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They suffer many complications in addition to paralysis and numbness and some of these problems are caused by a lack of the neurotransmitter GABA in the injured spinal cord.

A new University of California, San Francisco study in mice found human embryonic stem cells reduced two of the most severe side effects - incontinence and pain sensitivity.

Co-first author Assistant Professor Dr Cory Nicholas said: Chronic pain and bladder dysfunction remain significant quality-of-life issues for many people with spinal cord injuries.

Inhibitory cell-based neuro-therapy is a new approach and has shown promise to date in early animal studies, warranting further development."

The stem cell treatment differentiated into medial ganglionic eminence (MGE)-like cells, which produce GABA (gamma-Aminobutyric acid), an inhibitory neurotransmitter that is found throughout the central nervous system.

Our hope is that this treatment would last a long time, or maybe even be permanent

Dr Thomas Fandel

It plays an important role in reducing the excitability of neurons by binding to receptors that act on synapses.

Neuropathic pain and bladder dysfunction are at least in part attributed to overactive spinal cord circuits.

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Senior author Professor Dr Arnold Kriegstein said: We reasoned if we could take inhibitory neurons and directly place them into the spinal cord in the regions that are overactive, they might integrate into those circuits and suppress the activity.

In the study researchers used GABAergic inhibitory neuron precursors called MGE-like cells that were derived from human embryonic stem cells.

The neural precursor cells were placed into the spinal cords of mice two weeks after injury had been induced, where they could differentiate into GABA-producing neuron subtypes and form synaptic connections.

Co-author Dr Thomas Fandel, a research specialist at UCSF added: Rather than implanting these cells into the site of injury, at the mid-thoracic level, we injected them in the lumbosacral region, where the circuits are known to be overactive.

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Six months later we could see broad dispersion of the cells in that area. They were integrated into the spinal cord.

Tests showed the mice were not incontinent and had significantly reduced pain sensitivities.

Current treatments for neuropathic pain in people with spinal cord injuries most often involve opioids and other pain medications, as well as certain antidepressants, which have many side effects and tend to have limited efficacy.

Treatments for bladder dysfunction are often anticholinergics, but these drugs have side effects like dizziness and dry mouth.

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Botox may help with bladder spasms, but the benefits tend to be transient.

Dr Fandel added: The current approaches for treatment are not very effective and clearly more options are needed.

Our hope is that this treatment would last a long time, or maybe even be permanent.

The study was published in the journal Cell Stem Cell.

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Human stem cells could provide relief for spinal cord ...