Intravenous transplantation of mesenchymal stem (stromal) cells (MSC) is a promising approach to the treatment of ischemic stroke. In the published reports of the already completed preclinical and clinical studies the dosages of transplanted MSC greatly vary. However, the optimal dosage has not been determined. The dose-dependent effect of intravenous MSC transplantation was studied, in rats with experimental cerebral infarction. To this end, 5×10 and 2×10 MSC were intravenously administered 24 h after modeling of acute focal ischemia followed by complex assessment of the therapeutic efficacy over 60 days. The rate and degree of the recovery of neurological functions in rats increased with increasing the dose of injected cells, which confirms the dose-dependent effect of intravenous MSC transplantation.
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