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Taniguchi, M. et al.

Costunolide and dehydrocostus lactone as inhibitors of killing function of cytotoxic T lymphocytes.

Costunolide and dehydrocostus lactone were isolated from an extract of mokko (Saussurea lappa Clarke) as inhibitors of killing activity of cytotoxic T lymphocytes (CTL). Mokko lactone was also isolated as an inactive compound from the extract. The structure-activity relationship indicated that alpha-methylene-gamma-butyrolactone is required for the inhibitory effect. Costunolide markedly inhibited the granule exocytosis and the production of inositol phosphates in response to anti-CD3 monoclonal antibody (mAb) stimulation at a concentration that did not affect the binding of anti-CD3 mAb. Tyrosine phosphorylation induced by crosslinking of CD3 molecules was significantly inhibited by costunolide in a dose-dependent manner. These results suggest that costunolide inhibits the killing activity of CTL through preventing the increase in tyrosine phosphorylation in response to the crosslinking of T-cell receptors.[1]

References

Costunolide and dehydrocostus lactone as inhibitors of killing function of cytotoxic T lymphocytes. Taniguchi, M., Kataoka, T., Suzuki, H., Uramoto, M., Ando, M., Arao, K., Magae, J., Nishimura, T., Otake, N., Nagai, K. Biosci. Biotechnol. Biochem. (1995) [Pubmed]

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