Triterpenes from Kadsura coccinea.

Area of Science:

• Pharmacology
• Natural Products Chemistry
• Immunology

Background:

• Medicinal herbal extracts are screened for anti-allergic properties.
• Nitric oxide (NO) production is a key mediator in allergic inflammation.
• Murine macrophage cell lines like RAW264.7 are utilized for in vitro immunological studies.

Purpose of the Study:

• To investigate the in vitro anti-allergic activity of Kadsura coccinea rhizome extracts.
• To isolate and characterize compounds from the active extract.
• To evaluate the isolated compounds for their inhibitory effects on nitric oxide production.

Main Methods:

• In vitro anti-allergic screening of herbal extracts.
• Nitric oxide production assay in LPS and IFN-γ activated RAW264.7 cells.
• Fractionation of EtOAc extract and isolation of compounds using chromatographic techniques.
• Structural elucidation of isolated compounds (new and known triterpenes).

Main Results:

• The 80% acetone extract of Kadsura coccinea rhizome inhibited nitric oxide production in activated RAW264.7 cells.
• One new 3,4-seco-lanostane type triterpene, kadsuracoccin acid A, was isolated.
• Two known triterpenes, anwuweizonic acid and neokadsuranic acid B, were also identified.
• Isolated compounds 1-3 did not show inhibitory activity against NO production or IFN-γ activation.

Conclusions:

• The crude extract of Kadsura coccinea rhizome possesses anti-allergic properties, likely due to compounds other than the isolated triterpenes.
• Further investigation is needed to identify the specific active components responsible for the NO inhibitory effect in the crude extract.
• The isolated triterpenes, kadsuracoccin acid A, anwuweizonic acid, and neokadsuranic acid B, do not contribute to the observed anti-allergic activity in this assay.