Published online before print February 26, 2004, doi: 10.1161/01.STR.0000119754.85848.0D
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(Stroke. 2004;35:992.)
© 2004 American Heart Association, Inc.
Original Contributions |
Effect of Brain-Derived Neurotrophic Factor Treatment and Forced Arm Use on Functional Motor Recovery After Small Cortical Ischemia
From the Departments of Neurology (W.-R.S., C.B., R.K., M.S., E.T., S.S.) and Neuropathology (E.T., M.K.), University of Heidelberg, Heidelberg, and Division of Neuropathology, University of Ulm, Ulm (C.S.), Germany.
Correspondence to Wolf-Rüdiger Schäbitz, MD, Department of Neurology, University of Heidelberg, INF 400, 69120 Heidelberg, Germany. E-mail wolf_schaebitz{at}med.uni-heidelberg.de
Background and Purpose— Both the administration of growth factors and physical therapy such as forced arm use (FAU) are promising approaches to enhance recovery after stroke. We explored the effects of these therapies on behavioral recovery and molecular markers of regeneration after experimental ischemia.
Methods— Rats were subjected to photothrombotic ischemia: sham (no ischemia), control (ischemia), brain-derived neurotrophic factor (BDNF; ischemia plus BDNF, 20 µg), and FAU (ischemia plus FAU, 1-sleeve plaster cast ipsilateral limb). Animals survived 1 or 6 weeks and underwent behavioral testing (Rotarod, beam balance, adhesive removal, plantar test, neuroscore). After the rats were killed, brain sections were immunostained for semiquantitative analysis of MAP1B, MAP2, synaptophysin, GFAP expression, and quantification of infarct volumes.
Results— Infarct volumes were not different between the groups 1 or 6 weeks after ischemia. BDNF-treated animals had better functional motor recovery (Rotarod, beam balance, neuroscore) compared with all other groups (P<0.05). There was no significant adverse effect of early FAU treatment on motor recovery, although sensorimotor function (adhesive removal test) was impaired (P<0.05). There were no differences between groups as measured by nociception of the left and right forepaw (plantar test). BDNF treatment transiently induced MAP1B expression in the ischemic border zone and synaptophysin expression within the contralateral cortex 6 weeks after ischemia (P<0.05). Both BDNF and FAU reduced astrogliosis compared with controls (P<0.05).
Conclusions— Postischemic intravenous BDNF treatment improves functional motor recovery after photothrombotic stroke and induces widespread neuronal remodeling. Early FAU treatment after stroke does not increase infarct size, impairs sensorimotor function, but leaves motor function unchanged. Postischemic astrogliosis was reduced by both treatments.
Key Words: brain-derived neurotrophic factor • cerebral ischemia • forced arm use • photothrombosis • regeneration
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