Newswise CLEVELANDResearchers at Case Western Reserve University have used a unique method to safely deliver gene therapy to fight a rare, but irreversible, genetic eye disorder known as Stargardt disease.
By using chemically modified lipidsinstead of the viruses most commonly used as carriersStargardt disease did not return in animal models for up to eight months after treatment, said lead researcher Zheng-Rong Lu, the M. Frank Rudy and MargaretDomiter Rudy Professor ofBiomedical Engineering at the Case School of Engineering, with a dual appointment at the School of Medicine.
Lus research, recently published in the journal Molecular Therapy, was funded in part through a Gund-Harrington Scholar grant, a partnership between Harrington Discovery Institute at University Hospitals and the Foundation Fighting Blindness.
This grant provides innovative scientists like Dr. Lu both funding and drug development expertise to advance research that will defeat diseases that limit millions of people from experiencing the gift of sight, said Jonathan S. Stamler, MD, President, Harrington Discovery Institute and Robert S. and Sylvia K. Reitman Family Foundation Distinguished Chair of Cardiovascular Innovation at University Hospitals and Case Western Reserve University School of Medicine. It is very encouraging to see Dr. Lus work move closer to human trials.
A so-far incurable disorder
The research may give some hope to people with Stargardt disease, an inherited disorder of the retina also known as macular dystrophy or juvenile macular degeneration because it often surfaces during childhood or adolescence.
Although individuals with Stargardt disease rarely go completely blind, they progressively lose vision in both eyes, become very sensitive to light and, in some cases, develop color blindness.
Were really excited because there is a potential to help people with Stargardt, Lu said. But we believe this success could also apply to other disorders as a platform therapy for delivering other genes through the use of the lipids.
Lipids are simple organic compounds, or fatty acids, that are insoluble in water, including various natural oils, waxes and steroids.
Because they are basically unsaturated oil, the likelihood of damage to the eye is low, which isnt always true with the viral gene therapy, Lu said.
Gene therapy offers best hope
There are a lot of researchers trying to figure out how to treat this disease right now with little success, Lu said. The best hope is gene therapy.
Gene therapy is the technology in which genetic material is introduced into cells by an engineered carrier to compensate for abnormal genes or to make a beneficial protein.
The most successful gene therapy carriers so far have been certain viruses (the AAV, or adeno-associated virus, especially) because they can deliver the new gene by infecting the target cell.
But the Stargardt-associated gene, known as the ABCA4 gene, turns out to be too large to fit within that popular virus, Lu said.
Lu said other researchers have attempted to remedy that problem by splitting ABCA4 into pieces and then trying to reassemble it inside the eyewith limited success.
Other researchers have modified a larger virus to carry ABCA4 into the eyes, a technology tested in human trials as far back as 2011, but which still hasnt been fully commercialized.
He said he and his collaborators have also already met with investors to expedite the commercialization of the platform used for Stargardt.
Further, this gene therapy product could be classified as an orphan drug by the U.S. Food and Drug Administration (FDA) because Stargardt is a rare disease, increasing the likelihood of faster FDA approval after clinical trials, Lu said.
The non-viral gene therapy is also much more cost-effective for production than the virus-based therapy and has a potential to significantly reduce the high price of gene therapy in the eye, he said.
We think that within two to three years we could really be helping people after further demonstration of its safety and efficacy, Lu said.
MEDIA CONTACTS:
Michael Scott, Case Western Reserve University
216.368.1004, mike.scott@case.edu
Carly Belsterling, University Hospitals
412.889.8866, carly.belsterling@uhhospitals.org
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Case Western Reserve University
Case Western Reserve University is one of the country's leading private research institutions. Located in Cleveland, we offer a unique combination of forward-thinking educational opportunities in an inspiring cultural setting. Our leading-edge faculty engage in teaching and research in a collaborative, hands-on environment. Our nationally recognized programs include arts and sciences, dental medicine, engineering, law, management, medicine, nursing and social work. About 5,100 undergraduate and 6,200 graduate students comprise our student body. Visit case.edu to see how Case Western Reserve thinks beyond the possible.
Harrington Discovery Institute
The Harrington Discovery Institute at University Hospitals in Cleveland, OHpart of The Harrington Project for Discovery & Developmentaims to advance medicine and society by enabling our nations most inventive scientists to turn their discoveries into medicines that improve human health.The institute was created in 2012 with a $50 million founding gift from the Harrington family and instantiates the commitment they share with University Hospitals to a Vision for a Better World.
The Harrington Project for Discovery & Development
The Harrington Project for Discovery & Development (The Harrington Project), founded in 2012 by the Harrington Family and University Hospitals of Cleveland, is a $300 million national initiative built to bridge the translational valley of death. It includes the Harrington Discovery Institute and BioMotiv, a for-profit, mission-aligned drug development company that accelerates early discovery into pharma pipelines. For more information, visit:HarringtonDiscovery.org.
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