Nanoburrs Offer Targeted Cardiovascular Treatment

Targeted nanoparticles that can cling to artery walls and slowly release medicine could offer an alternative to drug-releasing stents in some patients with clogged or damaged arteries, according to researchers at the Massachusetts Institute of Technology (MIT) and the Harvard Medical School. The research has been published in a January issue of the Proceedings of the National Academy of Sciences.

Coated with tiny protein fragments that enable them to stick to target proteins, the particles are known as ‘nanoburrs.’ The nanoburrs target the basement membrane, which lines the arterial walls, and is only exposed when those walls are damaged. According to the researchers, the nanoburrs can release their drug payload over several days and could be used to deliver drugs that target atherosclerosis and other inflammatory cardiovascular diseases.

Two of the researchers, Robert Langer, professor at the MIT, and Omid Farokhzad, associate professor at the Harvard Medical School, have previously developed nanoparticles that seek and destroy tumors. According to a press statement, however, the nanoburrs are the first particles that can target damaged vascular tissues.

Clogged and damaged arteries are usually treated via vascular stents. The nanoburrs could be used alongside these or used in areas not suitable for stents, such as near a fork in the artery.

In a news release issued by the MIT, Uday Kompella, professor of pharmaceutical sciences at the University of Colorado, also explained that the nanoburr’s structure should be easy to manufacture because the targeted peptides are attached to an outer shell and not directly to the drug-carrying core, which would require a more complicated chemical reaction. The design of the nanoburrs also reduces the risk of the nanoparticles bursting and releasing drugs prematurely.

The lead author of the paper also added in the press statement that the particles can be injected intravenously, which would prevent repeated and surgically invasive injections directly into the area that requires treatment.