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Gene therapy for hereditary lung disease advances

tein," Flotte said. "That's very encouraging to us. So the next trial, which has already begun, is to use the new version of the virus and take patients through a similar range of doses, in a very similar scheme, and see if we can maintain the safety while pumping up the efficiency of the protein production."

In most people, alpha-1 antitrypsin is made in the liver and protects the lungs by counteracting inflammatory products that destroy lung tissue. But about 100,000 Americans have alpha-1 antitrypsin deficiency, according to the Miami-based Alpha-1 Foundation, a national not-for-profit organization devoted to finding a cure. In addition, medical authorities suspect less than 5 percent of affected individuals are diagnosed, often not until they are in their mid- to late-30s, after extensive lung damage occurs. Shortness of breath, wheezing, chronic cough and recurring chest colds are signs of the disease.

It is important that alpha-1 patients avoid cigarette smoke, said Mark Brantly, M.D., a professor of medicine and molecular genetics and microbiology at UF's College of Medicine who develops clinical research programs aimed at developing therapies for alpha-1 patients. Alpha-1 deficiency can in some patients lead to emphysema and cirrhosis, both progressive diseases that can be fatal.

Alpha-1 patients with symptoms of emphysema can be treated through weekly intravenous injections of alpha-1 protein derived from human plasma. The injections must continue throughout a patient's life, according to the American Lung Association. It does not cure, but it does appear to slow the progression of this disease.

Patients in the clinical trial - 10 men and two women who ranged from 42 to 69 - were asked to discontinue their replacement therapy 28 days before receiving the gene therapy.

One volunteer who had not been on protein replacement therapy exhibited low-level expression of alpha-1 antitrypsin, which was detectable 30
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Source:University of Florida


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