Transplanted bone marrow stromal cells improves cognitive dysfunction due to diffuse axonal injury in rats
Katsuhiko Maruichi
Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
Search for more papers by this authorSatoshi Kuroda
Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
Search for more papers by this authorYasuhiro Chiba
Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
Search for more papers by this authorMasaaki Hokari
Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
Search for more papers by this authorHideo Shichinohe
Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
Search for more papers by this authorKazutoshi Hida
Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
Search for more papers by this authorYoshinobu Iwasaki
Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
Search for more papers by this authorKatsuhiko Maruichi
Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
Search for more papers by this authorSatoshi Kuroda
Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
Search for more papers by this authorYasuhiro Chiba
Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
Search for more papers by this authorMasaaki Hokari
Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
Search for more papers by this authorHideo Shichinohe
Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
Search for more papers by this authorKazutoshi Hida
Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
Search for more papers by this authorYoshinobu Iwasaki
Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
Search for more papers by this authorAbstract
Diffuse axonal injury (DAI) often leads to persistent cognitive dysfunction in spite of the lack of gross lesions on MRI. Therefore, this study was aimed to evaluate whether transplanted bone marrow stromal cells (BMSC) can improve DAI-induced cognitive dysfunction or not. The rats were subjected to impact acceleration head injury, using a pneumatic high-velocity impactor. The BMSC were harvested from the mice and were cultured. The BMSC (4.0 × 105 cells) or vehicle were stereotactically transplanted into the right striatum at 10 days post-injury. Cognitive function analysis was repeated at 1, 2, and 4 weeks post-injury, using the Morris water maze test. Histological analysis was performed at 2, 8 and 20 weeks post-injury, using double fluorescence immunohistochemistry. Transplanted BMSC were widely distributed in the injured brain and gradually acquired the phenotypes of neurons and astrocytes over 20 weeks. In addition, they significantly improved DAI-induced cognitive dysfunction as early as 2 weeks post-injury, although their processes of neuronal differentiation were not completed at this time point. The findings suggest that the engrafted BMSC may exhibit this early beneficial effect on cognitive function by producing neuroprotective or neurotrophic factors. In conclusion, direct transplantation of BMSC may serve as a novel therapeutic strategy to enhance the recovery from DAI-induced cognitive impairment.
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