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. 2024 Jul 18;15:216. doi: 10.1186/s13287-024-03834-w

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© The Author(s) 2024

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 4 — Flow cytometry analyses of B cell, plasma cell, and B1 cell among splenocytes and KIIs of MRL/lpr mice after hUCMSC-EVs treatment. (a, c) Representative flow cytometry analyses images of CD19⁺CD3⁻ (B cell) and CD45⁺CD3⁻CD19⁻CD138⁺ (plasma cell) among splenocytes. (b, d, e) Percentages of B cell, plasma cell, and B1 cell among splenocytes of normal mice or MRL/lpr mice treated by PBS, hUCMSCs or hUCMSC-EVs. (f, g, h) The frequency of B cell, plasma cell, and B1 cell among KIIs of MRL/lpr mice treated by PBS, hUCMSCs, or hUCMSC-EVs. Data are expressed as mean ± SD, *p < 0.05, **p < 0.01, *** p < 0.001 vs. the PBS group