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New technique reliably detects enzyme implicated in cancer and atherosclerosis
Date:6/1/2010

An enzyme implicated in osteoporosis, arthritis, atherosclerosis and cancer metastasis cathepsin K -- eluded reliable detection in laboratory experiments in the past. Now, a research team at the Georgia Institute of Technology has developed an assay that reliably detects and quantifies mature cathepsin K using a technique called gelatin zymography.

"This assay is important because researchers and pharmaceutical companies need a dependable method for sensitively detecting a small amount of cathepsin K and quantifying its activity to develop inhibitors to the enzyme that can fight the diseases while minimizing side effects," said Manu Platt, an assistant professor in the Wallace H. Coulter Department of Biomedical Engineering at Georgia Tech and Emory University.

Cathepsin K is required to maintain adequate calcium levels in the body, but it can be highly destructive because it has the ability to break down bone by degrading collagen and elastin.

Platt described the cathepsin K detection protocol in the June issue of the journal Analytical Biochemistry. This research was funded by new faculty support from Georgia Tech, and the Facilitating Academic Careers in Engineering and Science Scholars (FACES) and Summer Undergraduate Research in Engineering (SURE) programs at Georgia Tech.

The benefits of this assay over existing techniques are numerous, according to Platt. The major advantage of this protocol, he said, is the definitive knowledge that mature cathepsin K is being detected in cells and tissues -- and not its immature form or one of the other 10 cathepsin varieties: B, H, L, S, C, O, F, V, X or W.

Another advantage of this technique is that it is more sensitive and less expensive than current, less reliable techniques. The new assay allows cathepsin K to be detected in quantities as small as a few femtomoles and does not require antibodies, which can be expensive and cannot be used acr
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Contact: John Toon
jtoon@gatech.edu
404-894-6986
Georgia Institute of Technology Research News
Source:Eurekalert  

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