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. 2020 Oct 15;11(10):863. doi: 10.1038/s41419-020-03034-3

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 5 — a After treated with CHX in three different time points, the protein level of IKKβ was tested in LPS-treated MLE-12 cells with or without MSC-exosome. b The protein level of IKKβ was detected in LPS-treated MLE-12 cells treated with control or MSC-exosome or control+MG132 or MSC-exosome+MG132. c Ubiquitination assay detected the ubiquitination of IKKβ protein in LPS-treated MLE-12 cells treated with MSC-exosome. d Pull-down silver staining was applied to unveil the proteins that might interact with IKKβ. e Co-IP assay demonstrated the interaction between Usp5 and IKKβ. f RT-qPCR and western blot examined the overexpression efficiency of Usp5 and the protein level of IKKβ in response to Usp5 overexpression. g Western blot analyzed the protein level of IKKβ in LPS-treated MLE-12 cells under four situations (control, MSC-exosome, MSC-exosome+pcDNA3.1/Usp5, or MSC-exosome+pcDNA3.1/Usp5+miR-182-5p inhibitor). h Luciferase reporter assays indicated the relative luciferase activity of Usp5 promoter in LPS-treated MLE-12 cells treated with MSC-exosome. i RT-qPCR and western blot detected the mRNA level and protein level of Usp5 in LPS-treated MLE-12 cells treated with MSC-exosome or MSC/sh-Dicer-exosome. ^**p < 0.01. n.s. no statistical significance.