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Bone marrow stromal cells promote skilled motor recovery and enhance contralesional axonal connections after ischemic stroke in adult mice.

ABSTRACT: We tested the effect of bone marrow stromal cells (BMSCs) on neuronal remodeling of the corticospinal tract originating from the contralesional cortex in mice subjected to unilateral pyramidotomy (PT) followed by middle cerebral artery occlusion (MCAO).Adult mice with transgenic yellow fluorescent protein labeling in the corticospinal tract were subjected to right hemispheric PT and right permanent or sham MCAO. One day later, the mice were treated intravenously with BMSCs or phosphate-buffered saline. A Foot-Fault test and a single pellet-reaching test were performed before surgery, 3 days after MCAO, and weekly thereafter. Pseudorabies virus-614-monomeric red fluorescent protein was injected into the left forelimb flexor muscles 28 days after surgery (4 days before euthanasia). The brain and cervical cord were processed for fluorescent microscopy to detect red fluorescent protein and yellow fluorescent protein labeling, respectively.Significant functional improvements were evident in PT-MCAO mice treated with BMSCs (n=9) compared with phosphate-buffered saline-treated mice (n=9, P<0.05), but not in mice with PT-sham MCAO treated with either phosphate-buffered saline (n=9) or BMSCs (n=10). Furthermore, in PT-MCAO mice, both corticospinal tract axonal density in the denervated side of the cervical gray matter and red fluorescent protein-labeled pyramidal neurons in the left intact cortex were significantly increased compared with PT-sham MCAO mice (P<0.05). BMSCs significantly enhanced both corticospinal tract density and red fluorescent protein labeling in PT-MCAO mice (P<0.05) only. The behavioral outcome was highly correlated with corticospinal tract density and red fluorescent protein labeling.BMSCs amplify stroke-induced contralesional neuronal remodeling, which contributes to motor recovery after stroke.

SUBMITTER: Liu Z

PROVIDER: S-EPMC3060040 | biostudies-literature | 2011 Mar

REPOSITORIES: biostudies-literature

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Bone marrow stromal cells promote skilled motor recovery and enhance contralesional axonal connections after ischemic stroke in adult mice.

Liu Zhongwu Z Li Yi Y Zhang Rui Lan RL Cui Yisheng Y Chopp Michael M

Stroke 20110209 3

<h4>Background and purpose</h4>We tested the effect of bone marrow stromal cells (BMSCs) on neuronal remodeling of the corticospinal tract originating from the contralesional cortex in mice subjected to unilateral pyramidotomy (PT) followed by middle cerebral artery occlusion (MCAO).<h4>Methods</h4>Adult mice with transgenic yellow fluorescent protein labeling in the corticospinal tract were subjected to right hemispheric PT and right permanent or sham MCAO. One day later, the mice were treated ...[more]

PMID: 21307396

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Project description:BackgroundStroke is a leading cause of death and disability worldwide, yet there are limited treatments available. Intranasal administration is a novel non-invasive strategy to deliver cell therapy into the brain. Cells delivered via the intranasal route can migrate from the nasal mucosa to the ischemic infarct and show acute neuroprotection as well as functional benefits. However, there is little information about the regenerative effects of this transplantation method in the delayed phase of stroke. We hypothesized that repeated intranasal deliveries of bone marrow stromal cells (BMSCs) would be feasible and could enhance delayed neurovascular repair and functional recovery after ischemic stroke.ResultsReverse transcription polymerase chain reaction and immunocytochemistry were performed to analyze the expression of regenerative factors including SDF-1α, CXCR4, VEGF and FAK in BMSCs. Ischemic stroke targeting the somatosensory cortex was induced in adult C57BL/6 mice by permanently occluding the right middle cerebral artery and temporarily occluding both common carotid arteries. Hypoxic preconditioned (HP) BMSCs (HP-BMSCs) with increased expression of surviving factors HIF-1α and Bcl-xl (1 × 106 cells/100 μl per mouse) or cell media were administered intranasally at 3, 4, 5, and 6 days after stroke. Mice received daily BrdU (50 mg/kg) injections until sacrifice. BMSCs were prelabeled with Hoechst 33342 and detected within the peri-infarct area 6 and 24 h after transplantation. In immunohistochemical staining, significant increases in NeuN/BrdU and Glut-1/BrdU double positive cells were seen in stroke mice received HP-BMSCs compared to those received regular BMSCs. HP-BMSC transplantation significantly increased local cerebral blood flow and improved performance in the adhesive removal test.ConclusionsThis study suggests that delayed and repeated intranasal deliveries of HP-treated BMSCs is an effective treatment to encourage regeneration after stroke.

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Bone marrow stromal cells promote skilled motor recovery and enhance contralesional axonal connections after ischemic stroke in adult mice.

Publications

Bone marrow stromal cells promote skilled motor recovery and enhance contralesional axonal connections after ischemic stroke in adult mice.

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