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Transcriptome analysis of PBMCs isolated from piglets treated with a miR-124 sponge construct identified miR124/IQGAP2/Rho GTPase as a target pathway support Salmonella Typhimurium infection

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Abstract

miR-124 is a significantly up-regulated miRNA in peripheral blood collected from piglets infected with Salmonella Typhimurium, suggesting that it may play an important role in Salmonella pathogenesis. This study focused on the transcriptomic analysis of peripheral blood mononuclear cells (PBMCs) isolated from miR-124 sponge and Salmonella Typhimurium-treated piglets, and trying to investigate the function of miR-124 in Salmonella infection. The transcriptome profiling analysis revealed that 2778 genes in miR-124 sponge + Salmonella Typhimurium treatment versus control, 2271 genes in Salmonella Typhimurium treatment versus control, and 1301 genes in miR-124 sponge + Salmonella Typhimurium versus Salmonella Typhimurium treatment, were differentially expressed, respectively (FDR < 0.05 and fold change > 2.0). Pathway analysis indicated that the MAPK signaling pathway, Ribosome pathway, and T-cell receptor signaling pathway were the most significantly enriched pathway in differentially expressed genes between miR-124 sponge + Salmonella Typhimurium and Salmonella Typhimurium along treatment (FDR < 0.05). Reporter assays and electrophoretic mobility shift assays showed that miR-124 is a crucial regulatory factor that targets IQ motif containing GTPase-activating protein 2 (IQGAP2). Cell culture experiment indicated that miR-124 attenuated the Salmonella Typhimurium-mediated activation of CDC42 and RAC1 (P < 0.05). Cultured PBMCs treated with miR-124 and IQGAP2-siRNA had higher intracellular Salmonella count than control samples, particularly 12 h post-infection (P < 0.05). Immunofluorescence analysis revealed that miR-124 treatment reduced the percentage of LAMP-1-positive phagosomes. The miR-124 could be an important regulator for IQGAP2/Rho GTPase pathway in Salmonella Typhimurium-infected PBMCs, and this pathway could be a target for Salmonella that support its infection in PBMCs in piglets.

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Availability of data and materials

The datasets generated and analyzed during the current study are available in the GEO repository (GSE189380).

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Acknowledgements

This project was funded by the National Natural Science Foundation of China [NSFC Grant No. 31902231 and 31402055], the College Students' Innovation and Entrepreneurship Training Program of Yangtze University [Grant No. 2020084], the Teaching research project of Yangtze University [Grant No. JY2020125], and the Graduate Students Teaching Program of Yangtze University [Grant No. YAL202108]. We thank Editage for professional English editing service.

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TH, JY, and MY designed the study, performed the experiments and data analysis, and wrote the manuscript. QT, ZH, HX, CY, and ZL helped conduct the pig infection experiments, and TH performed the RNA extraction. All authors have read and approved the final version of the manuscript.

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Correspondence to Jing Yuan or Min Yao.

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The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

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The animal study was approved by the Animal Care and Use Committee of Hubei Province (China, YZU-2018-0031).

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Huang, T., Tian, Q., He, Z. et al. Transcriptome analysis of PBMCs isolated from piglets treated with a miR-124 sponge construct identified miR124/IQGAP2/Rho GTPase as a target pathway support Salmonella Typhimurium infection. Mol Genet Genomics 298, 213–227 (2023). https://doi.org/10.1007/s00438-022-01976-1

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