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Novel nanotherapeutic delivers clot-busting drugs directly to obstructed blood vessels
Date:7/5/2012

Researchers at the Wyss Institute for Biologically Inspired Engineering at Harvard University have developed a novel biomimetic strategy that delivers life-saving nanotherapeutics directly to obstructed blood vessels, dissolving blood clots before they cause serious damage or even death. This new approach enables thrombus dissolution while using only a fraction of the drug dose normally required, thereby minimizing bleeding side effects that currently limit widespread use of clot-busting drugs.

The research findings, which were published online today in the journal Science, have significant implications for treating major causes of death, such as heart attack, stroke, and pulmonary embolism, that are caused by acute vascular blockage by blood thrombi.

The inspiration for the targeted vascular nanotherapeutic approach came from the way in which normal blood platelets rapidly adhere to the lining of narrowed vessels, contributing to the development of atherosclerotic plaques. When vessels narrow, high shear stresses provide a physical cue for circulating platelets to stick to the vessel wall selectively in these regions. The vascular nanotherapeutic is similarly about the size of a platelet, but it is an aggregate of biodegradable nanoparticles that have been coated with the clot-busting drug, tissue plasminogen activator (tPA). Much like when a wet ball of sand breaks up into individual grains when it is sheared between two hands, the aggregates selectively dissociate and release tPA-coated nanoparticles that bind to clots and degrade them when they sense high shear stress in regions of vascular narrowing, such as caused by blood clot formation.

Disruption of normal blood flow to the heart, lung, and brain due to thrombosis is one of the leading causes of death and long-term adult disability in the developing world. Today, patients with pulmonary embolism, strokes, heart attacks, and other types of acute thrombosis leading to
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Contact: Twig Mowatt
twig.mowatt@wyss.harvard.edu
Wyss Institute for Biologically Inspired Engineering at Harvard
Source:Eurekalert  

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