Anti-Inflammatory Dimeric and Trimeric Flavonoids from the Roots ofPistacia weinmannifolia

Area of Science:

• Phytochemistry
• Pharmacology
• Medicinal Chemistry

Background:

• Medicinal plants are a rich source of novel anti-inflammatory agents.
• Chronic obstructive pulmonary disease (COPD) pathogenesis involves significant pulmonary inflammation.

Purpose of the Study:

• To isolate and characterize new flavonoid compounds from Pistacia weinmannifolia roots.
• To evaluate the anti-inflammatory effects of these compounds in an airway epithelial cell model.

Main Methods:

• Isolation and structural elucidation of five new dimeric and trimeric flavonoids (1-5) using spectroscopic data.
• Identification of known compounds (6-8).
• In vitro anti-inflammatory assays using phorbol myristate acetate (PMA)-induced NCI-H292 cells.

Main Results:

• Five new dimeric and trimeric flavonoids (pistachalcone A-D, pistaflavanone A) were identified.
• Isolated compounds demonstrated anti-inflammatory effects by suppressing interleukin-8 (IL-8) and mucin 5AC (MUC5AC) expression.
• These suppressions are relevant to the inflammatory response in COPD.

Conclusions:

• Pistacia weinmannifolia roots yield novel dihydrochalcone derivatives with anti-inflammatory properties.
• These compounds may serve as valuable starting points for developing novel therapeutic agents for COPD.
• Targeting IL-8 and MUC5AC pathways offers a potential strategy for COPD treatment.