Abstract
Camptothecin and taxol are secondary metabolites found, respectively, in the wood bark of Camptotheca acuminata, a native of China, and Taxus brevifolia, found in the northwest Pacific coastal region of the United States. The compounds were isolated guided by bioassay on various extracts and chromatographic fractions. Their unique and hitherto unknown structures were elucidated by nuclear magnetic resonance, mass spectrometry, and X-ray analysis. Both compounds have unique mechanisms of antitumor activity; camptothecin uniquely inhibits an enzyme, topoisomerase I, involved in DNA replication. Taxol binds to a protein, tubulin, thus inhibiting cell division. Taxol has been called the best new anticancer agent developed from natural products, showing particular efficacy against ovarian cancer. Camptothecin and analogues singly or combined with cisplatin show efficacy against solid tumors, breast, lung, and colorectal, which hitherto have been unaffected by most cancer chemotherapeutic agents.
Footnotes
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↵2 To whom requests for reprints should be addressed, at Chemistry and Life Sciences, Research Triangle Institute, P.O. Box 12194, 3040 Cornwallis Road, Research Triangle Park, NC 27709-2194.
- Received December 7, 1994.
- Accepted December 12, 1994.
- ©1995 American Association for Cancer Research.
Volume 55, Issue 4
