Anti-inflammatory terpenoids from Cyperus rotundus rhizomes

Area of Science:

• Natural Product Chemistry
• Pharmacology
• Medicinal Chemistry

Background:

• Cyperus rotundus L. (Cyperaceae) is a medicinal plant with a history of traditional use.
• Phytochemical investigations aim to identify bioactive compounds from plant sources.
• Inflammation is a complex biological response implicated in various diseases.

Purpose of the Study:

• To isolate and characterize novel compounds from Cyperus rotundus rhizomes.
• To evaluate the anti-inflammatory potential of the isolated compounds.

Main Methods:

• Methanolic extraction of Cyperus rotundus rhizomes.
• Structure elucidation using advanced spectroscopic techniques (UV, IR, 1D/2D NMR, HRESIMS).
• In vitro anti-inflammatory assays measuring inhibition of PGE2, COX-2, and LOX-5.

Main Results:

• Isolation of a new norterpenoid, cyperalin A (1), with an unprecedented carbon skeleton, and sugetriol triacetate (2).
• Cyperalin A (1) exhibited significant inhibitory activity against PGE2 (IC50=0.22 µM), COX-2 (IC50=1.03 µM), and LOX-5 (IC50=1.37 µM).
• Sugetriol triacetate (2) also showed notable anti-inflammatory activity (IC50s 0.57-2.03 µM).

Conclusions:

• Cyperalin A represents a novel chemical entity with potent anti-inflammatory properties.
• Cyperus rotundus rhizomes are a valuable source of bioactive compounds for anti-inflammatory drug discovery.
• The isolated compounds warrant further investigation for therapeutic applications in inflammatory conditions.