The ability of the brain to recover from such injury as stroke or trauma depends on a particular circuitry of neurons that "talk" to one another using the brain chemical acetylcholine, researchers led by James Conner and Mark Tuszynski in the Neural repair Group at UCSD have discovered. Their finding in rats could help enhance rehabilitation to recover from such injuries by leading to the development of drugs or other treatments to enhance the "cholinergic system."

The researchers said that their finding that the cholinergic system is involved in brain recovery is particularly intriguing in light of the fact that deficits in the system have been associated with aging, Alzheimer's disease, and traumatic brain injury.

Researchers have long believed that rehabilitation from brain injury causes a rewiring, or plasticity, of brain circuitry--called a "reorganization of cortical motor representations"--to reestablish connections that control muscles. However, the specific type of brain circuitry on which this plasticity depended was not known.

Conner and his colleagues were guided in their experiments by earlier studies showing that the cholinergic system in a region called the basal forebrain was associated with normal learning of motor control.

To determine whether this same system also played a role in rehabilitation from brain injury, they first taught rats to reach for food pellets with their forepaws. In one group of animals, they then used a toxin to specifically eliminate cholinergic nerves connecting to the motor and sensory regions of the animals' cortex. The other control group received a sham injection. The researchers then used electrical probes to create small lesions in the rats' brain region responsible for controlling limb movement.

They then gave the rats rehabilitation training. The control group of rats recovered about 55% of the deficit in their reaching ability, while the rats lacking a cholinergic system recov
'"/>

Contact: Heidi Hardman
hhardman@cell.com
1-617-397-2879
Cell Press
20-Apr-2005

Page: 1 2
Related biology news :

1. Pediatric center to offer novel rehabilitation approach for spinal cord injury
2. Bacteria for better ice cream and artificial snow no longer depends on trek to poles
3. Persistence of HPV infection depends on a patients race
4. Preventing ventilation induced lung injury depends on giving the right number of sighs
5. Cell survival depends on chromosome integrity
6. Difference in talking louder, talking over noise depends on verbal cues, internal targets
7. Fats fate depends on its source
8. Experience sculpts brain circuitry to build resiliency to stress
9. UT Southwestern researchers find alterations in brains circuitry caused by cocaine
10. New study to explore cellular circuitry
11. Nicotine triggers the same brain reward circuitry as opiates