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Timing and dose regimens of marrow mesenchymal stem cell transplantation affect the outcomes and neuroinflammatory response after ischemic stroke.

ABSTRACT: AIMS:Intravenous transplantation of bone marrow mesenchymal stem cells (BMSCs) had been documented to improve functional outcome after ischemic stroke. However, the timing and appropriate cell number of transplantation to achieve better outcome after an episode of stroke remain further to be optimized. METHODS:To determine the optimal conditions, we transplanted different concentrations of BMSCs at different time points in a rat model of ischemic stroke. Infarction volume and neurological behavioral tests were performed after ischemia. RESULTS:We found that transplantation of BMSCs at 3 and 24 h, but not 7 days after focal ischemia, significantly reduced the lesion volume and improved motor deficits. We also found that transplanted cells at 1 × 10(6) to 10(7) , but not at 1 × 10(4) to 10(5) , significantly improved functional outcome after stroke. In addition to inhibiting macrophages/microglia activation in the ischemic brain, BMSC transplantation profoundly reduced infiltration of gamma delta T (??T) cells, which are detrimental to the ischemic brain, and significantly increased regulatory T cells (Tregs), along with altered Treg-associated cytokines in the ischemic brain. CONCLUSIONS:Our data suggest that timing and cell dose of transplantation determine the therapeutic effects after focal ischemia by modulating poststroke neuroinflammation.

SUBMITTER: Wang LQ

PROVIDER: S-EPMC6493061 | biostudies-literature | 2014 Apr

REPOSITORIES: biostudies-literature

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Timing and dose regimens of marrow mesenchymal stem cell transplantation affect the outcomes and neuroinflammatory response after ischemic stroke.

Wang Liu-Qing LQ Lin Zhen-Zhen ZZ Zhang Hong-Xia HX Shao Bei B Xiao Li L Jiang Hui-Gang HG Zhuge Qi-Chuan QC Xie Luo-Kun LK Wang Brian B Su Dong-Ming DM Jin Kun-Lin KL

CNS neuroscience & therapeutics 20140107 4

<h4>Aims</h4>Intravenous transplantation of bone marrow mesenchymal stem cells (BMSCs) had been documented to improve functional outcome after ischemic stroke. However, the timing and appropriate cell number of transplantation to achieve better outcome after an episode of stroke remain further to be optimized.<h4>Methods</h4>To determine the optimal conditions, we transplanted different concentrations of BMSCs at different time points in a rat model of ischemic stroke. Infarction volume and neur ...[more]

PMID: 24393245

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Project description:BackgroundIschemic stroke provokes a neuroinflammatory response and simultaneously promotes release of epinephrine and norepinephrine by the sympathetic nervous system. This increased sympathetic outflow can act on β2-adrenergic receptors expressed by immune cells such as brain-resident microglia and monocyte-derived macrophages (MDMs), but the effect on post-stroke neuroinflammation is unknown. Thus, we investigated how changes in β2-adrenergic signaling after stroke onset influence the microglia/MDM stroke response, and the specific importance of microglia/MDM β2-adrenergic receptors to post-stroke neuroinflammation.MethodsTo investigate the effects of β2-adrenergic receptor manipulation on post-stroke neuroinflammation, we administered the β2-adrenergic receptor agonist clenbuterol to mice 3 h after the onset of photothrombotic stroke. We immunostained to quantify microglia/MDM numbers and proliferation and to assess morphology and activation 3 days later. We assessed stroke outcomes by measuring infarct volume and functional motor recovery and analyzed gene expression levels of neuroinflammatory molecules. Finally, we evaluated changes in cytokine expression and microglia/MDM response in brains of mice with selective knockout of the β2-adrenergic receptor from microglia and monocyte-lineage cells.ResultsWe report that clenbuterol treatment after stroke onset causes enlarged microglia/MDMs and impairs their proliferation, resulting in reduced numbers of these cells in the peri-infarct cortex by 1.7-fold at 3 days after stroke. These changes in microglia/MDMs were associated with increased infarct volume in clenbuterol-treated animals. In mice that had the β2-adrenergic receptor specifically knocked out of microglia/MDMs, there was no change in morphology or numbers of these cells after stroke. However, knockdown of β2-adrenergic receptors in microglia and MDMs resulted in increased expression of TNFα and IL-10 in peri-infarct tissue, while stimulation of β2-adrenergic receptors with clenbuterol had the opposite effect, suppressing TNFα and IL-10 expression.ConclusionsWe identified β2-adrenergic receptor signaling as an important regulator of the neuroimmune response after ischemic stroke. Increased β2-adrenergic signaling after stroke onset generally suppressed the microglia/MDM response, reducing upregulation of both pro- and anti-inflammatory cytokines, and increasing stroke size. In contrast, diminished β2-adrenergic signaling in microglia/MDMs augmented both pro- and anti-inflammatory cytokine expression after stroke. The β2-adrenergic receptor may therefore present a therapeutic target for improving the post-stroke neuroinflammatory and repair process.

Dataset Information

Timing and dose regimens of marrow mesenchymal stem cell transplantation affect the outcomes and neuroinflammatory response after ischemic stroke.

Publications

Timing and dose regimens of marrow mesenchymal stem cell transplantation affect the outcomes and neuroinflammatory response after ischemic stroke.

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