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Exercise increases neural stem cell proliferation surrounding the area of damage following rat traumatic brain injury

  • Basic Neurosciences, Genetics and Immunology - Original Article
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Abstract

Exercise enhances neuronal stem cell (NSC) proliferation and neurogenesis. However, the effect of exercise on NSC proliferation surrounding the area of damage after traumatic brain injury (TBI) is unknown. Here, we investigate the effect of running on NSC proliferation following TBI in the rat. Wistar rats received TBI and were randomly divided into two groups: (1) non-exercise group and (2) exercise group. The exercise group ran on a treadmill for 30 min/day at 22 m/min for 7 consecutive days. Immunohistochemistry was used to monitor NSC proliferation around the damaged area, and ex vivo techniques were used to isolate NSCs from the damaged region in both groups. The number of nestin- and Ki67-positive cells observed at 3 and 7 days after TBI was significantly greater in the exercise group than in the non-exercise group (P < 0.01). Furthermore, most nestin-positive cells in the exercise group co-localized with Ki67-positive cells. In ex vivo studies, spheres could be isolated from injured brain tissue from the exercise group at 3 and 7 days following TBI, but at only 3 days in the non-exercise group. The number of spheres isolated from injured brain tissue was greater in the exercise group than in the non-exercise group. Spheres were immunopositive for nestin and comprised NSCs that could differentiate into neurons and glia. Exercise increases the proliferation of NSCs around the damaged area following TBI. Therefore, exercise therapy (rehabilitation) in the early phase following TBI is important for recuperation from cerebral dysfunction induced by TBI.

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Acknowledgments

This work was supported by a Grant-in-Aid for Scientific Research (20500472 and 21500803) and ZENRYOKEN. The authors thank Mari Yachi for technical assistance.

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Correspondence to Tatsuki Itoh.

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Itoh, T., Imano, M., Nishida, S. et al. Exercise increases neural stem cell proliferation surrounding the area of damage following rat traumatic brain injury. J Neural Transm 118, 193–202 (2011). https://doi.org/10.1007/s00702-010-0495-3

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  • DOI: https://doi.org/10.1007/s00702-010-0495-3

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