Neolignan and 3-Benzylchroman Derivatives From Celastrus orbiculatus Thunb

Area of Science:

• Natural Product Chemistry
• Medicinal Chemistry
• Pharmacology

Background:

• Celastrus orbiculatus Thunb. is a traditional medicinal plant with a complex phytochemical profile.
• Investigating its chemical constituents may lead to the discovery of novel bioactive compounds.
• Neolignans and homoisoflavones are classes of natural products known for diverse biological activities.

Purpose of the Study:

• To isolate and characterize new chemical entities from the ethyl acetate extract of Celastrus orbiculatus stems.
• To evaluate the cytotoxic potential of the isolated compounds against human gastric cancer cell lines.

Main Methods:

• Phytochemical investigation using solvent extraction and chromatographic separation techniques.
• Structure elucidation of isolated compounds through extensive spectroscopic (NMR, MS) and spectrometric analyses.
• Computational studies were employed for structural confirmation.
• Cytotoxicity assays were performed on AGS and HGC-27 human gastric cancer cell lines.

Main Results:

• Isolation of one new neolignan, celastorbiol A (1), and two new homoisoflavones, celastrones A (2) and B (3).
• Identification of five known 3-benzylchroman derivatives: 7,4'-dihydrohomoisoflavanone (4), 3-deoxysappanone B (5), 3'-deoxysappanone A (6), bonducelin (7), and sappanone A (8).
• Compounds 1, 6, and 8 demonstrated cytotoxic effects against AGS and HGC-27 cells, with IC50 values ranging from 42.82 ± 0.98 to 98.04 ± 1.33 µM.

Conclusions:

• The study successfully identified novel neolignan and homoisoflavone compounds from Celastrus orbiculatus.
• Celastorbiol A, 3'-deoxysappanone A, and sappanone A possess significant cytotoxic activity against human gastric cancer cell lines, suggesting potential therapeutic applications.
• Further research into these compounds may yield new leads for gastric cancer treatment.