Scientists Synthesize Long-Sought-After Anticancer AgentTheAllINeed.com
(NC&T/YU) Chemists worldwide have been interested in lomaiviticin's potential anticancer properties since its discovery in 2001. But so far, they have been unable to obtain significant quantities of the compound, which is produced by a rare marine bacterium that cannot be easily coaxed into creating the molecule. For the past decade, different groups around the world have been trying instead to synthesize the natural compound in the lab, but without success.
Now a team at Yale, led by chemist Seth Herzon, has managed to create lomaiviticin aglycon for the first time, opening up new avenues of exploration into novel chemotherapies that could target cancer stem cells, thought to be the precursors to tumors in a number of different cancers including ovarian, brain, lung, prostate and leukemia. Their discovery appears online today in the Journal of the American Chemical Society.
"About three quarters of anticancer agents are derived from natural products, so there's been lots of work in this area," Herzon said. "But this compound is structurally very different from other natural products, which made it extremely difficult to synthesize in the lab."
In addition to lomaiviticin aglycon, Herzon's team also created smaller, similar molecules that have proven extremely effective in killing ovarian stem cells, said Gil Mor, M.D., a researcher at the Yale School of Medicine and Yale Cancer Center who is collaborating with Herzon to test the new class of molecules' potential as a cancer therapeutic.
The scientists are particularly excited about lomaiviticin aglycon's potential to kill ovarian cancer stem cells because the disease is notoriously resistant to Taxol and Carboplatin, two of the most common chemotherapy drugs. "Ovarian cancer has a high rate of recurrence, and after using chemotherapy to fight the tumor the first time, you're left with resistant tumor cells that tend to keep coming back," Mor explained. "If you can kill the stem cells before they have the chance to form a tumor, the patient will have a much better chance of survival - and there aren't many potential therapies out there that target cancer stem cells right now."
|Herzon (center), along with team members Christina Woo and Liang Lu, synthesized a naturally occurring anticancer compound that scientists worldwide have been trying to replicate in the lab for nearly a decade. (Photo: Yale U.)|
"A lot of blood, sweat and tears went into creating that bond," Herzon said. "After that, the rest of the process was relatively easy."
Next, the team will continue to analyze the compound to better understand what's happening to the stem cells at the molecular level. The team hopes to begin testing the compounds in animals shortly.
"This is a great example of the synergy between basic chemistry and the applied sciences," Herzon said. "Our original goal of synthesizing this natural product has led us into entirely new directions that could have broad impacts in human medicine."
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