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http://dx.doi.org/10.5352/JLS.2006.16.3.464

Effect of Exercise on Neurotrophins, BDNF, NT-3, GAP43 Protein Expression and Axonal Regeneration after Sciatic Nerve Injury in F344 Rats  

Yoon Jin-Hwan (Department of Sports and Leisure Studies, Hannam University)
Seo Tae-Beom (Department of Sports and Leisure Studies, Hannam University)
Publication Information
Journal of Life Science / v.16, no.3, 2006 , pp. 464-471 More about this Journal
Abstract
Peripheral nerve injuries are a commonly encountered clinical problem and often result in severe functional deficits. In the present study, the effects of treadmill exercise on neurotrophin expressions and functional recovery following sciatic crushed nerve injury were investigated. Animals were randomly assigned into four groups: the sciatic nerve injury group, the sciatic nerve injury and 3-day-exercise, the sciatic nerve injury and 7-days-exercise, and the sciatic nerve injury and 14-days-exercise groups. Sciatic nerve injury was caused by crushing the right sciatic nerve for 30 s using a surgical clip. A the light-exercise was applied to each of the exercise group over the respective number of days. In the present results, we identified enhanced axonal re-growth in the distal stump of the sciatic nerve 3-14 days after crush injury with treadmill training. Dorsal root ganglion (DRG) neuron when cultured from animals with nerve injury and treadmill training showed more enhanced neurite outgrowth than that of sedentary animals. Nerve growth factor (NGF) protein levels in low-intensity treadmill training group were highly induced in the injured sciatic nerves 3, 7 and 14 days after injury compared with sedentary group, and brain-derived neurotrophin factor (BDNF) protein levels in treadmill exercise group were highly induced in the injured sciatic nerve 3 days after injury compared with sedentary group. Then, treadmill exercise increased neurotrophic factors induced in the regenerating nerves. We further demonstrate that motor functional recovery after sciatic nerve injury was promoted by treadmill exercise. Thus, the present data provide a new evidence that treadmill exercise enhanced neurotrophins expression and axonal regeneration after sciatic nerve injury in rats.
Keywords
Treadmill exercise; neurotrophic factors; sciatic nerve injury; axonal regeneration;
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