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Enhanced neuroregenerative effects by scaffold for the treatment of a rat spinal cord injury with Wnt3a-secreting fibroblasts

  • Experimental research - Spine
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Abstract

Background

Wnt proteins are bifunctional axon guidance molecules, several of which appear to mediate guidance of corticospinal tract axons along the spinal cord. Here, we studied increasing effect on regeneration by Wnt-containing alginate scaffolds on spinal cord injury (SCI).

Methods

A total of 32 rats were injured at the T7–8 level with an NYU impactor. According to transplantation materials, rats were classified into four groups: a Wnt3a-secreting fibroblast transplantation group (Wnt group, n = 8), a Wnt3a-secreting fibroblast with alginate transplantation group (Wnt + alginate group, n = 8), an alginate transplantation group (alginate group, n = 8), and a contusion-only group (sham group, n = 8). Behavioral tests were performed on the first, second, and third days after injury, and then weekly for 8 weeks. Five of the eight rats from each group were selected for manganese-enhanced magnetic resonance imaging (ME-MRI). Two rats from each group were examined for GAP43 and MAP2 expression using monoclonal and polyclonal primary antibodies, respectively.

Results

Seven weeks after transplantation (8 weeks after SCI), Wnt + alginate group rats achieved an average Basso–Beattie–Bresnahan locomotor score of 19.0, which was significantly higher than that of other groups. ME-MRI at 8 weeks after SCI revealed significantly higher relative signal intensities in the Wnt + alginate group. Gap43 and Map2 immunostaining, showed strong positive in the Wnt + alginate group.

Conclusion

The Wnt + alginate complex exerted significantly enhanced recovery in a rat SCI model compared to alginate or Wnt3a alone. These results suggest that alginate scaffolds facilitate the regeneration of axon working with Wnt3a protein that promotes regeneration of the injured spinal cord.

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Acknowledgment

This work was supported by an Asan Life Science Institute Grant (12-176) from the Asan Medical Center, Seoul, Korea, and by the Pioneer Research Center Program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology (2012-0000447).

Conflicts of interest

None.

Author information

Authors and Affiliations

  1. Department of Neurological Surgery, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, South Korea

    Jin Hoon Park

  2. Department of Neurological Surgery, Asan Medical Center, University of Ulsan College of Medicine, 388-1 Pungnap-2dong, Songpa-gu, Seoul, 138-736, South Korea

    Joongkee Min, Se Rim Baek & Sang Ryong Jeon

  3. Department of Biochemistry and Molecular Biology, University of Ulsan College of Medicine, Ulsan, Republic of Korea

    Seong Who Kim

  4. Department of Maxillofacial Biomedical Engineering, Institute of Oral Biology, School of Dentistry, Kyung Hee University, Seoul, Republic of Korea

    Il Keun Kwon

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  1. Jin Hoon Park
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  2. Joongkee Min
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Correspondence to Sang Ryong Jeon.

Additional information

Jin Hoon Park and Joongkee Min contributed equally to this work.

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Park, J.H., Min, J., Baek, S.R. et al. Enhanced neuroregenerative effects by scaffold for the treatment of a rat spinal cord injury with Wnt3a-secreting fibroblasts. Acta Neurochir 155, 809–816 (2013). https://doi.org/10.1007/s00701-013-1663-7

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  • DOI: https://doi.org/10.1007/s00701-013-1663-7

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