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Updated: May 8, 2026
High Throughput Characterization of Adult Stem Cells Engineered for Delivery of Therapeutic Factors for Neuroprotective Strategies
Published on: January 4, 2015
Human Amnion-Derived Mesenchymal Stromal Cell Exosomes Promote Neuroprotection and Neurovascular Remodeling after
Shiro Takahashi1, Chikako Nito1,2, Yuki Sakamoto1
1Department of Neurological Science, Graduate School of Medicine, Nippon Medical School.
Background:
Ischemic stroke remains a leading cause of death and long-term disability worldwide, and effective neuroprotective therapies applicable to a broad patient population are still limited. Although mesenchymal stromal cell-derived exosomes (MSC-EXO) have emerged as promising cell-free therapeutic agents, evidence regarding exosomes derived from human amnion-derived mesenchymal stromal cells (AMSC-EXO) in cerebral ischemia remains scarce.
Methods:
Human AMSC-EXO were isolated from conditioned media of cultured human amnion-derived mesenchymal stromal cells and characterized by nanoparticle tracking analysis and exosomal marker expression. Male mice were subjected to middle cerebral artery occlusion and randomly assigned to receive intravenous AMSC-EXO or vehicle 24 h after ischemia. Neurological function, motor coordination, and spatial working memory were assessed at 3 and 14 days. Post-ischemic neuroinflammation, neuronal degeneration, and endothelial cell proliferation were evaluated by immunohistochemistry and enzyme-linked immunosorbent assay in a blinded manner.
Results:
Systemic administration of AMSC-EXO significantly improved neurological outcomes and motor performance after cerebral ischemia and enhanced spatial working memory. AMSC-EXO treatment markedly suppressed microglial activation and reduced the expression of pro-inflammatory cytokines, including tumor necrosis factor-α, interleukin-1β, and interleukin-6, in the ischemic brain. In addition, neuronal degeneration in the cortical infarct border zone was significantly attenuated. At later stages, AMSC-EXO significantly increased the number of proliferating endothelial cells, suggesting a potential involvement in neurovascular remodeling.
Conclusion:
Human AMSC-derived exosomes exert neuroprotective and neurovascular restorative effects after cerebral ischemia by suppressing post-ischemic neuroinflammation, reducing neuronal cell death, and promoting endothelial cell proliferation. AMSC-EXO represents a promising, scalable, and cell-free therapeutic strategy for ischemic stroke.
