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SIRT1-Enriched Exosomes Derived from Bone Marrow Mesenchymal Stromal Cells Alleviate Peripheral Neuropathy via Conserving Mitochondrial Function

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Abstract

Diabetic peripheral neuropathy (DPN) is a highly prevalent diabetic complication characterized at the molecular level by mitochondrial dysfunction and deleterious oxidative damage. No effective treatments for DPN are currently available. The present study was developed to examine the impact of exosomes derived from bone marrow mesenchymal stromal cells (BMSCs) overexpressing sirtuin 1 (SIRT1) on DPN through antioxidant activity and the preservation of mitochondrial homeostasis. A DPN model was established using 20-week-old diabetic model mice (db/db). Exosomes were prepared from control BMSCs (exo-control) and BMSCs that had been transduced with a SIRT1 lentivirus (exo-SIRT1). Sensory and motor nerve conduction velocity values were measured to assess neurological function, and mechanical and thermal sensitivity were analyzed in these animals. Exo-SIRT1 preparations exhibited a high loading capacity and readily accumulated within peripheral nerves following intravenous administration, whereupon they were able to promote improved neurological recovery relative to exo-control treatment. DPN mice exhibited significantly improved nerve conduction velocity following exo-SIRT1 treatment. Relative to exo-control-treated mice, those that underwent exo-SIRT1 treatment exhibited significantly elevated TOMM20 and Nrf2/HO-1 expression, reduced MDA levels, increased GSH and SOD activity, and increased MMP. Together, these results revealed that both exo-control and exo-SIRT1 administration was sufficient to reduce the morphological and behavioral changes observed in DPN model mice, with exo-SIRT1 treatment exhibiting superior therapeutic efficacy. These data thus provide a foundation for future efforts to explore other combinations of gene therapy and exosome treatment in an effort to alleviate DPN.

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Availability of Data and Materials

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Funding

The work was supported by the Medical Health Science and Technology Project of Zhejiang Provincial Health Commission (grant number: 2022KY583) and Natural Science Foundation of Zhejiang Province (grant number: LQ19H160014).

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Contributions

All the authors contributed to the study conception and design. Material preparation and data collection and analysis were performed by Lizhen Shan, Fenfen Zhan, Detao Lin, Fabo Feng, Xinji Chen, and Xiaolin Li. The first draft of the manuscript was written by Lizhen Shan, Fenfen Zhan, and Di Yang, and all the authors commented on previous versions of the manuscript. All the authors read and approved the final manuscript.

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Correspondence to Di Yang.

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Ethics Approval

All animal procedures were approved by the Institutional Animal Care and Use Committee (IACUC) of Zhejiang Provincial People’s Hospital (Approval No. 20200033). and all experiments were conducted in strict accordance with NIH Guidelines for the Care and Use of Laboratory Animals.

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The authors declare no competing interests.

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Shan, L., Zhan, F., Lin, D. et al. SIRT1-Enriched Exosomes Derived from Bone Marrow Mesenchymal Stromal Cells Alleviate Peripheral Neuropathy via Conserving Mitochondrial Function. J Mol Neurosci 72, 2507–2516 (2022). https://doi.org/10.1007/s12031-022-02091-x

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  • DOI: https://doi.org/10.1007/s12031-022-02091-x

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