Mesenchymal Stem Cell-Derived Exosomes Attenuate TLR7-Mediated Mast Cell Activation

Kyung Ah Cho, Je Eun Cha, Jungwoo Kim, Yu Hee Kim, Kyung Ha Ryu, So Youn Woo

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Background:: Mast cells are immune sentinels in the skin that respond to a wide range of pathological and environmental stimuli; they owe their function to the expression of Toll-like receptors (TLRs). We previously found that tonsil-derived mesenchymal stem cells (T-MSCs) were able to effectively attenuate TLR7-mediated skin inflammation in mice, which was accompanied by an increase in mast cell number. The present study investigated whether T-MSC extracellular vesicles, such as exosomes, are able to regulate mast cell activation in response to TLR7 stimulation. Methods:: The HMC-1 human mast cell line was treated with a TLR7 agonist in the presence or absence of T-MSC exosomes, and the levels of expressed inflammatory cytokines were assessed. Additionally, mice were repeatedly injected with a TLR7 agonist with or without interval treatments with T-MSC exosomes and assessed dermal distribution of mast cells and related immune cells. Results:: We showed that T-MSC exosomes containing microRNAs that target inflammatory cytokines significantly reduced the expression of inflammatory cytokines in TLR7 agonist-treated HMC-1 cells. In addition, T-MSC exosomes inhibited the increase in the number of both dermal mast cells and CD14-positive cells in TLR7 agonist-treated mice. Conclusion:: Our data suggest that T-MSC exosomes have regulatory effects on mast cell activation under inflammatory conditions, including TLR7 stimulation.

Original languageEnglish
Pages (from-to)117-129
Number of pages13
JournalTissue Engineering and Regenerative Medicine
Issue number1
StatePublished - Feb 2022

Bibliographical note

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© 2021, The Korean Tissue Engineering and Regenerative Medicine Society.


  • Exosomes
  • Mast cell
  • Mesenchymal stem cell
  • TLR7


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