Cited by 115Stroke Rehabilitation and RecoverySpinal Cord Injury ResearchTranscranial Magnetic Stimulation Studies

Contralesional axonal remodeling of the corticospinal system in adult rats after stroke and bone marrow stromal cell treatment

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Liu, Zhongwu, Li, Yi, Zhang, Xueguo, Savant-Bhonsale, Smita, Chopp, Michael·2008·Stroke

Abstract

Background and Purpose— Motor recovery after stroke is associated with neuronal reorganization in bilateral hemispheres. We investigated contralesional corticospinal tract remodeling in the brain and spinal cord in rats after stroke and treatment of bone marrow stromal cells. Methods— Adult male Wistar rats were subjected to permanent right middle cerebral artery occlusion. Phosphate-buffered saline or bone marrow stromal cells were injected into a tail vein 1 day postischemia. An adhesive removal test was performed weekly to monitor functional recovery. Threshold currents of intracortical microstimulation on the left motor cortex for evoking bilateral forelimb movements were measured 6 weeks after stroke. When intracortical microstimulation was completed, biotinylated dextran amine was injected into the left motor cortex to anterogradely label the corticospinal tract. At 4 days before euthanization, pseudorabies virus-152-EGFP and 614-mRFP were injected into left or right forelimb extensor muscles, respectively. All animals were euthanized 8 weeks after stroke. Results— In normal rats (n=5), the corticospinal tract showed a unilateral innervation pattern. In middle cerebral artery occlusion rats (n=8), our data demonstrated that: 1) stroke reduced the stimulation threshold evoking ipsilateral forelimb movement; 2) EGFP-positive pyramidal neurons were increased in the left intact cortex, which were labeled from the left stroke-impaired forelimb; and 3) biotinylated dextran amine-labeled contralesional axons sprouted into the denervated spinal cord. Bone marrow stromal cells significantly enhanced all 3 responses (n=8, P <0.05). Conclusions— Our data demonstrated that corticospinal tract fibers originating from the contralesional motor cortex sprout into the denervated spinal cord after stroke and bone marrow stromal cells treatment, which may contribute to functional recovery.

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Authors
Liu, Z., Li, Y., Zhang, X., Savant-Bhonsale, S., & Chopp, M.
Affiliations
  • Oakland University (US)
  • From the Department of Neurology (Z.L., Y.L., X.Z., M.C.), Henry Ford Hospital, Detroit, Mich; the Department of Physics (M.C.), Oakland University, Rochester, Mich; and Theradigm, Inc (S.S.-B.), Baltimore, Md.
Venue
Stroke
Published
2008-09
Volume
39
Issue
9
Pages
2571-2577
ISSN
  • 0039-2499 (ISSN-L)
  • 1524-4628
OpenAlex
W2136193279
Cited by
115
References
41
Citations by year
2026: 2 · 2025: 3 · 2024: 3 · 2023: 2 · 2022: 2 · 2021: 5 · 2020: 6 · 2019: 8 · 2018: 4 · 2017: 9 · 2016: 10 · 2015: 5 · 2014: 14 · 2013: 9 · 2012: 13
FWCI
7.12
Type
journal article
Language
en
Open access
Locations
  • Stroke (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Princeton University
  • National Institute of Neurological Disorders and Stroke (P01NS42345, P01NS042345)
Topics
  • Health Sciences › Medicine › Rehabilitation › Stroke Rehabilitation and Recovery
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Spinal Cord Injury Research
  • Life Sciences › Neuroscience › Neurology › Transcranial Magnetic Stimulation Studies
Keywords
corticospinal tract, mesenchymal stem cells, motor recovery, middle cerebral artery occlusion, intracortical microstimulation, pseudorabies virus tracing, axonal remodeling
MeSH terms
Animals, Axonal Transport, Biotin, Brain Mapping, Dextrans, Disease Models, Animal, Electric Stimulation, Fluorescent Antibody Technique, Functional Laterality, Male, Motor Cortex, Nerve Regeneration, Neuronal Plasticity, Herpesvirus 1, Suid, Pyramidal Tracts, Bone Marrow Transplantation, Stromal Cells, Rats, Wistar, Muscle, Skeletal, Recovery of Function, Infarction, Middle Cerebral Artery, Brain Infarction, Stroke, Rats

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