Downregulation of CCL2 induced by the upregulation of microRNA-206 is associated with the severity of HEV71 encephalitis

Molecular Medicine Reports
Guangyou ZhangBaohai Shi


MicroRNAs (miRNAs) have been investigated widely as key regulators of gene expression in different diseases by affecting the miRNA‑mediated regulatory function. Human enterovirus 71 (HEV71) can cause a series of human diseases, including encephalitis. Chemokine (C‑C motif) ligand 2 (CCL2) is one of the important genes involved in regulating inflammation. However, the mechanisms underlying HEV71 encephalitis mediated by CCL2 remain to be elucidated. In the present study, reverse transcription‑quantitative polymerase chain reaction analysis was used to determine the expression level of miR‑206 and the mRNA expression of CCL2 in samples. Western blot analysis was used to detect the protein levels of CCL2. A luciferase assay was used to verify the miR‑206 target site in CCL2. A CCK‑8 assay and flow cytometry were used to determine cell proliferation and apoptosis. The results demonstrated that miR‑206 was downregulated in severe HEV71 encephalitis. Using bioinformatics analysis, miR‑206 was predicted to target the human CCL2 3'‑untranslated region (3'‑UTR). A dual‑luciferase assay demonstrated that miR‑206 downregulated the expression of CCL2 by directly targeting its 3'‑UTR, whereas CCL2 3'‑UTR mutations completely eliminated its ...Continue Reading


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