Antioxidant enzyme-containing particles may help repair injured heart

Washington, Nov 16 (ANI): A new study has shown that microscopic polymer beads, developed by researchers at Emory University and the Georgia Institute of Technology, can help deliver an antioxidant enzyme made naturally by the body into injured heart cells.

The researchers found that injecting the enzyme-containing particles into rats' hearts after a simulated heart attack reduced the number of dying cells and resulted in improved heart function days later.

The enzyme in the particles, called superoxide dismutase (SOD), soaks up toxic free radicals produced when cells are deprived of blood during a heart attack.

"Our goal is to have a therapy to blunt the permanent damage of a heart attack and reduce the probability of heart failure later in life," said Michael Davis, an assistant professor in the Wallace H. Coulter Department of Biomedical Engineering at Georgia Tech and Emory University.

"This is a way to get extra amounts of a beneficial antioxidant protein to the cells that need it," he added.

Davis said that the simulated heart attacks caused a 20 percent decrease in the ability of the rats' hearts to pump blood that was completely prevented by the particles.

The particles are made of a material called polyketals, developed by Niren Murthy, assistant professor of biomedical engineering at Georgia Tech and Emory.

The polyketals encase the enzyme and are taken up by cells within the heart. There the particles slowly release the enzyme.

The microparticles break down into nontoxic components in the body-an advantage over other biodegradable polymers like PLGA (polylactic-co-glycolic acid), already approved for use in sutures and grafts.

When polymers such as PLGA are made into particles for drug delivery, they can induce inflammation.

Davis and his colleagues have also used the polyketal microparticles to encase anti-inflammatory drugs.

This is the first report on the antioxidant enzyme-containing particles' use in a model of heart attack.

Although the SOD particles had a protective effect when the heart was examined three days after the simulated heart attack, the beneficial effects weren't as strong three weeks later.

Davis said that the rats' hearts still had a 35 percent improvement compared to untreated animals. Combining them with microparticles containing the anti-inflammatory drugs proved to provide an additional boost.

"This is likely because it is important to scavenge free radicals at early time points, but inflammation becomes more important later on," he said.

The study has been presented at the American Heart Association Scientific Sessions in Orlando. (ANI)