Transplanted neural stem cells treat ALS in mouse model

[barbara]

If the researchers believe that they may be ready to try this on clinical trials in humans, then I would hope they would move forward rapidly. I doubt there are any ALS patients who would turn down the opportunity to take part in such a trial.

Fierce BioTech
by Heather Buschman on December 19, 2012

In 11 independent studies, a consortium of ALS researchers shows that transplanting neural stem cells into the spinal cord of an ALS mouse model slows disease onset and progression, improves motor function, and significantly prolongs survival.

Amyotrophic lateral sclerosis (ALS), also known as Lou Gehrig's disease, is untreatable and fatal. Nerve cells in the spinal cord die, eventually taking away a person's ability to move or even breathe. A consortium of ALS researchers at multiple institutions, including Sanford-Burnham Medical Research Institute, Brigham and Women's Hospital, and the University of Massachusetts Medical School, tested transplanted neural stem cells as a treatment for the disease. In 11 independent studies, they found that transplanting neural stem cells into the spinal cord of a mouse model of ALS slows disease onset and progression. This treatment also improves host motor function and significantly prolongs survival.

Surprisingly, the transplanted neural stem cells did not benefit ALS mice by replacing deteriorating nerve cells. Instead, neural stem cells help by producing factors that preserve the health and function of the host's remaining nerve cells. They also reduce inflammation and suppress the number of disease-causing cells in the host's spinal cord. These findings, published December 19 in Science Translational Medicine, demonstrate the potential neural stem cells hold for treating ALS and other nervous system disorders.

"While not a cure for human ALS, we believe that the careful transplantation of neural stem cells, particularly into areas that can best sustain life—respiratory control centers, for example—may be ready for clinical trials," Evan Y. Snyder, M.D., Ph.D., director of Sanford-Burnham's Stem Cell and Regenerative Biology Program and senior author of the study.

Neural stem cells

In this study, researchers at multiple institutions conducted 11 independent studies to test neural stem cell transplantation in a well-established mouse model of ALS. They all found that this cell therapy reduced the symptoms and course of the ALS-like disease. They observed improved motor performance and respiratory function in treated mice. Neural stem cell transplant also slowed the disease's progression. What's more, 25 percent of the treated ALS mice in this study survived for one year or more—roughly three to four times longer than untreated mice.

Neural stem cells are the precursors of all brain cells. They can self-renew, making more neural stem cells, and differentiate, becoming nerve cells or other brain cells. These cells can also rescue malfunctioning nerve cells and help preserve and regenerate host brain tissue. But they've never before been studied extensively in a good model of adult ALS.

How neural stem cells benefit ALS mice

Transplanted neural stem cells helped the ALS mice, but not for the obvious reason—not because they became nerve cells, replacing those missing in the ALS spinal cord. The biggest impact actually came from a series of other beneficial neural stem cell activities. It turns out neural stem cells produce protective molecules. They also trigger host cells to produce their own protective molecules. In turn, these factors help spare host nerve cells from further destruction.

Then a number of other positive events take place in treated mice. The transplanted normal neural stem cells change the fate of the host's own diseased neural stem cells—for the better. This change decreases the number of toxin-producing, disease-promoting cells in the host's spinal cord. Transplanted neural stem cells also reduce inflammation.

"We discovered that cell replacement plays a surprisingly small role in these impressive clinical benefits. Rather, the stem cells change the host environment for the better and protect the endangered nerve cells," said Snyder. "This realization is important because most diseases are now being recognized as multifaceted in their cause and their symptoms—they don't involve just one cell type or one malfunctioning process. We are coming to recognize that the multifaceted actions of the stem cell may address a number of these disease processes."

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This research was funded by Project ALS, California Institute for Regenerative Medicine, the U.S. National Institutes of Health (National Institute of Neurological Disorders and Stroke grants R21NS053935, 1RC2NS070342-01, 1RC1NS068391-01, R01NS050557-05, U01NS05225-03), U.S. Department of Veterans Affairs, Christopher Reeve Foundation/American Paralysis Association, Sanford Children's Health Research Center, Zinberg Foundation, ALS Therapy Alliance, ALS Association, Angel Fund, Al-Athel Foundation, Pierre L. deBourgknect ALS Research Foundation, P2ALS, and HeadNorth.

 

[Jeannine]

A Treatment for ALS? Neural stem cell transplants slow progression of disease

A Treatment for ALS?
Neural stem cell transplants slow progression of disease
January 2, 2013

http://hms.harvard.edu/content/treatment-als

Results from a meta-analysis of 11 independent amyotrophic lateral sclerosis research studies are giving hope to the ALS community by showing, for the first time, that the fatal disease may be treatable.

Researchers say progress in treating ALS, also known as Lou Gehrig’s disease, may be made by targeting new mechanisms revealed by neural stem cell-based studies.

“This significant research will help us better understand the mechanisms underlying motor neuron diseases,” said Yang (Ted) Teng, HMS associate professor of surgery at Brigham and Women's Hospital and one of the study's co-lead authors. Teng is also director of the Spinal Cord Injury and Stem Cell Biology Research Laboratory in the Department of Neurosurgery at Brigham and Women’s.

The research studies were conducted at Brigham and Women’s, Boston Children’s Hospital, Sanford-Burnham Medical Research Institute, UMass Medical School, Johns Hopkins University, SUNY-Syracuse, Columbia University and the VA Boston Healthcare System.

ALS causes nerve cells in the spinal cord to die, eventually taking away a person's ability to move or even breathe. A decade of research conducted at multiple institutions shows, however, that when neural stem cells were transplanted into multilevels of the spinal cord of a mouse model with familial ALS, disease onset and progression slowed, motor and breathing function improved and treated mice survived three to four times longer than untreated mice.

A summary of the findings from all 11 studies was published online in December in Science Translational Medicine.

The transplanted neural stem cells help by producing factors that preserve the health and function of the host's remaining nerve cells. They also reduce inflammation and suppress the number of disease causing cells in the host's spinal cord.

“This work sheds new light on detrimental roles played by non-neuronal cells in triggering motor neuron death, and these events should be targeted for developing more effective therapeutics to treat ALS,” Teng said.

The transplanted neural stem cells benefited the mice with ALS by boosting the health and function of their remaining nerve cells. The neural stem cells also reduced inflammation and suppressed the number of disease-causing cells in their spinal cords. The neural stem cells did not replace deteriorating nerve cells. Researchers observed improved motor performance and respiratory function in the treated mice. The neural stem cell transplant also slowed the disease's progression. Twenty-five percent of the treated ALS mice in the study survived for one year or more—roughly three to four times longer than untreated mice.

“This is not a cure for ALS,” said Teng, who is one of the principal investigators of Project ALS’ consortium project. “But it shows the potential that mechanisms used by neural stem cells in our study have for improving an ALS patient’s quality of life and length of life.”

Neural stem cells are the precursors of all brain cells. They can self-renew, making more neural stem cells, and differentiate, becoming nerve cells or other brain cells. The cells can also rescue malfunctioning nerve cells and help preserve and regenerate host brain tissue.

The transplanted neural stem cells helped the ALS mice, but not for the obvious reason that they replaced nerve cells missing in the ALS spinal cord. The biggest impact actually came from a series of other beneficial neural stem cell activities. It turns out neural stem cells produce protective molecules. They also trigger host cells to produce their own protective molecules. In turn, these factors help spare host nerve cells from further destruction.

A number of other positive events then take place in treated mice. The transplanted normal neural stem cells change the fate of the host’s own diseased neural stem cells for the better. This change decreases the number of toxin producing, disease promoting cells in the host’s spinal cord. Transplanted neural stem cells also reduce inflammation.

Researchers discovered that cell replacement played a surprisingly small role in the impressive clinical benefits. Rather, the stem cells changed the host environment for the better and protected the endangered nerve cells.

The research studies were primarily funded by Project ALS, the California Institute for Regenerative Medicine, the National Institute of Neurological Disorders and Stroke, the Christopher Reeve Foundation/American Paralysis Association, the Sanford Children’s Research Center, the A-T Children’s Project and the Zinberg Foundation.

Additional support to Teng was provided by a VA Biomedical Research and Development Grant, a VA Rehabilitation Research and Development Grant, and an NIH R21 grant.