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Stroke damage in mice overcome by training that 'rewires' brain centers
Date:2/5/2013

Johns Hopkins researchers have found that mice can recover from physically debilitating strokes that damage the primary motor cortex, the region of the brain that controls most movement in the body, if the rodents are quickly subjected to physical conditioning that rapidly "rewires" a different part of the brain to take over lost function.

Their research, featuring precise, intense and early treatment, and tantalizing clues to the role of a specific brain area in stroke recovery, is described online in the journal Stroke.

"Despite all of our approved therapies, stroke patients still have a high likelihood of ending up with deficits," says study leader Steven R. Zeiler, M.D., Ph.D., an assistant professor of neurology at the Johns Hopkins University School of Medicine. "This research allows us the opportunity to test meaningful training and pharmacological ways to encourage recovery of function, and should impact the care of patients."

With improved acute care for stroke, more patients are surviving. Still, as many as 60 percent are left with diminished use of an arm or leg, and one-third need placement in a long-term care facility. The economic cost of disability translates to more than $30 billion in annual care.

For their study, the researchers first trained normal but hungry mice to reach for and grab pellets of food in a precise way that avoided spilling the pellets and gave them the pellets as a reward. The task was difficult to master, the researchers say, but the mice reached maximum accuracy after seven to nine training days.

Then the researchers created experimental small strokes that left the mice with damage to the primary motor cortex. Predictably, the reaching and grasping precision disappeared, but a week of retraining, begun just 48 hours after the stroke, led the mice to again successfully perform the task with a degree of precision comparable to before the stroke.

Subsequent brain st
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Contact: Stephanie Desmon
sdesmon1@jhmi.edu
410-955-8665
Johns Hopkins Medicine
Source:Eurekalert

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