Abstract
MicroRNAs (miRNAs) are crucial in the process of host–pathogen interaction. In this study, we established a screening system for miRNAs of target genes to detect the effect of miRNAs on Enterovirus 71 (EV71) replication in rhabdomyosarcoma (RD) cells. A 3’-untranslated region (UTR) dual-luciferase assay was performed to confirm putative miRNA targets in EV71 genome. Firstly, 13 fragments of EV71 genome were inserted into the vector pMIR, and luciferase activities were analyzed to identify the putative miRNAs of target genes. The expression of the reporter protein was significantly downregulated in cells transfected with the vector containing gene VP3. Then we screened for miRNAs that might target to VP3 through online analysis software. In addition, Western blot, real-time PCR, virus titration, and morphological changes were considered to examine the effects of miRNAs on virus replication. The results suggested that miR-18a and miR-452 repress the reproduction of EV71 virus by binding to VP3. Moreover, EV71 infection also affected the expression of endogenous miR-18a and miR-452. In addition, no significant cytotoxic effects were observed. The results from this study suggest that the intracellular miRNAs may play vital roles in the host–virus interaction.
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All data presented in this study are available from the corresponding author upon reasonable request.
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This study was supported by grant from Operating Project of Public Health Emergency Response Mechanism of National Institute for Nutrition and Health, C CDC (131031107000160002).
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ZY designed the study. ZY, WQ, JW, and LW performed the experiments. ZY analyzed and interpreted data. ZY wrote, reviewed, and revisioned the manuscript. QZ and PT provided administrative, technical, and material support.
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Fig.S1
Analysis of the specificity and cytotoxicity of miR-18a and miR-452. a Viability of RD cells (as an indicator of cytotoxicity) was determined by the CCK-8 assay after transfection with miRNA mimics or inhibitor. Absorbance values of the cells were measured at 450 nm. b The levels of IFN-α and IFN-β in the cells were determined by measuring the absorbance values at 450 nm (JPG 259 kb)
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Yang, Z., Zhuo, Q., Qin, W. et al. MicroRNAs miR-18a and miR-452 regulate the replication of enterovirus 71 by targeting the gene encoding VP3. Virus Genes 57, 318–326 (2021). https://doi.org/10.1007/s11262-021-01842-z
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DOI: https://doi.org/10.1007/s11262-021-01842-z