Abstract
Recent researches have shown that autophagy is associated with the pathogenesis of neurodegenerative disorders, but there is no paper to investigate the effects of autophagy modulation on Parkinson’s disease depression (PDD). In addition, glycyrrhizic acid (GA), the major bioactive ingredient of Radix glycyrrhizae, can induce autophagy and ease rotenone-induced Parkinson’s disease (PD). However, there is also no paper to study the action and molecular mechanisms of GA on PDD. In this research, we built the injury model of SH-SY5Y cells through 6-hydroxydopamine (6-OHDA) and corticosterone (CORT). Then, our results showed that GA markedly increased the viability and decreased the apoptosis in SH-SY5Y cells after pre-treating with 6-OHDA and CORT. Moreover, GA notably decreased the expressions of α-Syn and p-S1292-LRRK2 proteins, and significantly increased the levels of CREB and BDNF proteins. Previous papers have suggested that CORT contributed to dopaminergic neurodegeneration via the glucocorticoid (GC)/glucocorticoid receptor (GR) interaction, and our results showed that GA reduced GC level and hypothalamic–pituitary–adrenal (HPA) activity in SH-SY5Y cells by regulating GR signaling pathway. Furthermore, mechanism investigations also showed that GA had the ability to up-regulate the conversion of LC3B II/I and the expression of Beclin-1, and induce autophagy in SH-SY5Y cells, which were reversed by the autophagy inhibitor 3-methyladenine (3-MA). Collectively, these findings proved that GA exerted efficient activity against neurotoxicity in SH-SY5Y cells induced by 6-OHDA and CORT via activation of autophagy, which should be developed as an efficient candidate for treating PDD in the future.
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Funding
This work was supported by National Natural Science foundation of China (No. 81573922), Hubei province technical innovation project (No. 2017ACA176), Natural Science Foundation of Guangdong Province (No. 2017ZC0135) and Elite Youth Education Program of Guangzhou University of Chinese Medicine (No. QNYC20140104).
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Yang, G., Li, J., Cai, Y. et al. Glycyrrhizic Acid Alleviates 6-Hydroxydopamine and Corticosterone-Induced Neurotoxicity in SH-SY5Y Cells Through Modulating Autophagy. Neurochem Res 43, 1914–1926 (2018). https://doi.org/10.1007/s11064-018-2609-5
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DOI: https://doi.org/10.1007/s11064-018-2609-5