Toll‐like receptor 7 (TLR7) mediated transcriptomic changes on human mast cells

Kyung Ah Cho, Da Won Choi, Minhwa Park, Yu Hee Kim, So Youn Woo

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Background: Mast cells are skin immune sentinels located in the upper dermis, where wheal formation and sensory nerve stimulation take place. Skin inflammation is occasionally accompanied by mast cell-driven responses with wheals, angioedema, or both. Immunoglobulin E (IgE) antibodies are regarded as typical stimuli to drive mast cell activation. However, various causative factors, including microbial infections, can drive IgE-independent mast cell response. When infected, the innate immunity orchestrates an immune response by activating receptor signaling via Toll-like receptors (TLRs). Objective: In this study, we determined the effect of TLR7 stimulation on mast cells to investigate the possible mechanism of IgE-independent inflammatory response. Methods: Human mast cell (HMC) line, HMC-1 cells were treated with TLR7 agonist and the morphologic alteration was observed in transmission electron microscopy. Further, TLR7 agonist treated HMC-1 cells were conducted to RNA sequencing to compare transcriptomic features. Results: HMC-1 cells treated with TLR7 agonist reveals increase of intracellular vesicles, lipid droplets, and ribosomes. Also, genes involved in pro-inflammatory responses such as angiogenesis are highly expressed, and Il12rb2 was the most highly upregulated gene. Conclusion: Our data suggest that TLR7 signaling on mast cells might be a potential therapeutic target for mast cell-driven, IgE-independent skin inflammation.

Original languageEnglish
Pages (from-to)402-408
Number of pages7
JournalAnnals of Dermatology
Issue number5
StatePublished - Oct 2021

Bibliographical note

Publisher Copyright:
Copyright © The Korean Dermatological Association and The Korean Society for Investigative Dermatology


  • Mast cell
  • Skin inflammation
  • Toll‐like receptor 7


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