Claude Prigent
Institute of Genetics and Development of Rennes, France
Title: Is Aurora-A kinase as good biomarker and why?
Biography
Biography: Claude Prigent
Abstract
Aurora-A serine threonine kinase is a key player in cell cycle controls and essential for the progression through mitosis. It was found over-expressed in many human cancers. A gain of activity was proved to favour chromosome instability and carcinogenesis in mice. More importantly its over-expression was also reported to lead to resistance to drugs such as microtubule poisons used in chemotherapy. Additionally a loss of Aurora-A activity leads to uncontrolled stem cells proliferation at the origin of cancers in Drosophila and presumably in mice too. Aurora-A kinase has been a priority target for the development of inhibitors to be used in cancer treatment. Using a chemical-genetic approach, we investigated the effects of a specific inhibition of Aurora-A kinase during cell cycle progression, in particular during mitosis, in normal conditions but also in the presence of taxol or nocodazole. At the contrary to previous reports, we found that Aurora-A kinase activity was essential to arrest the cells in mitosis in response to taxol or nocodazol. An inhibition of Aurora-A in the presence of these drugs clearly leads to abortive mitosis, and formation of polyploidy cells.
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