Contribution of invariant natural killer t cells to the clearance of pseudomonas aeruginosa from skin wounds

Hiromasa Tanno, Emi Kanno, Suzuna Sato, Yu Asao, Mizuki Shimono, Shiho Kurosaka, Yukari Oikawa, Shinyo Ishi, Miki Shoji, Ko Sato, Jun Kasamatsu, Tomomitsu Miyasaka, Hideki Yamamoto, Keiko Ishii, Yoshimichi Imai, Masahiro Tachi, Kazuyoshi Kawakami

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Chronic infections are considered one of the most severe problems in skin wounds, and bacteria are present in over 90% of chronic wounds. Pseudomonas aeruginosa is frequently isolated from chronic wounds and is thought to be a cause of delayed wound healing. Invariant natural killer T (iNKT) cells, unique lymphocytes with a potent regulatory ability in various inflammatory responses, accelerate the wound healing process. In the present study, we investigated the contribution of iNKT cells in the host defense against P. aeruginosa inoculation at the wound sites. We analyzed the re-epithelialization, bacterial load, accumulation of leukocytes, and production of cytokines and antimicrobial peptides. In iNKT cell–deficient (Jα18KO) mice, re-epithelialization was significantly decreased, and the number of live colonies was significantly increased, when compared with those in wild-type (WT) mice on day 7. IL-17A, and IL-22 production was significantly lower in Jα18KO mice than in WT mice on day 5. Furthermore, the administration of α-galactosylceramide (α-GalCer), a specific activator of iNKT cells, led to enhanced host protection, as shown by reduced bacterial load, and to increased production of IL-22, IL-23, and S100A9 compared that of with WT mice. These results suggest that iNKT cells promote P. aeruginosa clearance during skin wound healing.

Original languageEnglish
Article number3931
JournalInternational journal of molecular sciences
Issue number8
Publication statusPublished - 2021 Apr 2
Externally publishedYes


  • Antimicrobial peptide
  • IFN-γ
  • IL-17A
  • IL-22
  • INKT cell
  • Pseudomonas aeruginosa
  • Skin wound healing

ASJC Scopus subject areas

  • Catalysis
  • Molecular Biology
  • Spectroscopy
  • Computer Science Applications
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry


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