Abstract
Circular RNAs (circRNAs) was suggested to play crucial regulatory roles in various human diseases, including Parkinson’s disease (PD). This research aimed to investigate the function and potential mechanism of circ_0070441 in PD. MPP+ (1-methyl-4-phenylpyridinium)-treated SH-SY5Y cells was used as an in vitro cellular PD model. The expressions of circ_0070441, microRNA (miR)-626 and insulin receptor substrate 2 (IRS2) were measured by quantitative real-time polymerase chain reaction (RT-qPCR) or western blot. Cell Counting Kit-8 (CCK-8) assay, Cytotoxicity Detection Kit (Lactate Dehydrogenase), flow cytometry and Caspase-3 Assay Kit were used to detect cell viability, LDH release, cell apoptosis and caspase-3 activity, respectively. The levels of inflammation-related factors were detected by enzyme-linked immunosorbent assay (ELISA). The correlation among circ_0070441, miR-626 and IRS2 were confirmed by dual-luciferase reporter assay, RNA immunoprecipitation (RIP) assay and RNA pull-down assay. The levels of circ_0070441 and IRS2 were increased while miR-626 expression was decreased in MPP+-treated SH-SY5Y cells in dose- and time-dependent manners. Depletion of circ_0070441 alleviated MPP+-triggered neuronal damage by regulating cell apoptosis and inflammation. Circ_0070441 acted as a sponge for miR-626, and IRS2 was a target of miR-626. Besides, the neuroprotective effects of circ_0070441 knockdown or miR-626 overexpression were partly overturned by the suppression of miR-626 or IRS2 overexpression. Moreover, circ_0070441 upregulated IRS2 expression by interacting with miR-626. In summary, circ_0070441 aggravated MPP+-triggered neurotoxic effect in SH-SY5Y cells by regulating miR-626/IRS2 axis.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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The project was funded by Ningxia Hui Autonomous Region Key Research and Development Project (No. 2017BY037) and Ningxia Natural Science Foundation Project (No. NZ17189).
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XC and JG designed, supervised the study, conducted the experiments and drafted the manuscript. DX, TZ and HH collected and analyzed the data. HM and TM contributed the methodology and analyzed the data. MQ and JH operated the software and edited the manuscript. XC was a major contributor in writing the manuscript. All authors read and approved the final manuscript.
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Xuqing Cao and Jiangtao Guo are co-authors.
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Cao, X., Guo, J., Mochizuki, H. et al. Circular RNA circ_0070441 regulates MPP+-triggered neurotoxic effect in SH-SY5Y cells via miR-626/IRS2 axis. Metab Brain Dis 37, 513–524 (2022). https://doi.org/10.1007/s11011-021-00869-3
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DOI: https://doi.org/10.1007/s11011-021-00869-3