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New enzyme targets for selective cancer therapies
Date:8/22/2014

euraminidase enzyme in cancer cells is just the first step in determining its potential as a therapy.

In its current form, the compound could not be used as a drug, Cairo explained, largely because it wasn't designed to breach the blood-brain barrier making it difficult to reach the target cells. The team in Milan had to use the compound in very high concentrations, he added.

The research advances our understanding of how important carbohydrates are to the function of cells. Although most of us think of glucose (blood sugar) as the only important sugar in biology, there is an entire area of research known as glycobiology that seeks to understand the function of complex carbohydrate structures in cells. Carbohydrate structures cover the surface of cells, and affect how cells interact with each other and with pathogens.

Scientists have known for decades that the carbohydrates found on cancer cells are very different from those on normal cells. For example, many cancers have different amounts of specific residues like sialic acid, or may have different arrangements of the same residues.

"The carbohydrates on the cell surface determine how it interacts with other cells, which makes them important in cancer and other diseases. So, if we can design compounds that change these structures in a defined way, we can affect those interactions," Cairo explained. "Finding new enzyme targets is essential to that process, and our work shows that we can selectively target this neuraminidase enzyme."

Although there has been a lot of work on targeting viral neuraminidase enzymes, Cairo's team has found inhibitors of the human enzymes. "The challenge in human cells is that there are four different isoenzymes. While we might want to target one for its role in cancer, hitting the wrong one could have harmful side-effects," he said.

The U of A team reached out to their colleagues in Milan who were studying the role of a specific neur
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Contact: Bryan Alary
bryan.alary@ualberta.ca
780-492-0436
University of Alberta
Source:Eurekalert  

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