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Immunomodulatory proanthocyanidins from Ecdysanthera utilis.
Lie-Chwen Lin1, Yuh-Chi Kuo, Cheng-Jen Chou
1National Research Institute of Chinese Medicine, 155-1, Sec. 2, Li-Nung Street, Taipei (112), Taiwan, Republic of China. lclin@cma23.nricm.edu.tw
Journal of Natural Products
|April 27, 2002
Summary
Ecdysanthera utilis contains compounds that may modulate the immune system. Proanthocyanidin A1 suppressed human peripheral blood mononuclear cell proliferation and key cytokine production, suggesting immunomodulatory potential.
Area of Science:
- Phytochemistry
- Immunopharmacology
Background:
- Ecdysanthera utilis is a plant source of bioactive compounds.
- Proanthocyanidins are a class of polyphenols with diverse biological activities.
Purpose of the Study:
- To isolate and identify A-type proanthocyanidins from Ecdysanthera utilis.
- To evaluate the immunopharmacological activity of isolated compounds, particularly their effect on human peripheral blood mononuclear cells (PBMC).
Main Methods:
- Isolation and structural elucidation of compounds using chromatographic and spectroscopic techniques.
- Assessment of PBMC proliferation using (3)H-thymidine uptake assay.
- Measurement of cytokine production (interleukin-2 and interferon-gamma) via PBMC stimulation with phytohemagglutinin (PHA).
Main Results:
- Two new A-type proanthocyanidins (compounds 5 and 6) were identified, along with known compounds including proanthocyanidin A1 (3).
- Proanthocyanidin A1 (3) significantly suppressed PHA-activated PBMC proliferation.
- Compound 3 dose-dependently attenuated the production of interleukin-2 and interferon-gamma by PBMC.
Conclusions:
- Ecdysanthera utilis contains compounds with immunomodulatory properties.
- Proanthocyanidin A1 exhibits immunosuppressive effects by inhibiting PBMC proliferation and key cytokine release.