Immunosuppressive Effects of Gallic Acid and Chebulagic Acid on CTL-Mediated Cytotoxicity.

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  • Immunosuppressive Effects of Gallic Aci

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Abstract

Gallic acid (GA) and chebulagic acid (CA) were isolated from the extract of a herbal medicine, kashi (myrobalans : the fruit of Terminalia chebula) as active principles that blocked the cytotoxic T lymphocyte (CTL)-mediated cytotoxicity. GA and CA inhibited the killing activity of CD8+ CTL clone at IC50 values of 30 μM and 50 μM, respectively. Granule exocytosis in response to anti-CD3 stimulation was also blocked by GA and CA at the equivalent concentrations.

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