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Healthbeat Report: Healing Genes

December 4, 2009 12:25:42 PM PST
Gene therapy reveals how a patient's own body may hold the key to treating medical problems.Doctors are using genes to help people with blindness, clogged arteries and other issues.

After years of complex research there are signs that gene therapy can fix what doctors once thought were untreatable diseases.

A man once blind can now see... and a women who had trouble walking... is now on her feet and working out with an intensity she never imagined.

Dale Turner was barely old enough to read when doctors told him his world would soon go dark.

"The doctors said I would be completely blind by age 10," said Dale Turner, eye patient.

He has an inherited form of blindness called Leber's Congenital Amaurosis. A defective gene prevents his retina from producing the nutrients his eyes need. This resulted in his vision being limited-- like looking down a gun barrel.

Dale thought he'd be legally blind for the rest of his life, until his parents heard about an experimental therapy -- injecting new, healthy genes into the eye.

In a trial, doctors injected hundreds of billions of copies of the working gene beneath the retina in the back of the eye. As a result, four out of six patients regained vision.

"The improvement in vision corresponded exactly where the genes were replacing the defective gene," said William Hauswrirth, PhD, UF College of Genetics.

Dale will never forget the first time he went outside after surgery.

"I could see colors like never before, and it was just like a blue sky I've never seen before, and I had this feeling, like what have I been missing out on this whole time," said Turner.

Currently there are more than 1,500 gene therapy trials now taking place around the world.

Eye diseases are the focus of just 17 but nearly 1,000 trials are searching for a gene treatment for cancer, and 140 trials are underway for heart conditions.

Brenda Hill's heart is counting on one of those trials. She has peripheral artery disease. The arteries that supply blood to her legs are blocked.

"Like a toothache that never stopped, just ached and ached, just wouldn't stop," said Hill, PAD patient.

Medication wasn't working, so she enrolled in a gene therapy trial. Doctors at Rush University Medical Center injected genes into her leg muscles with the hope to trigger the growth of new blood vessels.

"The genes are often little pieces of DNA that become incorporated with the cells of the legs or heart and once they get incorporated they are supposed to tell the cells to release growth factors that stimulate new blood vessel growth," said Dr. Jeffery Snell, Interventional Cardiologist, Rush Univ. Med. Ctr.

"Some of the results have been encouraging, and some of the results have been disappointing," said Dr. Snell.

In this trial, those who improved saw their endurance increased by only about five percent.

Researchers said the use of stem cells for growing new blood vessels -- which is a different approach-- may be showing more promise at this time.

But, other gene therapy studies to help hearts are still in the works.

Brenda believes the gene treatment worked for her. A few months after her injection, she went from hobbling to hopping across the dance floor. The treatment also cut her medication by half.

"Made me feel good, made me feel like I'm progressing. I'm not ready to sit down yet," said Hill.

HIV is one of the latest targets for gene therapy. A recent study showed an injection of an anti-HIV gene could make the body resist the AIDS virus.

UF College of Medicine

Gainesville, Florida

John Pastor

Media Relations

jdpastor@ufl.edu

352-273-5815

www.news.health.ufl.edu

Rush University Medical Center

Dr. Jeffery Snell

Dr. Gary Schaer

University Cardiologists

1725 W. Harrison Street, Suite 1159

Chicago, IL 60612

(312) 942-5020

Dr. Snell's Current Clinical Trials

ACT 1 Investigational Carotid Stenosis Trial: ACT 1 investigational trial for patients with asymptomatic carotid stenosis. www.rush.edu/rumc/page-1144692727766.html

Carotid Artery Stenosis Study: Cartoid RX ACCULINK/RX ACCUNET post approval trial to uncover unanticipated and rare events (CAPTURE 2). www.rush.edu/rumc/page-1144692728127.html

Novel Peripheral Arterial Disease (PAD) Study: Novel investigational therapy for the treatment of intermittent claudication for those who suffer from Peripheral Arterial Disease (PAD). www.rush.edu/rumc/page-1250883267027.htm

RIHVR Rush Interventional Heart & Vascular Research
(888) 352-RUSH

Contact_rush@rush.edu

Dr. Schaer's Current Clinical Trials

Marvel Stem Cell Treatment Study:Study of a stem cell treatment using an investigational injection catheter in post MI congestive heart failure patients. http://www.rush.edu/rumc/page-1226342913082.html

Acord Trial: Treatment Study for No-Option Heart Patients with Coronary Artery Disease: Injections into the heart with a human recombinant (protein) fibroblast growth factor (FGF- investigational compound) compared to placebo. The goal is to stimulate the growth of new blood vessels around blocked coronary arteries. http://www.rush.edu/rumc/page-1239655966016.html

Osiris PROCHYMAL® Stem Cell Treatment Study: Study of PROCHYMAL® (cultured adult human mesenchymal stem cells) administration to preserve or improve cardiac function following heart attack http://www.rush.edu/rumc/page-1254747668563.html


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