PUBLIC RELEASE DATE:
1-Apr-2014
Contact: Sandy Van sandy@prpacific.com 808-526-1708 Cedars-Sinai Medical Center
LOS ANGELES (April 1, 2014) The Cedars-Sinai Regenerative Medicine Institute has received a $2.5 million grant from the Department of Defense to conduct animal studies that, if successful, could provide the basis for a clinical trial of a gene therapy product for patients with Lou Gehrig's disease, also called amyotrophic lateral sclerosis, or ALS.
The incurable disorder attacks muscle-controlling nerve cells motor neurons in the brain, brainstem and spinal cord. As the neurons die, the ability to initiate and control muscle movement is lost. Patients experience muscle weakness that steadily leads to paralysis; the disease usually is fatal within five years of diagnosis. Several genes have been identified in familial forms of ALS, but most cases are caused by a complex combination of unknown genetic and environmental factors, experts believe.
Because ALS affects a higher-than-expected percentage of military veterans, especially those returning from overseas duties, the Defense Department invests $7.5 million annually to search for causes and treatments. The Cedars-Sinai study, led by Clive Svendsen, PhD, professor and director of the Regenerative Medicine Institute at Cedars-Sinai Medical Center, and Genevive Gowing, PhD, a senior scientist in his laboratory, also will involve a research team at the University of Wisconsin, Madison and a Netherlands-based biotechnology company, uniQure, that has extensive experience in human gene therapy research and development.
The research will be conducted in laboratory rats bred to model a genetic form of ALS. If successful, it could have implications for patients with other types of the disease and could translate into a gene therapy clinical trial for this devastating disease.
It centers on a protein, GDNF, that promotes the survival of neurons. In theory, transporting GDNF into the spinal cord could protect neurons and slow disease progression, but attempts so far have failed, largely because the protein does not readily penetrate into the spinal cord. Regenerative Medicine Institute scientists previously showed that spinal transplantation of stem cells that were engineered to produce GDNF increased motor neuron survival, but this had no functional benefit because it did not prevent nerve cell deterioration at a critical site, the "neuromuscular junction" the point where nerve fibers connect with muscle fibers to stimulate muscle action.
Masatoshi Suzuki, PhD, DVM, assistant professor of comparative biosciences at the University of Wisconsin, Madison, who previously worked in the Svendsen Laboratory and remains a close collaborator, recently found that stem cells derived from human bone marrow and engineered to produce GDNF protected nerve cells, improved motor function and increased lifespan when transplanted into muscle groups of a rat model of ALS.
"It seems clear that GDNF has potent neuroprotective effects on motor neuron function when the protein is delivered at the level of the muscle, regardless of the delivery method. We think GDNF will be able to help maintain these connections in patients and thereby keep the motor neuron network functional," Suzuki said.
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$2.5 million Defense Department grant funds gene therapy study for Lou Gehrig's disease
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