A drug that helps block the growth of cancer cells, irinotecan is derived from a tree with banana-shaped pods found only in China and Tibet and aptly called the "Chinese Happy Tree." Yet, this tree and many other potential sources of future treatments are endangered and could soon be gone forever.

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  Brightly-colored beetles or caterpillars feeding on a tropical plant may signal the presence of chemical compounds active against cancer and parasitic diseases, report researchers writing in the journal Frontiers in Ecology and the Environment. The discovery could help speed drug discovery. 

Scientists from the Smithsonian Tropical Research Institute (STRI) and other organizations collected beetles and caterpillars on plants that produce compounds with and without activity against various cancers and parasites. They found that insects showing warning coloration — bright colors and bold patterns — were significantly more common on plants that contained anti-cancer and anti-parasite compounds. There was no difference in abundance of plain-colored insects between plants with and without bioactivity.   new work suggests that a quick screen for insects with warning coloration on tropical plants may increase the efficiency of the search for compounds active against cancer and tropical parasitic disease by four-fold, another example of how ecology can contribute to the discovery of novel medicines. It's very gratifying to see that it works in the field." said Todd Capson, an Associate Scientist with STRI and a professor at McGill University who directed the project. "I am hopeful that other investigators will follow our lead and test our theory that insects can lead us to plants with disease fighting properties. Our work also demonstrates that the protection of tropical forests, not just the insects and plants, but at every level, has the potential to provide immeasurable benefits to human health." 

Funding for the study was provided by the U.S. National Institutes of Health, the U.S. National Science Foundation, the U.S. Department of Agriculture, the National Science and Engineering Research Council of Canada and a Levinson Fellowship from the STRI-McGill NEO program. 

Julie E. Helson, Todd L. Capson, Timothy Johns, Annette Aiello and Donald M.Windsor. 2009. Ecologically and evolutionarily guided bioprospecting: the use of aposematic insects as potential guides to tropical rain forest plants with activity against disease. Front. Ecol. Environ. 7, doi:10.1890/070189.