Exploring Ascidian Toxins
A team from the University of South Florida has discovered that toxins from ascidians collected off the Antarctic coast can eliminate melanoma cells in lab mice. This breakthrough opens new possibilities for treating an aggressive form of skin cancer. Researchers are now working to synthetically replicate these toxins for further studies and clinical trials.
Scientists from the University of South Florida embarked on an expedition to Antarctica, where they gathered samples of ascidians—invertebrate marine animals also known as sea squirts. Chemistry professor Bill Baker explained that ascidians produce these toxins as a defense mechanism against predators. He emphasized that while the toxins kill melanoma cells, they do not harm the mice themselves.
'The good news is that the mice survived. Their cancer cells, however, did not. This indicates that the compound possesses physiological properties that allow it to function like a drug,' noted Bill Baker.
Studying ascidian toxins requires hundreds of milligrams or even grams of the compound. Yet, the collected ascidians—each roughly the size of a basketball—yield only a thousandth of the needed amount. 'We cannot harvest thousands of these specimens in Antarctica because it would harm the ecosystem. So we need to learn how to produce this substance in the lab,' added Bill Baker.
Notably, more than half of the drugs approved by the U.S. Food and Drug Administration are derived from natural sources. This underscores the importance of such research, as it could pave the way for new medications. For instance, 'amivantamab,' an injection therapy developed by Johnson & Johnson, has shown effectiveness in over 40% of patients with advanced head and neck cancer.
Research Outlook
Scientists are continuing to search for promising bioactive compounds in sponges, corals, ascidians, and other marine organisms, not just in Antarctica.
The study of ascidian toxins highlights the potential of natural compounds in fighting cancer, which could mark a significant step toward developing new therapies. Within the broader context of global medical efforts to discover novel drugs, this finding may deepen understanding of marine organisms' biological activity and their pharmaceutical applications. Successfully synthesizing these toxins in the lab could greatly accelerate the creation of effective treatments for melanoma and other cancers.