatment.
• Several other isolated compounds, including friedelan-3 beta-ol and beta-amyrin acetate, were found to be inactive.

Outlook:

• Further research into the mechanism of action of these active diterpenes.
• Potential for development of new therapeutic agents for Chagas' disease based on these natural compounds.
• Exploration of other plant parts or related species for additional bioactive compounds.