Diterpenoid alkaloids from Delphinium trichophorum

Area of Science:

• Natural Product Chemistry
• Medicinal Chemistry
• Pharmacology

Background:

• Delphinium species are a rich source of complex alkaloids with diverse biological activities.
• Diterpenoid alkaloids, particularly hetisine types, are known for their potential pharmacological properties.
• Nitric oxide (NO) production in macrophages is a key indicator of inflammation.

Purpose of the Study:

• To isolate and characterize new alkaloids from Delphinium trichophorum.
• To investigate the potential anti-inflammatory activity of isolated compounds.
• To evaluate the inhibitory effects against lipopolysaccharide (LPS)-induced nitric oxide production.

Main Methods:

• Isolation of alkaloids using chromatographic techniques.
• Structure elucidation via comprehensive spectroscopic methods (1D, 2D NMR, HR-ESI-MS) and single-crystal X-ray diffraction.
• In vitro bioactivity assay using RAW 264.7 macrophage cells stimulated with LPS.

Main Results:

• Three new hetisine type C20-diterpenoid alkaloids, trichophorines A-C (1-3), were identified.
• Nine known alkaloids (4-12) were co-isolated from the plant extract.
• None of the tested compounds exhibited significant inhibitory activity against LPS-induced NO production in macrophages.

Conclusions:

• The chemical investigation of Delphinium trichophorum yielded novel diterpenoid alkaloids.
• The isolated trichophorines and known alkaloids did not demonstrate anti-inflammatory potential in this specific assay.
• Further research may explore other biological activities or structural modifications of these alkaloids.