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Hope for treating spinal injuries

22 September 2008
Appeared in BioNews 476

Researchers have generated a specialised type of nerve cell - astrocytes - from embryonic stem cell (ES cells). The astrocytes were used to treat spinal injury in rats, with impressive results, restoring their ability to move freely. The team of scientists from the University of Rochester, New York, and the University of Colorado, Denver, US, published the work last week in the online Journal of Biology.

The researchers developed a system to generate astrocytes from ES cells and found that two different types could be grown, by using different conditions to nurture the stem cells. Astrocytes are nerve cells that have a star-like shape, and account for 70 per cent of all cells in the central nervous system. They play numerous roles in maintaining the structure, metabolism and function of the brain and spinal cord.

When transplanted into spinal injury sites in rats, the two types of astrocyte had completely different effects. One promoted the regeneration of nerve cells, and limb movement was recovered within four weeks. The other type failed to promote nerve fibre regeneration or recovery of movement and, in addition, caused severe pain.

Controlling the development of stem cells immediately before transplanting them into injured spinal cords is essential. This is because the injured tissues of the body cannot be relied on to create the right types of cells from stem cells. This is illustrated by the fact that when the researchers implanted the stem cells (before they were astrocytes), they failed to promote nerve regeneration and caused pain. The researchers say this is a breakthrough that will change the way spinal cord injuries are treated with stem cells.

'It has long been a concern that therapies that promote growth of nerve fibres in the injured spinal cord would also cause sprouting in pain circuits', said Dr Stephen Davies, from the University of Denver. He added: 'However by using the right astrocytes to repair spinal cord injuries we can have all the gains without the pain, while these other cell types appear to provide the opposite - pain but no gain'.

The team is working on extending its research to human cells. Dr Davies told the Telegraph newspaper: 'We hope to translate this promising new cell replacement therapy to clinical trials within the next two to three years if all goes well'.

Key Advance In Treating Spinal Cord Injuries Found In Manipulating Stem Cells
ScienceDaily |  18 September 2008
Special nerve cells could be key to treating spinal injuries
The Daily Telegraph |  18 September 2008
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A US company has launched an experimental neural stem cell clinical trial for patients paralysed by spinal injury. StemCells Inc will extract neural stem cells from donated aborted fetuses to be injected into the spines of patients with chest-level spinal cord injury...
18 October 2010 - by Dr Lux Fatimathas 
A patient paralysed through spinal cord injury has become the first person to receive human embryonic stem (ES) cell treatment in a clinical trial being conducted in the United States...
23 August 2010 - by Kyrillos Georgiadis 
Japanese researchers have overcome a major obstacle to treating severe spinal cord injuries using stem cells taken from the brain...
30 March 2006 - by BioNews 
Canadian researchers have used a cocktail of stem cells, growth hormones and anti-inflammatory drugs to treat rats with spinal injuries. The team, based at the Toronto Western Research Institute, say that the treatment restored some walking ability and limb control in the animals. The research, published in the Journal of...
2 December 2005 - by BioNews 
Professor Geoffrey Raisman, chairman of a committee on neurological regeneration at the Institute of Neurology and director of the Spinal Repair Unit, both at University College London, has announced the first British attempt to treat paralysed spinal cord injury patients with their own stem cells. His method involves taking cells...
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US scientists have used nerve stem cells to treat mice affected by severe spinal cord injuries. The team, based at the University of California at Irvine, said the treated animals regained the ability to walk just a few weeks after receiving the injections. The findings, published in the Proceedings of...
4 July 2003 - by BioNews 
Two new studies carried out using rats have shown that stem cells taken from early embryos could be used to treat spinal injuries. Researchers at the University of California in Irvine, US, used stem cells from human embryos to grow specialised 'nerve insulating' cells to successfully treat paralysed rats with...
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A team of researchers at Washington University School of Medicine, St Louis, has grown nerve cells in the laboratory and used them to repair damaged adult rat spinal cords. The scientists used embryo stem cells - cells that can grow into any type of body tissue - to obtain a supply of...
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