Abstract
Transplantation of bone marrow stromal cells (BMSCs) is a promising therapy for ischemic stroke, but the poor oxygen environment in brain lesions limits the efficacy of cell-based therapies. Here, we tested whether hypoxic preconditioning (HP) could augment the efficacy of BMSC transplantation in a rat ischemic stroke model and investigated the underlying mechanism of the effect of HP. In vitro, BMSCs were divided into five passage (P0, P1, P2, P3, and P4) groups, and HP was applied to the groups by incubating the cells with 1% oxygen for 0, 4, 8, 12, and 24 h, respectively. We demonstrated that the expression of hypoxia-inducible factor-1α (HIF-1α) was increased in the HP-treated BMSCs, while their viability was unchanged. We also found that HP decreased the apoptosis of BMSCs during subsequent simulated ischemia–reperfusion (I/R) injury, especially in the 8-h HP group. In vivo, a rat transient focal cerebral ischemia model was established. These rats were administered normal cultured BMSCs (N-BMSCs), HP-treated BMSCs (H-BMSCs), or DMEM cell culture medium (control) at 24 h after the ischemic insult. Compared with the DMEM control group, the two BMSC-transplanted groups exhibited significantly improved functional recovery and reduced infarct volume, especially the H-BMSC group. Moreover, HP decreased neuronal apoptosis and enhanced the expression of BDNF and VEGF in the ischemic brain. Survival and differentiation of transplanted BMSCs were also increased by HP, and the quantity of engrafted BMSCs was significantly correlated with neurological function improvement. These results suggest that HP may enhance the therapeutic efficacy of BMSCs in an ischemic stroke model. The underlying mechanism likely involves the inhibition of caspase-3 activation and an increasing expression of HIF-1α, which promotes angiogenesis and neurogenesis and thereby reduces neuronal death and improves neurological function.
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This work was supported by the Chinese Natural Science Foundation (Grants 81000497 and 81471257) and Natural Science Foundation of Jiangsu Province of China (Grant BK20161283), and sponsored by Qing Lan Project (to G.W). The funders had no role in the study design, the data collection and analysis, the decision to publish, or the preparation of the manuscript.
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Jin Chen and Yuanyuan Yang have contributed equally to this work.
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10571_2016_445_MOESM1_ESM.tif
Fig. S1. Confocal microscopy detected that HP promote the increase of BrdU-positive cells expressing nestin. Double immunofluorescence staining for engrafted BMSCs (BrdU-positive cells, red) and Nestin (green)-positive cells in the ischemic brain at day 7 after occlusion. Scale bar 250 μm. (TIFF 3697 kb)
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Chen, J., Yang, Y., Shen, L. et al. Hypoxic Preconditioning Augments the Therapeutic Efficacy of Bone Marrow Stromal Cells in a Rat Ischemic Stroke Model. Cell Mol Neurobiol 37, 1115–1129 (2017). https://doi.org/10.1007/s10571-016-0445-1
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DOI: https://doi.org/10.1007/s10571-016-0445-1