Volume 29, Issue 4 pp. 422-432

Transplanted bone marrow stromal cells improves cognitive dysfunction due to diffuse axonal injury in rats

Katsuhiko Maruichi

Katsuhiko Maruichi

Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan

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Satoshi Kuroda

Satoshi Kuroda

Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan

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Yasuhiro Chiba

Yasuhiro Chiba

Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan

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Masaaki Hokari

Masaaki Hokari

Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan

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Hideo Shichinohe

Hideo Shichinohe

Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan

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Kazutoshi Hida

Kazutoshi Hida

Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan

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Yoshinobu Iwasaki

Yoshinobu Iwasaki

Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan

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First published: 15 July 2009
Citations: 17
Satoshi Kuroda, MD, PhD, Department of Neurosurgery, Hokkaido University Graduate School of Medicine, North 15 West 7, Kita-ku, Sapporo 060-8638, Japan. Email: [email protected]

Abstract

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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