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Research discovery may lead to advances in heart disease and cancer treatment
Date:4/14/2010

New Orleans, LA Research led by T. Cooper Woods, PhD, Assistant Professor of Pharmacology and Experimental Therapeutics at LSU Health Sciences Center New Orleans, and Director of the Molecular Cardiology Research Laboratory at Ochsner Clinic Foundation, has identified the mechanism of how a drug commonly used on stents to prevent reclosure of coronary arteries, regulates cell movement which is critical to wound healing and the progression of diseases like cancer. The study is published in the April 16th issue of the Journal of Biological Chemistry.

The antibiotic, rapamycin, is used on drug-eluting stents implanted during angioplasty because it is effective in preventing restenosis (re-narrowing or reclosure) of arteries. However, rapamycin can also prevent tissue from growing over and covering the metal stents, a critical part of the artery's healing after angioplasty. Without this protective covering, blood clots can develop many months later, called late stent thrombosis. These clots can lead to a heart attack.

"Late stent thrombosis has emerged as a major factor diminishing the benefits of drug-eluting stents, highlighting the need for a better understanding of the antimigratory mechanism of rapamycin and its analogs," notes Dr. Woods.

Through a series of experiments, the researchers found that by silencing a protein made by cells exposed to mTOR inhibitors, a class of drugs including rapamycin, they could block rapamycin's inhibitory effect on cell migration.

"We identified specific changes in proteins that a class of drugs, called mTOR inhibitors, uses to block cell movement," said Dr. Woods. "This knowledge will help us to better design strategies to help arteries heal following angioplasty or to prevent tumor growth."

Studies like this one often have application beyond the original research question because they identify basic mechanisms involved in many biologic processes. Cell migration in canc
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Contact: Leslie Capo
lcapo@lsuhsc.edu
504-568-4806
Louisiana State University Health Sciences Center
Source:Eurekalert

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