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Lentiviral Vector-Mediated p27kip1 Expression Facilitates Recovery After Spinal Cord Injury

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Abstract

Traumatic spinal cord injury (SCI) causes tissue loss and associated neurological dysfunction attributable to both mechanical damage and secondary biochemical and physiological responses. Upregulation of cell cycle proteins occurs in both neurons and glia after SCI and may contribute to these changes. Increased cell cycle protein is associated with neuronal and oligodendroglial apoptosis, reactive astrogliosis, glial scar formation, and microglial activation. Here, using lentiviral vectors (LV), we induced the expression of the cyclin-dependent kinase (CDK) inhibitor p27kip1 in the lesioned spinal cord of adult rat. Treatment with LV-p27kip1 significantly reduced the expression of cell cycle proteins and improved functional recovery. In addition, p27kip1 overexpression also reduced lesion volume, decreased astrocytic reactivity, attenuated microglial activation, reduced cell death, and improved the local microenvironment. We suggest that these effects reflect the ability of p27kip1 to inhibit cell cycle pathways. Thus, the present study provides further support for the therapeutic potential of cell cycle inhibitors in the treatment of SCI.

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Abbreviations

SCI:

Spinal cord injury

CDKs:

Cyclin-dependent kinases

CDKIs:

Cyclin-dependent kinase inhibitors

pRb:

Phosphorylated retinoblastoma protein

BBB:

Basso, Beattie, and Bresnahan scale

CBS:

Combined behavioral score

PCNA:

Proliferating cell nuclear antigen

NeuN:

Neuronal nuclear antigen

GFAP:

Glial fibrillary acidic protein

IBa1:

Ionized calcium-binding adapter molecule 1

MBP:

Myelin basic protein

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 81171140, No. 81471258, No. 31300902), the Colleges and Universities in Natural Science Research Project of Jiangsu Province (13KJB310009), and a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

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Correspondence to You-hua Wang.

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All surgical interventions and postoperative animal care were carried out in accordance with the Guide for the Care and Use of Laboratory Animals (National Research Council, 1996, USA) and were approved by the Chinese National Committee to the Use of Experimental Animals for Medical Purposes, Jiangsu Branch. All efforts were made to minimize the number of animals used and their suffering.

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The authors declare that they have no competing interests.

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Min-hao Chen and Yong-hua Liu contributed equally to this work.

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Chen, Mh., Liu, Yh., Xu, H. et al. Lentiviral Vector-Mediated p27kip1 Expression Facilitates Recovery After Spinal Cord Injury. Mol Neurobiol 53, 6043–6056 (2016). https://doi.org/10.1007/s12035-015-9498-2

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