TIR-199 shows promise in fighting renal cancer

Published on February 20, 2013 at 1:35 AM · No Comments

Chemists at the University of California, Riverside have developed a compound that holds much promise in the laboratory in fighting renal (kidney) cancer.

Named TIR-199, the compound targets the "proteasome," a cellular complex in kidney cancer cells, similar to the way the drug bortezomib, approved by the Food and Drug Administration, targets and inhibits the proteasome in multiple myeloma cells, a cancer coming from bone marrow.

Michael Pirrung, a distinguished professor of chemistry at UC Riverside, announced the development of TIR-199 in a lecture he gave on Feb. 19 at the 5th International Conference on Drug Discovery and Therapy, held in Dubai, UAE.

Operating like the garbage dump of a cell, the proteasome breaks down proteins. Drugs that block the action of proteasomes are called proteasome inhibitors, and have been shown to have activity against a variety of cancer cell lines, albeit with mixed results. For example, bortezomib, though effective against multiple myeloma, has many side effects because cells other than bone marrow cells are affected.

"The novel feature of our new proteasome inhibitor, TIR-199, is that it is nearly as potent as bortezomib, but is selective in inhibiting the growth of only renal cancer cell lines," Pirrung said. "It's what makes TIR-199 attractive."

The TIR-199 research project at UC Riverside began about four years ago after a multidisciplinary, international team reported on a class of compounds that act on the proteasome. These compounds are the "syringolin" natural products - such as a compound produced naturally by the wheat-infecting bacterium Pseudomonas syringae. TIR-199 is a synthetic relative of syringolin.

"At UCR we began to work on, and completed the synthesis of, two compounds from this class of compounds," Pirrung said. "Of the two, TIR-199 showed most promise."

Pirrung's lab first shipped TIR-199 samples to the University of Hawaii, Hilo, where Andr- Bachmann, an associate professor of pharmaceutical sciences and Pirrung's collaborator, studied TIR-199 in test-tube assays for how it worked against the proteasome. Bachmann then tested the compound against a limited number of cancer cell lines that showed that TIR-199 was effective against the cancer cells. What remained unclear, however, was if TIR-199 was toxic to normal cells.

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