Objective To investigate the effects of long-term exposure to chrysotile and crocidolite on miRNAs and epithelial mesenchymal transformation(EMT)-related gene expression in human pleural mesothelial cells.Methods In November 2020,fluorescence quantitative polymerase chain reaction(RT-qPCR)was used to detect the expressions of EMT-related genes in human pleural mesothelioma cells(NCl-H2052 cells,NCl-H2452 cells)and human normal mesothelial cells(Met-5A cells).MiRNAs with abnormal expression in human pleural mesothelioma cells were screened out from the previous miRNA chip data of research group,and target genes of differentially expressed miRNAs were predicted using miRWalk database(http://mirwalk.umm.uni-heidelberg.de).RT-qPCR was used to verify the abnormal expression of EMT-related miRNAs in cell lines.Met-5A cells were treated with 5μg/cm2 chrysotile and crocidolite respectively for 48 h a time,once a week and a total of 10 times.Chrysotile group,crocidolite group and control group were set up.And the control group was added with the same volume of PBS.The expression changes of EMT-related genes and abnormal expression miRNAs in each group were detected by RT-qPCR.The differences among the groups were compared by one-way ANOVA,and the differences between the control group and the experimental group were compared by dunnet-t test.Results Compared with Met-5A cells,the expression levels of Vimentin and Twist genes were increased,and the expression level of E-cadherin genes was decreased in NCl-H2052 cells and NCl-H2452 cells(P＜0.001).Target genes of miRNAs with abnormal expression in miRNA chip were predicted,and the results showed four abnormally expressed miRNAs associated with EMT and verified the expression of these four miRNAs in the cell lines.Compared with Met-5A cells,the expression level of hsa-miR-155-5p was increased in NCl-H2052 cells and NCl-H2452 cells,the expression levels of hsa-miR-34b-5p,hsa-miR-34c-5p and hsa-miR-28-5p were decreased in NCl-H2052 cells and NCl-H2452 cells(P＜0.001),which was consistent with the results of chip analysis.After exposure of Met-5A cells,it was found that compared with the control group,the expression levels of Vimentin and Twist genes,hsa-miR-155-5p,hsa-miR-34b-5p and hsa-miR-34c-5p in the crocidolite group were increased,while the expression level of E-cadherin gene was decreased(P＜0.05).Compared with the control group,the expression levels of Vimentin,Twist and E-cadherin genes in chrysotile group were increased,while the expression levels of hsa-miR-34b-5p,hsa-miR-34c-5p and hsa-miR-28-5p were decreased(P＜0.05).Conclusion Long-term exposure to chrysotile and crocidolite could cause Met-5A cells to produce miRNAs and EMT-related gene expression changes similar to mesothelioma cells.
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