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Long noncoding RNA SNHG14 knockdown exerts a neuroprotective role in MPP+-induced Parkinson’s disease cell model through mediating miR-135b-5p/KPNA4 axis

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Abstract

Background

Parkinson’s disease (PD) is a neurodegenerative disease resulted from the loss of dopaminergic neurons. Here, we analyzed the role of long noncoding RNA (lncRNA) small nucleolar RNA host gene 14 (SNHG14) in PD using 1-methyl-4-phenyl pyridine (MPP+)-induced PD cell model.

Methods

Reverse transcription-quantitative polymerase chain reaction (RT-qPCR) and Western blot assay were performed to determine RNA and protein expression, respectively. 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay and flow cytometry (FCM) analysis were conducted to analyze cell viability and apoptosis. Enzyme-Linked Immunosorbent Assay (ELISA) was conducted to analyze the release of inflammatory cytokines. Cytotoxicity was assessed using reactive oxygen species (ROS) assay kit, superoxide dismutase (SOD) activity assay kit and lactate dehydrogenase (LDH) activity assay kit. Dual-luciferase reporter assay and RNA immunoprecipitation (RIP) assay were performed to confirm the interaction between microRNA-135b-5p (miR-135b-5p) and SNHG14 or karyopherin subunit alpha 4 (KPNA4).

Results

MPP+ treatment elevated the expression of SNHG14 in SK-N-SH cells in a dose and time-dependent manner. SNHG14 knockdown alleviated MPP+-induced apoptosis, inflammation, and cytotoxicity in SK-N-SH cells. SNHG14 interacted with miR-135b-5p, and SNHG14 silencing-mediated effects were partly overturned by miR-135b-5p knockdown in PD cell model. Besides, miR-135b-5p interacted with the 3’ untranslated region (3’UTR) of KPNA4, and KPNA4 overexpression partly reversed miR-135b-5p overexpression-induced effects in PD cell model. SNHG14 knockdown reduced the protein level of KPNA4 partly by up-regulating miR-135b-5p in SK-N-SH cells.

Conclusion

SNHG14 promoted MPP+-induced neuro injury in PD cell model through mediating miR-135b-5p/KPNA4 axis.

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Availability of data and materials

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

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Authors

Contributions

JF designed and supervised the study. XY was a major contributor in writing the manuscript. YW collected and analyzed the data. LL contributed the methodology and edited the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Jie Feng.

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Supplementary Information

Additional file 1.

 Supplementary Figure 1. Agarose gel electrophoresis was used to confirm the specificity of KPNA4 (one band, 138bp), U6 (one band, 94bp) and GAPDH (one band, 258bp) primers. Supplementary Figure 2. SNHG14 knockdown alleviates MPP+-induced injury in SK-N-SH cells. (A) RT-qPCR was conducted to evaluate the transfection efficiency of LNA-GapmeR in SK-N-SH cells (N=3). (B) Cell viability was analyzed using MTT assay (N=3). (C) FCM analysis was used to measure cell apoptosis rate (N=3). (D and E) ELISA was used to detect the levels of TNF-α and IL-6 in the culture supernatant. (F-H) The generation of ROS and the activities of SOD and LDH were measured using their corresponding kits. A, Student’s t-test; B-H, one-way ANOVA. *P<0.05.

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Yuan, X., Wu, Y., Lu, L. et al. Long noncoding RNA SNHG14 knockdown exerts a neuroprotective role in MPP+-induced Parkinson’s disease cell model through mediating miR-135b-5p/KPNA4 axis. Metab Brain Dis 37, 2363–2373 (2022). https://doi.org/10.1007/s11011-022-01038-w

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