Abstract
Oxidative stress is a potential pathological mechanism of Alzheimer’s disease (AD). Berberine (BBR) can improve antioxidative capacity and inhibit Aβ protein aggregation and tau protein hyperphosphorylation in AD, and stem cell therapy is also increasingly recognized as a therapy for AD. Bone marrow mesenchymal stem cells (BMSCs) have many advantages, as they exhibit antioxidant and anti-inflammatory activity and secrete a variety of neurotrophic factors, and play important roles in neurodegenerative disease treatment. In this study, we investigated the antioxidant effects of secretions from BMSCs pretreated with BBR on tert-butyl hydroperoxide (t-BHP)–damaged neurons. We demonstrated that BBR can enhance BMSC viability and the secretion of nerve growth factor (NGF) and brain-derived neurotrophic factor (BDNF), both of which are vital neurotrophic factors that maintain neuronal growth. Moreover, conditioned medium from BBR-treated BMSCs (BBR-BMSC-CM) reduced reactive oxygen species (ROS) production, attenuated a decrease in the mitochondrial membrane potential, and ameliorated neuronal apoptosis by decreasing levels of the apoptotic proteins Bax/Bcl-2, cytochrome c, and cleaved caspase-3/caspase-3. In addition, increased synaptophysin (SYP) and postsynaptic density protein 95 (PSD95) levels indicated that neuronal synaptic function was restored. Further study revealed that BBR-BMSC-CM activated the antioxidant proteins Keap1, Nrf2, and HO-1. In conclusion, our results showed that BBR-BMSC-CM attenuated apoptosis and oxidative damage in neurons by activating the Keap1-Nrf2-HO-1 signaling pathway. Taken together, these results also suggest BBR as a drug to stimulate the secretion of nutritional cytokines with the potential to treat AD.
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Acknowledgments
The authors would like to thank the staff of the Department of Pathophysiology, Institute of Brain Science Research in Jinan University (Guangzhou, Guangdong Province, China), for their technical assistance. The authors are also grateful to AJE for polishing the language of the article.
Funding
This work was supported by grants from the National Natural Science Foundation of China (Nos. 81471236 and 81371442).
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Caiyan Wen and Cuiqin Huang contributed equally to this work. Caiyan Wen: methodology, data analysis, and writing of original draft; Cuiqin Huang: methodology and data analysis; Mei Yang: methodology and data analysis; Chongzhu Fan: review and editing; Qin Li: review and editing; Jiayi Zhao: methodology; Danhui Gan: review and editing; An Li: review and editing; Lihong Zhu: supervision, review, and editing; Daxiang Lu: conceptualization, supervision, funding acquisition, review, and editing. All authors have read, revised, and approved the final manuscript.
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The experimental protocols were approved by the Ethics Committee of the Institute of Laboratory Animal Science, Jinan University (certificate number: 20160503112404). This article does not contain any studies with human participants performed by any of the authors.
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Wen, C., Huang, C., Yang, M. et al. The Secretion from Bone Marrow Mesenchymal Stem Cells Pretreated with Berberine Rescues Neurons with Oxidative Damage Through Activation of the Keap1-Nrf2-HO-1 Signaling Pathway. Neurotox Res 38, 59–73 (2020). https://doi.org/10.1007/s12640-020-00178-0
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DOI: https://doi.org/10.1007/s12640-020-00178-0