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Breakthrough gene therapy prevents retinal degeneration
Date:8/16/2010

BOSTON (August 16, 2010) In one of only two studies of its kind, a study from researchers at Tufts University School of Medicine and the Sackler School of Graduate Biomedical Sciences at Tufts demonstrates that non-viral gene therapy can delay the onset of some forms of eye disease and preserve vision. The team developed nanoparticles to deliver therapeutic genes to the retina and found that treated mice temporarily retained more eyesight than controls. The study, published online in advance of print in Molecular Therapy, brings researchers closer to a non-viral gene therapy treatment for degenerative eye disorders.

"Our work shows that it is possible to attain therapeutic results using non-viral gene delivery methods, specifically, nanoparticles. Nanoparticles, which are small enough to penetrate cells and stable enough to protect DNA, are capable of preventing retinal cell death and preserving vision," said senior author Rajendra Kumar-Singh, PhD, associate professor of ophthalmology at Tufts University School of Medicine (TUSM) and member of the genetics; neuroscience; and cell, molecular, and developmental biology program faculties at the Sackler School of Graduate Biomedical Sciences at Tufts.

"The most common approach to gene therapy involves using a virus to deliver DNA to cells. While viruses are very efficient carriers, they can prompt immune responses that may lead to inflammation, cancer, or even death. Non-viral methods offer a safer alternative, but until now, efficiency has been a significant barrier," said Kumar-Singh.

In a model simulating the progression of human retinal degeneration, the researchers treated mice with nanoparticles carrying a gene for GDNF (Glial Cell Line-Derived Neurotrophic Factor), a protein known to protect the photoreceptor cells in the eye. Retinas treated with the GDNF-carrying nanoparticles showed significantly less photoreceptor cell death than controls. Preservation of these cel
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Contact: Siobhan Gallagher
617-636-6586
Tufts University, Health Sciences
Source:Eurekalert  

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