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Anti-Apoptotic Effect of IGF1 on Schwann Exposed to Hyperglycemia is Mediated by Neuritin, a Novel Neurotrophic Factor

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Abstract

The aim of the present study is to explore the effects of exogenous insulin-like growth factor-1 (IGF1) on hyperglycemia-induced apoptosis of Schwann cells via neuritin-mediated pathway. Neuritin was identified with immunohistochemistry. Exogenous IGF1 was used to prevent possible changes in neuritin expression and apoptosis of Schwann cells isolated from rat sciatic nerves and cultured in high-glucose media. Neuritin silencing or overexpressing lentivirus transfection of Schwann cells was conducted. Expressions of neuritin at levels of transcription or translation were measured using quantitative PCR or Western blot. Caspase-3 and caspase-9 fluorometric assays were performed. Bcl-2 and Bax were assayed using Western blotting. Apoptosis of Schwann cells was measured using FACS analysis and TUNEL assay. A pathway of IGF1 action in relation to neuritin was explored. Neuritin and Bcl-2 protein were localized in Schwann cells of rats’ sciatic nerves. In vitro, apoptosis increased with downregulated neuritin expression, which was prevented by exogenous IGF1 treatment in contrast to without, in Schwann cells isolated from rat sciatic nerve and cultured in high-glucose and serum-free media. A phosphatidylinositol-3-kinase (PI3K) inhibitor treatment blocked the action of IGF1. The inhibitor did not affect the apoptosis rate that decreased obviously after neuritin was overexpressed in Schwann cells. The apoptosis rate increased drastically after neuritin was silenced, and the resultant apoptosis was suppressed by a caspase inhibitor treatment but not affected by exogenous IGF1. The activities of caspase-3 and caspase-9 changed positively with apoptosis. An anti-apoptotic protein (Bcl-2) not Bax increased or decreased in neuritin-overexpressed or neuritin-silenced Schwann cells, respectively. Bcl-2-selective inhibitor blocked the anti-apoptotic effect of neuritin. IGF1 or neuritin was not found to affect glucose levels in media during the experiment. The anti-apoptotic effect of IGF1 on Schwann cells inflicted by hyperglycemia is mediated at least by neuritin, a novel neurotrophic factor, through PI3K and Bcl-2.

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Acknowledgements

We would like to thank the National Natural Science Foundation (81070655) of China, Jiangsu Provincial Natural Science Foundation (No. BK2009441) of China, and Suzhou Scientific Foundation (SYS 2101303) of China - Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions for supporting this project. This work would not have been possible without the funds.

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Authors and Affiliations

  1. Endocrinology and Metabolism Department, The First Affiliated Hospital of Nanjing Medical University, Guangzhou Road 300, Nanjing, 210029, China

    Lingfei Yan, Min Xie, He Lu, Hongman Zhang, Min Shi, Yingduan Zhang, Chunhong Xi, Jianbo Li & Tao Yang

  2. Diabetic Neuropathy Study Group of Chinese Diabetes Society, 42 Dongsi Xidajie, Beijing, China

    Jianbo Li

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  1. Lingfei Yan
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  2. Min Xie
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  5. Min Shi
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Correspondence to Jianbo Li.

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Financial Support

This project was supported by the National Natural Science Foundation (81070655) of China, Jiangsu Provincial Natural Science Foundation (No. BK2009441), and Suzhou Scientific Foundation (SYS 2101303) of China.

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The authors declare that they have no conflict of interest.

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Lingfei Yan, Min Xie, He Lu and Hongman Zhang contributed equally to the work.

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Yan, L., Xie, M., Lu, H. et al. Anti-Apoptotic Effect of IGF1 on Schwann Exposed to Hyperglycemia is Mediated by Neuritin, a Novel Neurotrophic Factor. Mol Neurobiol 55, 495–505 (2018). https://doi.org/10.1007/s12035-016-0331-3

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  • DOI: https://doi.org/10.1007/s12035-016-0331-3

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